KR100872061B1 - Apparatus for Combining and Splitting Wavelength Band Having Four Input and Output Ports - Google Patents

Abstract

The present invention relates to a wavelength band combining and separating apparatus having four input / output terminals for bidirectional communication.

A wavelength band combining and separating device having four input / output terminals for bidirectional communication according to the present invention includes an X-band below a first wavelength and a Y above a second wavelength among wavelength bands of light transmitted through the four input / output terminals. Two wavelength division multiplexing (WDM) filters separating the bands; A WDM filter for separating the Z1-band of the third wavelength range within the X-band below the first wavelength or the Y-band above the second wavelength; And a WDM filter for separating the Z2-band of the fourth wavelength range within the X-band below the first wavelength or the Y-band above the second wavelength.

Bidirectional communication, wavelength division multiplexing (WDM) filter, wavelength band combining and separating device

Description

Apparatus for Combining and Splitting Wavelength Band Having Four Input and Output Ports}

1 is a diagram illustrating a first example of a separation band and a bidirectional communication band of a wavelength division multiplexing (WDM) filter for generally bidirectional communication.

FIG. 2 is a diagram generally illustrating a second example of a separation band and a bidirectional communication band of a WDM filter for bidirectional communication.

3 is a diagram illustrating a third example of a separation band and a bidirectional communication band of a WDM filter for generally performing bidirectional communication.

4 is a diagram illustrating a first embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

4A is a view showing a first modification of the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG.

4B is a view showing a second modification of the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG.

4C is a view showing a third modification of the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG.

5 is a view showing a second embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

5A is a view showing a first modification of the wavelength band combining and separating apparatus according to the second embodiment of the present invention shown in FIG.

5B is a view showing a second modification of the wavelength band combining and separating apparatus according to the second embodiment of the present invention shown in FIG.

5C is a view showing a third modification of the wavelength band combining and separating apparatus according to the second embodiment of the present invention shown in FIG.

FIG. 6 is a view showing a third embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

6A is a view showing a first modification of the wavelength band combining and separating apparatus according to the third embodiment of the present invention shown in FIG.

6B is a view showing a second modification of the wavelength band combining and separating apparatus according to the third embodiment of the present invention shown in FIG.

6C is a view showing a third modification of the wavelength band combining and separating apparatus according to the third embodiment of the present invention shown in FIG.

7 is a view showing a fourth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

7A is a view showing a first modification of the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention shown in FIG.

7B is a view showing a second modification of the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention shown in FIG.

7C is a view showing a third modification of the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention shown in FIG.

8 is a view showing a fifth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

8A is a view showing a first modification of the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention shown in FIG.

8B is a view showing a second modification of the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention shown in FIG.

8C is a view showing a third modification of the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention shown in FIG.

9 is a view showing a sixth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

9A is a view showing a sixth modification of the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention shown in FIG.

9B is a view showing a second modification of the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention shown in FIG.

9C is a view showing a third modification of the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention shown in FIG.

FIG. 10 illustrates a seventh embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

FIG. 10A is a view showing a first modification of the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention shown in FIG.

FIG. 10B is a view showing a second modification of the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention shown in FIG.

FIG. 10C is a view showing a third modification of the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention shown in FIG.

FIG. 11 is a view showing an eighth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

11A is a view showing a first modification of the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention shown in FIG.

FIG. 11B is a view showing a second modification of the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention shown in FIG.

11C is a view showing a third modification of the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention shown in FIG.

12 is a ninth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

12A is a view showing a first modification of the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention shown in FIG.

12B is a view showing a second modification of the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention shown in FIG.

12C is a view showing a third modification of the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention shown in FIG.

FIG. 13 shows a tenth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

FIG. 13A is a view showing a first modification of the wavelength band combining and separating apparatus according to the tenth embodiment of the present invention shown in FIG.

FIG. 13B is a view showing a second modification of the wavelength band combining and separating apparatus according to the tenth embodiment of the present invention shown in FIG.

13C is a view showing a third modification of the wavelength band combining and separating apparatus according to the tenth embodiment of the present invention shown in FIG.

14 is a view showing an eleventh embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

14A is a view showing a first modification of the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention shown in FIG.

14B is a view showing a second modification of the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention shown in FIG.

14C is a view showing a third modification of the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention shown in FIG.

FIG. 15 shows a twelfth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

15A is a view showing a first modification of the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention shown in FIG.

15B is a view showing a second modification of the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention shown in FIG.

15C is a view showing a third modification of the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention shown in FIG.

16 is a view showing a thirteenth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

16A is a view showing a first modification of the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention shown in FIG.

16B is a view showing a second modification of the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention shown in FIG.

16C is a view showing a third modification of the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention shown in FIG.

17 is a view showing a fourteenth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

17A is a view showing a first modification of the wavelength band combining and separating apparatus according to the fourteenth embodiment of the present invention shown in FIG.

FIG. 17B is a view showing a second modification of the wavelength band combining and separating apparatus according to the fourteenth embodiment of the present invention shown in FIG.

17C is a view showing a third modification of the wavelength band combining and separating apparatus according to the fourteenth embodiment of the present invention shown in FIG.

The present invention relates to a wavelength band combining and separating apparatus having four input / output terminals for bidirectional communication. More specifically, the present invention can add a wavelength band for a new bidirectional transmission and a wavelength band for a new unidirectional transmission while still accepting an existing wavelength band transmitted in both directions through a line of optical transmission lines. The present invention relates to a wavelength band combining and separating apparatus having four input / output terminals necessary for combining or separating a wavelength band into an existing transmission region.

As the use of the Internet increases and video and video services become more common, the demand for broadband services rapidly increases, increasing interest in metro / access networks connecting remote nodes and subscribers. have. Metro / subscriber networks must be easy to speed up to meet subscribers' needs for high-speed services and economical to accommodate large numbers of subscribers. Therefore, when the wavelength division multiplexing technique is applied to a metropolitan / subscriber network, an optical signal obtained by wavelength division multiplexing using multiple wavelengths can be transmitted regardless of a transmission method or speed, thereby efficiently speeding and widening a communication network. . As one of ways to expand the existing metropolitan / subscriber network, a new wavelength band may be added to the transmission region in addition to the wavelength band already used. To this end, new wavelength bands must be combined or separated in the existing transmission region, and such a combination or separation device is required.

In a conventional metropolitan / subscriber network, an add / drop multiplexer, which is a device having a function of combining and separating signals having a predetermined wavelength in a transmission band, is used. However, in order to combine the signal of the new wavelength of the prior art described above or to separate the existing signal, each add / drop multiplexer must be provided for each wavelength used, and there is a lot of installation time. There is a problem in that the cost increases because a drop multiplexer has to be used.

In addition, the prior art add / drop multiplexer has a problem that there is a certain constraint on the usability (usability) because it can combine and separate only a signal of a predetermined specific wavelength.

The present invention is to solve the above-mentioned problems of the prior art, the wavelength band for the new bidirectional transmission and the wavelength band for the new bidirectional transmission while accepting the existing wavelength band transmitted in both directions through a single optical transmission path as it is It is to provide an optical passive element required to combine or separate a new wavelength band into an existing transmission region, which can be added.

More specifically, according to the first aspect of the present invention, the present invention provides a wavelength band combining and separating apparatus having four input / output terminals for bidirectional communication, wherein the wavelength band combining and separating apparatus comprises: A first wavelength division multiplexing (WDM) filter separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light transmitted through the terminal; A second WDM filter connected to the first WDM filter and separating an X-band below the first wavelength and a Y-band above the second wavelength among wavelength bands of light transmitted through the four input / output terminals; A third WDM filter coupled to the first and second WDM filters, respectively, separating a Z1-band in a third wavelength range within a Y-band above the second wavelength; And a fourth WDM filter connected to the third WDM filter and configured to separate a Z2-band in a fourth wavelength range within the Y-band of the second wavelength or more.

According to a second aspect of the present invention, the present invention provides a wavelength band combining and separating apparatus having four input / output terminals for bidirectional communication, wherein the wavelength band combining and separating apparatus is transmitted through the four input / output terminals. A first WDM filter separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light; A second WDM filter coupled to the first WDM filter for separating a Z1-band in a third wavelength range within a Y-band above the second wavelength; A third WDM filter connected to the first and second WDM filters, respectively, for separating the Z1-band in the third wavelength range within the Y-band above the second wavelength; And a fourth WDM filter connected to the third WDM filter, the fourth WDM filter for separating the Z2-band in the fourth wavelength range within the Y-band above the second wavelength. .

According to a third aspect of the present invention, the present invention provides a wavelength band combining and separating apparatus having four input / output terminals for bidirectional communication, wherein the wavelength band combining and separating apparatus is transmitted through the four input / output terminals. A first wavelength division multiplexing (WDM) filter for separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light; A second WDM filter connected to the first WDM filter and separating an X-band below the first wavelength and a Y-band above the second wavelength among wavelength bands of light transmitted through the four input / output terminals; A third WDM filter coupled to the first and second WDM filters, respectively, for separating a Z1-band in a third wavelength range within an X-band below the first wavelength; And a fourth WDM filter connected to the third WDM filter and configured to separate a Z2-band in a fourth wavelength range within an X-band below the first wavelength. .

According to a fourth aspect of the present invention, the present invention provides a wavelength band combining and separating apparatus having four input / output terminals for bidirectional communication, wherein the wavelength band combining and separating apparatus is transmitted through the four input / output terminals. A first WDM filter separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light; A second WDM filter coupled to the first WDM filter for separating a Z1-band in a third wavelength range within an X-band below the first wavelength; A third WDM filter connected to the first and second WDM filters, respectively, for separating the Z1-band in the third wavelength range within the X-band below the first wavelength; And a fourth WDM filter connected to the third WDM filter and configured to separate a Z2-band in a fourth wavelength range within an X-band below the first wavelength. will be.

According to a fifth aspect of the present invention, the present invention provides a wavelength band combining and separating apparatus having four input / output terminals for bidirectional communication, wherein the wavelength band combining and separating apparatus is transmitted through the four input / output terminals. A first wavelength division multiplexing (WDM) filter for separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light; A second WDM filter coupled to the first WDM filter and separating a Z1-band in a third wavelength range within a Y-band above the second wavelength; A third WDM filter coupled to the second WDM filter and separating a Z2-band in a fourth wavelength range within a Y-band above the second wavelength; And a fourth WDM filter connected to the first and second WDM filters, respectively, the fourth WDM filter separating a Z3-band in a fifth wavelength range within an X-band below the first wavelength. It is to provide.

Further advantages of the present invention will become apparent from the following description with reference to the accompanying drawings in which like or like reference numerals designate like elements.

Hereinafter, the present invention will be described in detail with reference to Examples and drawings.

A wavelength band combining and separating device having four input / output terminals according to the present invention is provided with a first and second WDM filter having a function of separating the X-band and the Y-band, and the first and second WDM filters within the X-band or the Y-band. Combination of a third WDM filter with the function of separating the Z1-band, which is one subband, and a fourth WDM filter, with the function of separating the Z2-band, the second sub-band, within the X-band or Y-band. A wavelength band combining and separating device having four terminals. More specifically, in the above-described wavelength band combining and separating apparatus of the present invention, the first and second WDM filters may be edge filters, and the third and fourth WDM filters may be CWDM filters.

In addition, the wavelength band combining and separating apparatus having four input / output terminals according to the present invention has a first WDM filter having a function of separating the X-band and the Y-band, the first within the X-band or the Y-band. Second and third WDM filters having a function of separating the subbands Z1-band, and a fourth WDM filter having a function of separating the second subbands Z2-band within the X-band or the Y-band. A wavelength band combining and separating device having four terminals consisting of a combination of two. More specifically, in the above-described wavelength band combining and separating apparatus of the present invention, the first WDM filter may be an edge filter, and the second to fourth WDM filters may be CWDM filters.

Furthermore, the wavelength band combining and separating apparatus having four input / output terminals according to the present invention includes a first WDM filter having a function of separating the X-band and the Y-band, and Z1, which is the first subband in the Y-band. A second WDM filter with the function of separating the bands, a third WDM filter with the function of separating the Z2-band, the second subband in the Y-band, and Z3, a third subband in the X-band. A wavelength band combining and separating device having four terminals consisting of a combination of a fourth WDM filter with the function of separating the bands. More specifically, in the above-described wavelength band combining and separating apparatus of the present invention, the first WDM filter may be an edge filter, and the second to fourth WDM filters may be CWDM filters, respectively.

The wavelength band combining and separating apparatus having four input / output terminals according to the present invention described above includes at least four bands (X-band; Z1-band, Z2-band; and Y1-band, Y2-band, and Y3-band. At least two bands, or Y-bands; Z1-band, Z2-band; and X1-band, X2-band, and X3-band increment at least two bands).

First, FIG. 1 is a diagram generally illustrating a first example of a separation band and a bidirectional communication band of a WDM filter for bidirectional communication, and FIG. 2 is a diagram of a separation band and bidirectional communication of a WDM filter for bidirectional communication. FIG. 3 is a diagram illustrating a second example of a band, and FIG. 3 is a diagram illustrating a third example of a separation band and a bidirectional communication band of a WDM filter for generally performing bidirectional communication.

Referring to FIG. 1, in a separate band and a bidirectional communication band of a WDM filter for bidirectional communication in four bands, bidirectional communication is performed using X-bands and Z-bands (Z1 and Z2-bands). A case in which bidirectional communication is performed by dividing a band into two bands (that is, two bands of the Y1-band, the Y2-band, and the Y3-band) is illustrated. In addition, referring to FIG. 2, in the separate band and the bidirectional communication band of the WDM filter for bidirectional communication in four bands, bidirectional communication is performed using the Y-band and the Z-band (Z1 and Z2-bands). The case where bidirectional communication is performed by dividing the X-band into two bands (ie, two of the X1-band, the X2-band, and the X3-band) is shown. In addition, referring to FIG. 3, in the separate band and the bidirectional communication band of the WDM filter for bidirectional communication in four bands, bidirectional communication is performed using the Z3-band, Z1, and Z2-band, and the X-band and Y. The case of bidirectional communication using at least two bands in the X1-band, the X2-band, the Y1-band, and the Y-2 band in the band is shown. In the bidirectional communication of FIGS. 1 to 3 described above, the wavelength pass and reflection characteristics of the WDM filter may vary depending on the band of the bidirectional communication to be used. In addition, the edge filter is used as the first and second WDM filters having a function of separating the X-band and the Y-band among the WDM filters used in the bidirectional communication of FIGS. 1 and 2 described above. CWDM filters are used as the third and fourth WDM filters, each having the function of separating the Z-band, which is a detailed band within the Y-band. In addition, the edge filter is used as the first WDM filter having a function of separating the X-band and the Y-band among the WDM filters used in the bidirectional communication of FIGS. 1 and 2 described above. The first to third CWDM filters are used as the second to fourth WDM filters having a function of separating the Z-band, which is a detailed band in. In addition, the edge filter is used as the first WDM filter having a function of separating the X-band and the Y-band among the WDM filters used in the bidirectional communication of FIG. 3, and the Z-band, which is a detailed band within the Y-band. The CWDM filter is used as the second and third WDM filters each having a function of separating the CWDM filter, and the CWDM filter is used as the fourth WDM filter having the function of separating the Z-band which is a detailed band within the X-band.

4 is a diagram illustrating a first embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 4, the wavelength band combining and separating apparatus according to the first embodiment of the present invention includes two first edge filters and a second edge filter for separating the X-band and the Y-band among the wavelength bands of transmitted light; And a combination of a first CWDM filter for separating the Z1-band within the Y-band and a second CWDM filter for separating the Z2-band within the Y-band. In the first embodiment of the present invention shown in FIG. 4, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical subscriber network (TDM-PON), is X-band, and is larger than 1415 nm. The downlink signal in the wavelength band in the range of 1480 to 1500 nm of the Y-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1550 ~ 1560 nm of the Y-band is used as the Z2-band. These bands are standardized bands in the International Telecommunications Union-Telecommunication Standardization Sector (ITU-T).

More specifically, the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG. 4 includes a first band separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more among the wavelength bands of transmitted light. Edge filters; A second edge filter separating the X-band of 1360 nm or less and the Y-band of 1415 nm or more of the wavelength band of the transmitted light; And a first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more. And a second CWDM filter for separating the Z2-band in the range of 1550-1560 nm within the Y-band of 1415 nm or more. In the first embodiment of the present invention, a reflection port of the first edge filter is connected to the reflection terminal of the first CWDM filter, and a pass port of the first edge filter is connected to the second edge filter. It is connected to the pass terminal. The reflective terminal of the second edge filter is connected to a common port of the first CWDM filter. The pass terminal of the first CWDM filter is connected to the common terminal of the second CWDM filter. At this time, the first and second edge filters are the pass terminal of the signal of 1360 nm or less wavelength band (X-band) of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more is It acts as a separating terminal for reflection. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. The second CWDM filter outputs a signal in the wavelength band (Z2-band) in the range of 1550 to 1560 nm to the reflection terminal, and outputs the signal in the remaining wavelength band to the pass terminal. The first and second edge filters and the first and second CWDM filters used in FIG. 4 both have reversible characteristics as passive elements. Thus, the Z1-band signal in the range of 1480 to 1500 nm is transmitted along path ①, the Z2-band signal in the 1550 to 1560 nm range is transmitted along path ④, and the X-band signal of 1360 nm or less is number ②. It can be routed and used as a bidirectional communication band with Z-band signals. In general, in the WDM filter, since the insertion loss of the reflective terminal is smaller than that of the pass terminal, the Z1-band signal in the range of 1480 to 1500 nm is passed through the reflective terminal. The movement path of two bands of Y1-band, Y2-band, and Y3-band, which can be used as another bidirectional communication band, is as follows. In this case, the Y1-band is defined by 1415-1470 nm, the Y2-band is 1510-1540 nm, and the Y3-band is defined by a wavelength range of 1570 nm or more. Here, the guard band is assumed to be 10 nm to separate between the Y-band and the Z-band. This guard band can be changed depending on the characteristics of the filter. Therefore, the existing bidirectional signal is inputted and outputted at terminal 1 of the wavelength band combining and separating apparatus of the present invention having four input and output terminals as shown in FIG. 4, and the newly added bidirectional signal is inputted and outputted at terminal 3. Terminal 2 inputs and outputs both existing bidirectional signals and newly added bidirectional signals. Terminal 4 inputs and outputs newly added one-way signals. In addition, since the first and second edge filters and the first and second CWDM filters shown in FIG. 4 are passive elements having reversible characteristics, those skilled in the art will appreciate that the Z1-band signal in the range of 1480 to 1500 nm is the reverse direction of the ① path. X-band signal of 1360 nm or less is transmitted along the reverse direction of path ② and used as a bidirectional communication band, and is a moving path of two bands of Y1-band and Y2-band and Y3-band. Is transmitted along the reverse direction of path ③, and it will be understood that Z2-band signals in the range of 1550-1560 nm can be transmitted along the reverse direction of path ④.

4A is a view showing a first modification of the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the first embodiment shown in FIG. 4A may be implemented by the first CWDM filter and the second CWDM filter respectively in the wavelength band combining and separating apparatus shown in FIG. 4. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter outputs a signal in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs the signal in the remaining wavelength band to the reflective terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

4B is a view showing a second modification of the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the first embodiment shown in FIG. 4B may be used for the first edge filter and the second edge filter in the wavelength band combining and separating apparatus shown in FIG. 4, respectively. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals.

4C is a view showing a third modification of the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the first embodiment shown in FIG. 4C includes the first edge filter, the second edge filter, and the first edge filter in the wavelength band combining and separating apparatus shown in FIG. 4. The pass and reflection terminals of the first CWDM filter and the second CWDM filter are changed from each other so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs signals in the remaining wavelength band to the reflective terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

5 is a view showing a second embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 5, the wavelength band combining and separating apparatus according to the second embodiment of the present invention includes a first edge filter for separating the X-band and the Y-band among the wavelength bands of the transmitted light, and Z1-Z within the Y-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the Y-band. In the second embodiment of the present invention shown in FIG. 5, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, and has 1415 nm or more. The downlink signal in the wavelength band in the range of 1480 to 1500 nm of the Y-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1550 ~ 1560 nm of the Y-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the second embodiment of the present invention shown in FIG. 5 includes a first band separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more among the wavelength bands of transmitted light. Edge filters; And a first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more. A second CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more; And a third CWDM filter for separating the Z2-band in the range of 1550-1560 nm within the Y-band of 1415 nm or more. In the second embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the reflecting terminal of the first edge filter is connected to the common terminal of the second CWDM filter. The reflective terminal of the second CWDM filter is connected to the reflective terminal of the first CWDM filter. The pass terminal of the second CWDM filter is connected to the common terminal of the third CWDM filter. At this time, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as pass terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the reflective terminals. It plays a role. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1550-1560 nm to the reflection terminal, and outputs the signals in the remaining wavelength band to the pass terminal. Referring to FIG. 5, the wavelength band combining and separating apparatus according to the second embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the first embodiment of the present invention illustrated in FIG. 4. .

5A is a view showing a first modification of the wavelength band combining and separating apparatus according to the second embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the first modification of the second embodiment shown in FIG. 5A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating device shown in FIG. 5. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480-1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

5B is a view showing a second modification of the wavelength band combining and separating apparatus according to the second embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the second embodiment shown in FIG. 5B is characterized in that the pass terminal and the reflective terminal of the first edge filter in the wavelength band combining and separating device shown in FIG. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflection terminal and the reflection terminal is changed to the pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

5C is a view showing a third modification of the wavelength band combining and separating apparatus according to the second embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the second embodiment shown in FIG. 5C includes a first edge filter, and first to third in the wavelength band combining and separating apparatus shown in FIG. 5. The pass terminals and the reflective terminals of the CWDM filters are interchanged with each other so that the pass terminals are changed to the reflective terminals and the reflective terminals are changed to the pass terminals. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 6 is a view showing a third embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 6, the wavelength band combining and splitting apparatus according to the third embodiment of the present invention includes a first edge filter for separating the X-band and the Y-band among the wavelength bands of the transmitted light, and the Z1-band within the Y-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the Y-band. In the third embodiment of the present invention shown in FIG. 6, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, and has 1415 nm or more. The downlink signal in the wavelength band in the range of 1480 to 1500 nm of the Y-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1550 ~ 1560 nm of the Y-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the third embodiment of the present invention shown in FIG. 6 includes a first band separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more among the wavelength bands of transmitted light. Edge filters; And a first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more. A second CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more; And a third CWDM filter for separating the Z2-band in the range of 1550-1560 nm within the Y-band of 1415 nm or more. In the third embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the common terminal of the first edge filter is connected to the pass terminal of the second CWDM filter. The reflective terminal of the second CWDM filter is connected to the reflective terminal of the first CWDM filter. The reflective terminal of the first edge filter is connected to the common terminal of the third CWDM filter. At this time, the first edge filter is a signal of 1360 nm or less wavelength band (X-band) as a pass terminal, and a signal of 1415 nm or more wavelength band (Y-band) is a reflection terminal among the signals input to the common terminal. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1550-1560 nm to the reflection terminal, and outputs the signals in the remaining wavelength band to the pass terminal. Referring to FIG. 6, the wavelength band combining and separating apparatus according to the third embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the first embodiment of the present invention illustrated in FIG. 4. .

6A is a view showing a first modification of the wavelength band combining and separating apparatus according to the third embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the third embodiment shown in FIG. 6A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating apparatus shown in FIG. 6. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480-1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

6B is a view showing a second modification of the wavelength band combining and separating apparatus according to the third embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the third embodiment shown in FIG. 6B is a device for the pass terminal and the reflective terminal of the first edge filter in the wavelength band combining and separating device shown in FIG. 6. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

6C is a view showing a third modification of the wavelength band combining and separating apparatus according to the third embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the third embodiment shown in FIG. 6C includes a first edge filter, and first to third in the wavelength band combining and separating apparatus shown in FIG. 6. The pass terminals and the reflective terminals of the CWDM filters are interchanged with each other so that the pass terminals are changed to the reflective terminals and the reflective terminals are changed to the pass terminals. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

7 is a view showing a fourth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 7, the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention includes two first edge filters and a second edge filter for separating the X-band and the Y-band among the wavelength bands of transmitted light; And a combination of a first CWDM filter for separating the Z1-band within the Y-band and a second CWDM filter for separating the Z2-band within the Y-band. In the fourth embodiment of the present invention shown in FIG. 7, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, and has 1415 nm or more. The downlink signal in the wavelength band in the range of 1480 to 1500 nm of the Y-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1550 ~ 1560 nm of the Y-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention shown in FIG. 7 includes a first band separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more among the wavelength bands of transmitted light. Edge filters; A second edge filter separating the X-band of 1360 nm or less and the Y-band of 1415 nm or more of the wavelength band of the transmitted light; And a first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more. And a second CWDM filter for separating the Z2-band in the range of 1550-1560 nm within the Y-band of 1415 nm or more. In the fourth embodiment of the present invention, a reflection port of the first edge filter is connected to the reflection terminal of the first CWDM filter, and a pass port of the first edge filter is connected to the second edge filter. It is connected to the pass terminal. The reflective terminal of the second edge filter is connected to a common port of the second CWDM filter. The common terminal of the first CWDM filter is connected to the pass terminal of the second CWDM filter. At this time, the first and second edge filters are the pass terminal of the signal of 1360 nm or less wavelength band (X-band) of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more is It acts as a separating terminal for reflection. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. The second CWDM filter outputs a signal in the wavelength band (Z2-band) in the range of 1550 to 1560 nm to the reflection terminal, and outputs the signal in the remaining wavelength band to the pass terminal. Referring to FIG. 7, the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG. .

7A is a view showing a first modification of the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the fourth embodiment shown in FIG. 7A may be implemented by the first CWDM filter and the second CWDM filter in the wavelength band combining and separating apparatus shown in FIG. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter outputs a signal in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs the signal in the remaining wavelength band to the reflective terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

7B is a view showing a second modification of the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the fourth embodiment shown in FIG. 7B may be configured as the first edge filter and the second edge filter in the wavelength band combining and separating apparatus shown in FIG. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals.

7C is a view showing a third modification of the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the fourth embodiment illustrated in FIG. 7C may include the first edge filter, the second edge filter, and the first edge filter in the wavelength band combining and separating apparatus illustrated in FIG. 7. The pass and reflection terminals of the first CWDM filter and the second CWDM filter are changed from each other so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs signals in the remaining wavelength band to the reflective terminal. In addition, the second CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1550 to 1560 nm to the pass terminal, and outputs signals in the remaining wavelength band to the reflective terminal.

8 is a view showing a fifth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 8, the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention includes a first edge filter that separates an X-band and a Y-band among wavelength bands of transmitted light, and a Z1-band within the Y-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the Y-band. In the fifth embodiment of the present invention shown in FIG. 8, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, and has 1415 nm or more. The downlink signal in the wavelength band in the range of 1480 to 1500 nm of the Y-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1550 ~ 1560 nm of the Y-band is used as the Z2-band.

More specifically, the wavelength band combining and splitting apparatus according to the fifth embodiment of the present invention shown in FIG. 8 includes a first band separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more among the wavelength bands of transmitted light. Edge filters; And a first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more. A second CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more; And a third CWDM filter for separating the Z2-band in the range of 1550-1560 nm within the Y-band of 1415 nm or more. In the fifth embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the reflecting terminal of the first edge filter is connected to the common terminal of the third CWDM filter. The reflective terminal of the second CWDM filter is connected to the reflective terminal of the first CWDM filter. The common terminal of the second CWDM filter is connected to the pass terminal of the third CWDM filter. At this time, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as pass terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the reflective terminals. It plays a role. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1550-1560 nm to the reflection terminal, and outputs the signals in the remaining wavelength band to the pass terminal. Referring to FIG. 8, the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the first embodiment of the present invention illustrated in FIG. 4. .

8A is a view showing a first modification of the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the fifth embodiment shown in FIG. 8A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating apparatus shown in FIG. 8. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480-1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in the wavelength band (Z2-band) in the range of 1550-1560 nm to the pass terminal, and outputs the signal in the remaining wavelength band to the reflective terminal.

8B is a view showing a second modification of the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the fifth embodiment shown in FIG. 8B is a device for the pass and reflection terminals of the first edge filter in the wavelength band combining and separating device shown in FIG. 8. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

8C is a view showing a third modification of the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the fifth embodiment shown in FIG. 8C includes a first edge filter, first to third CWDM filters in the wavelength band combining and separating apparatus shown in FIG. 8. The function of each pass-through terminal and the reflective terminal is changed from one another to illustrate the case where the pass-through terminal is changed to the reflective terminal and the reflective terminal is changed to the pass-through terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

9 is a view showing a sixth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 9, the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention includes a first edge filter that separates an X-band and a Y-band among wavelength bands of transmitted light, and Z1-in the Y-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the Y-band. In the sixth embodiment of the present invention shown in FIG. 9, the uplink signal in the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, and has 1415 nm or more. The downlink signal in the wavelength band in the range of 1480 to 1500 nm of the Y-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1550 ~ 1560 nm of the Y-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention shown in FIG. 9 includes a first band separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more among wavelength bands of transmitted light. Edge filters; And a first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more. A second CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more; And a third CWDM filter for separating the Z2-band in the range of 1550-1560 nm within the Y-band of 1415 nm or more. In the sixth embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the common terminal of the first edge filter is connected to the pass terminal of the third CWDM filter. The reflective terminal of the first CWDM filter is connected to the reflective terminal of the second CWDM filter. The pass terminal of the second CWDM filter is connected to the common terminal of the third CWDM filter. At this time, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as pass terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the reflective terminals. It plays a role. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1550-1560 nm to the reflection terminal, and outputs the signals in the remaining wavelength band to the pass terminal. Referring to FIG. 9, the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIG. .

9A is a view showing a first modification of the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the sixth embodiment shown in FIG. 9A includes a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating apparatus shown in FIG. The function of the reflective terminals is interchanged so that the pass terminal is changed to the reflective terminal and the reflecting terminal is changed to the pass terminal. In this case, the first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480-1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

9B is a view showing a second modification of the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the sixth embodiment shown in FIG. 9B is characterized in that the pass and reflection terminals of the first edge filter in the wavelength band combining and separating device shown in FIG. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflection terminal and the reflection terminal is changed to the pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

9C is a view showing a third modification of the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the sixth embodiment shown in FIG. 9C includes a first edge filter and a first to third CWDM filter in the wavelength band combining and separating apparatus shown in FIG. 9. The function of each pass-through terminal and the reflective terminal is changed from one another to illustrate the case where the pass-through terminal is changed to the reflective terminal and the reflective terminal is changed to the pass-through terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 10 illustrates a seventh embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 10, a wavelength band combining and separating apparatus according to a seventh embodiment of the present invention includes two first edge filters and a second edge filter for separating an X-band and a Y-band among wavelength bands of transmitted light; It consists of a combination of a first CWDM filter for separating the Z1-band within the X-band and a second CWDM filter for separating the Z2-band within the X-band. In the seventh embodiment of the present invention shown in FIG. 10, the uplink signal of the wavelength band in the range of 1260-1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, 1360 nm or less. The downlink signal in the wavelength band in the range of 1300 to 1320 nm of the X-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1260 ~ 1280 nm range of the X-band is used as the Z2-band. In this case, the ranges of the Z1 and Z2 bands are exemplary and may be changed according to the purpose of use, and the scope of the present invention is not limited thereto.

More specifically, the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention shown in FIG. 10 is configured to separate the X-band of 1360 nm or less and the Y-band of 1415 nm or more among the wavelength bands of transmitted light. 1 edge filter; A second edge filter separating the X-band of 1360 nm or less and the Y-band of 1415 nm or more of the wavelength band of the transmitted light; A first CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; And a second CWDM filter separating the Z2-band in the range of 1260 to 1280 nm within the X-band of 1360 nm or less. In the seventh embodiment of the present invention, a reflection port of the first edge filter is connected to the reflection terminal of the first CWDM filter, and a pass port of the first edge filter is connected to the second edge filter. It is connected to the pass terminal. The reflective terminal of the second edge filter is connected to a common port of the first CWDM filter. The pass terminal of the first CWDM filter is connected to the common terminal of the second CWDM filter. At this time, the first and second edge filters are the pass terminal of the signal of 1360 nm or less wavelength band (X-band) of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more is It acts as a separating terminal for reflection. The first CWDM filter outputs a signal in a wavelength band (Z1-band) in a range of 1300 to 1320 nm to a reflection terminal, and outputs a signal in the remaining wavelength band to a pass terminal. The second CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1260 to 1280 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. The first and second edge filters and the first and second CWDM filters used in FIG. 10 all have reversible characteristics as passive elements. Therefore, the Z1-band signal in the range of 1300 to 1320 nm is transmitted along the path ①, the Z2-band signal in the range 1260 to 1280 nm is transmitted along the path ④, and the Y-band signal of more than 1415m is routed to the ②. It can be used as a bi-directional communication band with Z-band signal. In general, in the WDM filter, since the insertion loss of the reflective terminal is smaller than that of the pass terminal, the Z1-band signal in the range of 1300 to 1320 nm passes through the reflective terminal. The movement path of two bands of X1-band, X2-band and X3-band which can be used as another bidirectional communication band is as follows. In this case, the X1-band is defined as a wavelength range of 1320 ~ 1360 nm, the X2-band is 1280 ~ 1300 nm, the X3-band is 1260 nm or less. Accordingly, the existing bidirectional signal is inputted and outputted at terminal 1 of the wavelength band combining and separating apparatus of the present invention having four input / output terminals as shown in FIG. 10, and the newly added bidirectional signal is inputted and outputted at terminal 3. Terminal 2 inputs and outputs both existing bidirectional signals and newly added bidirectional signals. Terminal 4 inputs and outputs newly added one-way signals. In addition, since the first and second edge filters and the first and second CWDM filters shown in FIG. 10 are passive elements having reversible characteristics, those skilled in the art will appreciate that the Z1-band signal in the range of 1300 to 1320 nm is reversed in the path ①. The Y-band signal of 1415 nm or more is transmitted along the reverse direction of path ② to be used as a bidirectional communication band, and the moving path of two bands of X1-band and X2-band and X3-band is ③ It will be appreciated that it can be carried along the reverse of the burn path.

FIG. 10A is a view showing a first modification of the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the seventh embodiment shown in FIG. 10A may be implemented by the first CWDM filter and the second CWDM filter, respectively, in the wavelength band combining and separating apparatus shown in FIG. 10. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and outputs signals in the remaining wavelength band to the reflective terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 10B is a view showing a second modification of the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the seventh embodiment shown in FIG. 10B may include the first edge filter and the second edge filter, respectively, in the wavelength band combining and separating apparatus shown in FIG. 10. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals.

FIG. 10C is a view showing a third modification of the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the seventh embodiment shown in FIG. 10C includes the first edge filter, the second edge filter and the first edge filter in the wavelength band combining and separating apparatus shown in FIG. 10. The case where the functions of the pass terminal and the reflecting terminal of each of the first CWDM filter and the second CWDM filter are changed is illustrated, and the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals. The first CWDM filter outputs a signal in a wavelength band (Z1-band) in a range of 1300 to 1320 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 11 is a view showing an eighth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 11, a wavelength band combining and separating apparatus according to an eighth embodiment of the present invention includes a first edge filter for separating an X-band and a Y-band among wavelength bands of transmitted light, and Z1-band within the X-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the X-band. In the eighth embodiment of the present invention shown in FIG. 11, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, 1360 nm or less. The downlink signal in the wavelength band in the range of 1300 to 1320 nm of the X-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1260 ~ 1280 nm range of the X-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention shown in FIG. 11 is configured to separate the X-band of 1360 nm or less and the Y-band of 1415 nm or more among the wavelength bands of transmitted light. 1 edge filter; A first CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; A second CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; And a third CWDM filter separating the Z2-band in the range of 1260 to 1280 nm within the X-band of 1360 nm or less. In the eighth embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the reflecting terminal of the first edge filter is connected to the common terminal of the second CWDM filter. The reflective terminal of the second CWDM filter is connected to the reflective terminal of the first CWDM filter. The pass terminal of the second CWDM filter is connected to the common terminal of the third CWDM filter. At this time, the first edge filter is a signal in the wavelength band (X-band) of 1360 nm or less of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more to the reflection terminal. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1260 to 1280 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. Referring to FIG. 11, the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the seventh embodiment of the present invention illustrated in FIG. 10. .

11A is a view showing a first modification of the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the first modification of the eighth embodiment shown in FIG. 11A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating device shown in FIG. 11. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter and the second CWDM filter output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 11B is a view showing a second modification of the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the eighth embodiment shown in FIG. 11B is a device for the pass and reflection terminals of the first edge filter in the wavelength band combining and separating device shown in FIG. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflection terminal and the reflection terminal is changed to the pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

11C is a view showing a third modification of the wavelength band combining and separating apparatus according to the eighth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the eighth embodiment shown in FIG. 11C may include the first edge filter, the first CWDM filter to the first wavelength filter in the wavelength band combining and separating apparatus shown in FIG. 11. 3 illustrates the case where the pass terminal and the reflecting terminal of each of the CWDM filters are switched to each other so that the pass terminal is changed to the reflecting terminal and the reflecting terminal to the pass terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

12 is a ninth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 12, the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention includes a first edge filter that separates an X-band and a Y-band among wavelength bands of transmitted light, and Z1-band in the X-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the X-band. In the ninth embodiment of the present invention shown in FIG. 12, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, 1360 nm or less. The downlink signal in the wavelength band in the range of 1300 to 1320 nm of the X-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1260 ~ 1280 nm range of the X-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention shown in FIG. 12 is configured to separate the X-band of 1360 nm or less and the Y-band of 1415 nm or more among the wavelength bands of transmitted light. 1 edge filter; A first CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; A second CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; And a third CWDM filter separating the Z2-band in the range of 1260 to 1280 nm within the X-band of 1360 nm or less. In the ninth embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the common terminal of the first edge filter is connected to the pass terminal of the second CWDM filter. The reflective terminal of the first CWDM filter is connected to the reflective terminal of the second CWDM filter. The reflective terminal of the first edge filter is connected to the common terminal of the third CWDM filter. At this time, the first edge filter is a signal in the wavelength band (X-band) of 1360 nm or less of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more to the reflection terminal. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1260 to 1280 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. Referring to FIG. 12, the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the seventh exemplary embodiment of the present invention illustrated in FIG. 10. .

12A is a view showing a first modification of the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the first modification of the ninth embodiment shown in FIG. 12A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating device shown in FIG. 12. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter and the second CWDM filter output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

12B is a view showing a second modification of the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the ninth embodiment shown in FIG. 12B is characterized in that the pass terminal and the reflective terminal of the first edge filter in the wavelength band combining and separating device shown in FIG. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflection terminal and the reflection terminal is changed to the pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

12C is a view showing a third modification of the wavelength band combining and separating apparatus according to the ninth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the ninth embodiment shown in FIG. 12C includes a first edge filter and a first CWDM filter in the wavelength band combining and separating apparatus shown in FIG. 12. The case where the function of the pass terminal and the reflecting terminal of each of the third CWDM filters is changed is illustrated, and the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 13 shows a tenth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 13, a wavelength band combining and separating apparatus according to a tenth embodiment of the present invention includes two first edge filters and a second edge filter for separating an X-band and a Y-band among wavelength bands of transmitted light; It consists of a combination of a first CWDM filter for separating the Z1-band within the X-band and a second CWDM filter for separating the Z2-band within the X-band. In the tenth embodiment of the present invention shown in FIG. 13, the uplink signal in the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, 1360 nm or less. The downlink signal in the wavelength band in the range of 1300 to 1320 nm of the X-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1260 ~ 1280 nm range of the X-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the tenth embodiment of the present invention shown in FIG. 13 is an agent that separates the X-band of 1360 nm or less and the Y-band of 1415 nm or more among the wavelength bands of transmitted light. 1 edge filter; A second edge filter separating the X-band of 1360 nm or less and the Y-band of 1415 nm or more of the wavelength band of the transmitted light; A first CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; And a second CWDM filter separating the Z2-band in the range of 1260 to 1280 nm within the X-band of 1360 nm or less. In a tenth embodiment of the present invention, a reflection port of the first edge filter is connected to the reflection terminal of the first CWDM filter, and a pass port of the first edge filter is connected to the second edge filter. It is connected to the pass terminal. The reflective terminal of the second edge filter is connected to a common port of the second CWDM filter. At this time, the first and second edge filters are the pass terminal of the signal of 1360 nm or less wavelength band (X-band) of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more is It acts as a separating terminal for reflection. The first CWDM filter outputs a signal in a wavelength band (Z1-band) in a range of 1300 to 1320 nm to a reflection terminal, and outputs a signal in the remaining wavelength band to a pass terminal. The second CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1260 to 1280 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. The first and second edge filters and the first and second CWDM filters used in FIG. 13 all have reversible characteristics as passive elements. Therefore, the Z1-band signal in the range of 1300 to 1320 nm is transmitted along the path ①, the Z2-band signal in the range 1260 to 1280 nm is transmitted along the path ④, and the Y-band signal of more than 1415m is routed to the ②. Can be used as a bi-directional communication band with Z-band signals. In general, in the WDM filter, since the insertion loss of the reflective terminal is smaller than that of the pass terminal, the Z1-band signal in the range of 1300 to 1320 nm passes through the reflective terminal. The movement path of two bands of X1-band, X2-band and X3-band which can be used as another bidirectional communication band is as follows. In this case, the X1-band is defined as a wavelength range of 1320 ~ 1360 nm, the X2-band is 1280 ~ 1300 nm, the X3-band is 1260 nm or less. Accordingly, the existing bidirectional signal is inputted and outputted at terminal 1 of the wavelength band combining and separating apparatus of the present invention having four input / output terminals as shown in FIG. 13, and the newly added bidirectional signal is inputted and outputted at terminal 3. Terminal 2 inputs and outputs both existing bidirectional signals and newly added bidirectional signals. Terminal 4 inputs and outputs newly added one-way signals. In addition, since the first and second edge filters and the first and second CWDM filters shown in FIG. 13 are passive elements having reversible characteristics, those skilled in the art will appreciate that the Z1-band signal in the range of 1300 to 1320 nm is reversed in the path ①. The Y-band signal of 1415 nm or more is transmitted along the reverse direction of path ② to be used as a bidirectional communication band, and the moving path of two bands of X1-band and X2-band and X3-band is ③ It will be appreciated that it can be carried along the reverse of the burn path.

FIG. 13A is a view showing a first modification of the wavelength band combining and separating apparatus according to the tenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the tenth embodiment shown in FIG. 13A may include the first CWDM filter and the second CWDM filter, respectively, in the wavelength band combining and separating apparatus illustrated in FIG. 13. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and outputs signals in the remaining wavelength band to the reflective terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 13B is a view showing a second modification of the wavelength band combining and separating apparatus according to the tenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the tenth embodiment shown in FIG. 13B may include the first edge filter and the second edge filter, respectively, in the wavelength band combining and separating apparatus shown in FIG. 13. The case where the pass terminal and the reflecting terminal are interchanged with each other illustrates a case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals.

13C is a view showing a third modification of the wavelength band combining and separating apparatus according to the tenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the tenth embodiment illustrated in FIG. 13C may include the first edge filter, the second edge filter, and the first edge filter in the wavelength band combining and separating apparatus illustrated in FIG. 13. The pass and reflection terminals of the first CWDM filter and the second CWDM filter are changed from each other so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filter and the second edge filter are signals of a wavelength band (X-band) of 1360 nm or less among the signals input to the common terminal, respectively, as reflection terminals, and each of the wavelength band (Y-band) of 1415 nm or more. The signal serves to separate into the pass terminals. The first CWDM filter outputs a signal in a wavelength band (Z1-band) in a range of 1300 to 1320 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal. In addition, the second CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

14 is a view showing an eleventh embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 14, a wavelength band combining and separating apparatus according to an eleventh embodiment of the present invention includes a first edge filter for separating an X-band and a Y-band among wavelength bands of transmitted light, and a Z1-band within the X-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the X-band. In the eleventh embodiment of the present invention shown in FIG. 14, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical subscriber network (TDM-PON), is Y-band, 1360 nm or less. The downlink signal in the wavelength band in the range of 1300 to 1320 nm of the X-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1260 ~ 1280 nm range of the X-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention shown in FIG. 14 is configured to separate the X-band of 1360 nm or less and the Y-band of 1415 nm or more among the wavelength bands of transmitted light. 1 edge filter; A first CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; A second CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; And a third CWDM filter separating the Z2-band in the range of 1260 to 1280 nm within the X-band of 1360 nm or less. In the eleventh embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the reflecting terminal of the first edge filter is connected to the common terminal of the third CWDM filter. The reflective terminal of the second CWDM filter is connected to the reflective terminal of the first CWDM filter. The common terminal of the second CWDM filter is connected to the pass terminal of the third CWDM filter. At this time, the first edge filter is a signal in the wavelength band (X-band) of 1360 nm or less of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more to the reflection terminal. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1260 to 1280 nm to the reflection terminal, and outputs the signals in the remaining wavelength band to the pass terminal. Referring to FIG. 14, the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the seventh exemplary embodiment of the present invention illustrated in FIG. 10. .

14A is a view showing a first modification of the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the eleventh embodiment shown in FIG. 14A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating apparatus shown in FIG. 14. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter and the second CWDM filter output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

14B is a view showing a second modification of the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the eleventh embodiment shown in FIG. 14B is characterized in that the pass terminal and the reflective terminal of the first edge filter in the wavelength band combining and separating device shown in FIG. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

14C is a view showing a third modification of the wavelength band combining and separating apparatus according to the eleventh embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the eleventh embodiment illustrated in FIG. 14C may include the first edge filter, the first CWDM filter to the first wavelength filter in the wavelength band combining and separating apparatus illustrated in FIG. 14. 3 illustrates the case where the pass terminal and the reflecting terminal of each of the CWDM filters are switched to each other so that the pass terminal is changed to the reflecting terminal and the reflecting terminal to the pass terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

FIG. 15 shows a twelfth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 15, a wavelength band combining and separating apparatus according to a twelfth embodiment of the present invention includes a first edge filter for separating an X-band and a Y-band among wavelength bands of transmitted light, and a Z1-band within the X-band. A combination of a first CWDM filter and a second CWDM filter for separating the band and a third CWDM filter for separating the Z2-band within the X-band. In the twelfth embodiment of the present invention shown in FIG. 15, the uplink signal of the wavelength band in the range of 1260 to 1360 nm, which is already standardized in the time division multiplexing passive optical network (TDM-PON), is X-band, 1360 nm or less. The downlink signal in the wavelength band in the range of 1300 to 1320 nm of the X-band is used as the Z1-band. At this time, the downlink signal in the wavelength band of 1260 ~ 1280 nm range of the X-band is used as the Z2-band.

More specifically, the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention shown in FIG. 15 is configured to separate the X-band of 1360 nm or less and the Y-band of 1415 nm or more among the wavelength bands of transmitted light. 1 edge filter; A first CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; A second CWDM filter separating the Z1-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less; And a third CWDM filter separating the Z2-band in the range of 1260 to 1280 nm within the X-band of 1360 nm or less. In the twelfth embodiment of the present invention, the pass terminal of the first edge filter is connected to the pass terminal of the first CWDM filter, and the common terminal of the first edge filter is connected to the pass terminal of the third CWDM filter. The reflective terminal of the first CWDM filter is connected to the reflective terminal of the second CWDM filter. The pass terminal of the second CWDM filter is connected to the common terminal of the third CWDM filter. At this time, the first edge filter is a signal in the wavelength band (X-band) of 1360 nm or less of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more to the reflection terminal. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the reflection terminal, and output signals in the remaining wavelength band to the pass terminal. The third CWDM filter outputs signals in the wavelength band (Z2-band) in the range of 1260 to 1280 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. Referring to FIG. 15, the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the seventh exemplary embodiment of the present invention illustrated in FIG. 10. .

15A is a view showing a first modification of the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the twelfth embodiment shown in FIG. 15A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating apparatus shown in FIG. 15. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter and the second CWDM filter output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflecting terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

15B is a view showing a second modification of the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the twelfth embodiment shown in FIG. 15B is provided in the wavelength band combining and separating device shown in FIG. 15. The functions are interchanged so that the pass terminal is a reflection terminal and the reflection terminal is a pass terminal. In this case, the first edge filter separates signals in the wavelength band (X-band) of 1360 nm or less from the signals input to the common terminal as reflection terminals and signals in the wavelength band (Y-band) of 1415 nm or more into the pass terminals. It plays a role.

15C is a view showing a third modification of the wavelength band combining and separating apparatus according to the twelfth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the twelfth embodiment shown in FIG. 15C may include the first edge filter, the first CWDM filter to the first wavelength filter in the wavelength band combining and separating apparatus shown in FIG. 15. 3 illustrates the case where the pass terminal and the reflecting terminal of each of the CWDM filters are switched to each other so that the pass terminal is changed to the reflecting terminal and the reflecting terminal to the pass terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first and second CWDM filters output signals in the wavelength band (Z1-band) in the range of 1300 to 1320 nm to the pass terminal, and output signals in the remaining wavelength band to the reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z2-band) in the range of 1260 to 1280 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

16 is a view showing a thirteenth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

More specifically, the wavelength band combining and separating apparatus of the present invention shown in FIG. 16 includes a first edge filter for separating the X-band of 1360 nm or less and the Y-band of 1415 nm or more of the wavelength band of the transmitted light; A first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more; And a second CWDM filter separating the Z2-band in the range of 1550 to 1560 nm in the Y-band of 1415 nm or more. And a third CWDM filter separating the Z3-band in the range of 1300 to 1320 nm in the X-band of 1360 nm or less. In the thirteenth embodiment of the present invention, the reflective terminal of the first edge filter is connected to the reflective terminal of the first CWDM filter, and the pass terminal of the first edge filter is connected to the reflective terminal of the third CWDM filter. The pass terminal of the third CWDM filter is connected to the common terminal of the first CWDM filter. The pass terminal of the first CWDM filter is connected to the common terminal of the second CWDM filter. At this time, the first edge filter is a signal in the wavelength band (X-band) of 1360 nm or less of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more to the reflection terminal. It serves to separate. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. The second CWDM filter outputs a signal in a wavelength band (Z2-band) in a range of 1550 to 1560 nm to a reflection terminal, and outputs a signal in the remaining wavelength band to a pass terminal. The second CWDM filter outputs signals in the wavelength band (Z3-band) in the range of 1300 to 1320 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal.

16A is a view showing a first modification of the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the first modification of the thirteenth embodiment shown in FIG. 16A passes through each of the first to third CWDM filters in the wavelength band combining and separating device shown in FIG. 16. The functions of the terminal and the reflective terminal are interchanged so that the pass terminal is a reflective terminal and the reflecting terminal is a pass terminal. In this case, the first CWDM filter outputs a signal in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs the signal in the remaining wavelength band to the reflective terminal. The second CWDM filter outputs a signal in a wavelength band (Z2-band) in a range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z3-band) in the range of 1300 to 1320 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

16B is a view showing a second modification of the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the thirteenth embodiment shown in FIG. 16B is provided with the pass terminal and the reflective terminal of the first edge filter in the wavelength band combining and separating device shown in FIG. 16. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate.

16C is a view showing a third modification of the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the thirteenth embodiment shown in FIG. 16C includes a first edge filter, and first to third in the wavelength band combining and separating apparatus shown in FIG. 16. The pass terminals and the reflective terminals of the CWDM filters are interchanged with each other so that the pass terminals are changed to the reflective terminals and the reflective terminals are changed to the pass terminals. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs signals in the remaining wavelength band to the reflective terminal. The second CWDM filter outputs a signal in a wavelength band (Z2-band) in a range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z3-band) in the range of 1300 to 1320 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

17 is a view showing a fourteenth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

More specifically, the wavelength band combining and separating apparatus of the present invention shown in FIG. 17 includes a first edge filter for separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more of the wavelength bands of transmitted light; A first CWDM filter separating the Z1-band in the range of 1480 to 1500 nm within the Y-band of 1415 nm or more; And a second CWDM filter separating the Z2-band in the range of 1550 to 1560 nm in the Y-band of 1415 nm or more. And a third CWDM filter separating the Z3-band in the range of 1300-1320 nm in the X-band of 1360 nm or less. In the fourteenth embodiment of the present invention, the reflective terminal of the first edge filter is connected to the reflective terminal of the first CWDM filter, and the pass terminal of the first edge filter is connected to the pass terminal of the third CWDM filter. The reflective terminal of the third CWDM filter is connected to the common terminal of the second CWDM filter. The common terminal of the first CWDM filter is connected to the pass terminal of the second CWDM filter. At this time, the first edge filter is a signal in the wavelength band (X-band) of 1360 nm or less of the signal input to the common terminal, respectively, the signal of the wavelength band (Y-band) of 1415 nm or more to the reflection terminal. It serves to separate. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. The second CWDM filter outputs a signal in a wavelength band (Z2-band) in a range of 1550 to 1560 nm to a reflection terminal, and outputs a signal in the remaining wavelength band to a pass terminal. The second CWDM filter outputs signals in the wavelength band (Z3-band) in the range of 1300 to 1320 nm to the reflection terminal, and outputs signals in the remaining wavelength band to the pass terminal. Referring to FIG. 17, the wavelength band combining and separating apparatus according to the fourteenth embodiment of the present invention performs substantially the same function as the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention illustrated in FIG. 16. .

17A is a view showing a first modification of the wavelength band combining and separating apparatus according to the fourteenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the fourteenth embodiment shown in FIG. 17A is a pass terminal of each of the first to third CWDM filters in the wavelength band combining and separating apparatus shown in FIG. 17. And a case in which the function of the reflective terminal is changed so that the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, the first CWDM filter outputs a signal in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs the signal in the remaining wavelength band to the reflective terminal. The second CWDM filter outputs a signal in a wavelength band (Z2-band) in a range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z3-band) in the range of 1300 to 1320 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

17B is a view showing a second modification of the wavelength band combining and separating apparatus according to the thirteenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating device according to the second modification of the fourteenth embodiment shown in FIG. 17B may be provided with the pass terminal and the reflective terminal of the first edge filter in the wavelength band combining and separating device shown in FIG. 17. The functions are interchanged to illustrate the case where the pass terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass terminal. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate.

17C is a view showing a third modification of the wavelength band combining and separating apparatus according to the fourteenth embodiment of the present invention shown in FIG.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the fourteenth embodiment shown in FIG. 17C includes a first edge filter, first to third in the wavelength band combining and separating apparatus shown in FIG. 17. The pass terminals and the reflective terminals of the CWDM filters are interchanged with each other so that the pass terminals are changed to the reflective terminals and the reflective terminals are changed to the pass terminals. In this case, each of the first edge filters has a signal in the wavelength band (X-band) of 1360 nm or less and a signal in the wavelength band (Y-band) of 1415 nm or more. It serves to separate. The first CWDM filter outputs signals in the wavelength band (Z1-band) in the range of 1480 to 1500 nm to the pass terminal, and outputs signals in the remaining wavelength band to the reflective terminal. The second CWDM filter outputs a signal in a wavelength band (Z2-band) in a range of 1550 to 1560 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal. In addition, the third CWDM filter outputs a signal in a wavelength band (Z3-band) in the range of 1300 to 1320 nm to a pass terminal, and outputs a signal in the remaining wavelength band to a reflective terminal.

In the first to fourteenth embodiments and modifications thereof of the present invention shown in Figs. 4 to 17 described above, the wavelength band combining and separating device having four input / output terminals of the present invention includes four WDM filters (two Although it is shown and described as being composed of an edge filter and two CWDM filters, or a combination of one edge filter and three CWDM filters), those skilled in the art will appreciate the wavelength band with four input / output terminals of the present invention. It will be appreciated that the coupling and separation device may be implemented as one integrated element that functions the same as the combination of the four WDM filters described above. One integrated device has the advantage of minimizing insertion loss through four input and output terminals compared to four WDM filter combinations. In addition, the ranges of the X-band, Y-band, and Z-band used in the above-described wavelength band combining and separating apparatus according to the present invention are exemplary, and the scope of the present invention is X-band, Y in this specific range. It is not limited to the -band and the Z-band. For example, when implementing the wavelength band combining and separating apparatus according to the present invention as a wavelength variable WDM filter, the range of the X-band, Y-band, and Z-band can be varied as necessary.

The above-described wavelength band combining and separating apparatus according to the present invention combines a wavelength band for a new bidirectional transmission and a wavelength band for a new unidirectional loss while accommodating the existing wavelength band transmitted in both directions through a line of optical transmission lines. And a separating function. Therefore, when the wavelength band combining and separating apparatus according to the present invention is used in an existing metro network or a subscriber network, it is possible to expand a network for the evolution of the existing metro network or a subscriber network. For example, when the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIGS. 4 to 4c is used in an existing subscriber network, an uplink signal of 1260 to 1360 nm band (X-band) is used. TDM-PON bidirectional transmission signals using the 1480 to 1500 nm band (Z1-band) as the downlink signals are divided into Y1-band and Y2-band bidirectional signal bands of the passive optical subscriber network (WDM-PON). You can add You can also add the 1550-1560 nm band (Z2-band) as the wavelength band for video overlay. In more detail, the common terminal of the first edge filter of the wavelength band combining and separating apparatus according to the first embodiment of the present invention shown in FIGS. 4 to 4c is connected to a central station (CO: Central) of the TDM-PON. Office) Connect to the optical line termination (OLT) side, connect the common terminal of the second edge filter to the remote node (RN) side, and the pass terminal of the second CWDM filter to the central station optical of the WDM-PON Connected to the end device (OLT) side and the reflective terminal of the second CWDM filter is located in the central station of the WDM-PON, the added wavelength band combining and separating device of the present invention combines and separates signals for new bidirectional transmission. At the same time, it can simultaneously perform the function of evolving the existing subscriber network (that is, the function of providing higher bandwidth service by adding WDM-PON and video signal). In addition, according to the wavelength band combining and separating apparatus according to the present invention, since the central station optical end device (OLT) of the new subscriber network can be added at any position of the existing subscriber network as well as the central station of the existing subscriber network according to the additional position. It can increase the flexibility and scalability of the subscriber network.

The wavelength band combining and separating device having four input / output terminals according to the present invention has the following effects.

1. The present invention can be implemented with a low cost and simple configuration, and can perform a function as a conventional wavelength add / drop multiplexer.

2. Unlike the conventional add / drop multiplexer, which combines and separates only signals of a specific wavelength, the present invention has high utilization because it can combine and separate a range of wavelength bands into an existing signal band.

3. The present invention can be utilized as an element for the evolution and expansion of the existing metro network or subscriber network can economically improve the performance of the optical communication system.

4. The present invention can increase the flexibility and expandability of the existing metro network or subscriber network.

As various modifications may be made to the constructions and methods described and illustrated herein without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings be exemplary, and not intended to limit the invention. It is not. Therefore, the scope of the present invention should not be limited by the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

Claims (76)

A wavelength band combining and separating device having four input / output terminals for bidirectional communication, The wavelength band combining and separating device A first wavelength division multiplexing (WDM) filter for separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light transmitted through the four input / output terminals; A second WDM filter connected to the first WDM filter and separating an X-band below the first wavelength and a Y-band above the second wavelength among wavelength bands of light transmitted through the four input / output terminals; A third WDM filter coupled to the first and second WDM filters, respectively, separating a Z1-band in a third wavelength range within a Y-band above the second wavelength; And A fourth WDM filter coupled to the third WDM filter and separating a Z2-band in a fourth wavelength range within a Y-band above the second wavelength Wavelength band combining and separating device. The method of claim 1, The first WDM filter is composed of a first edge filter, The second WDM filter is composed of a second edge filter, The third WDM filter is composed of a first low density wavelength division multiplexing (CWDM) filter, The fourth WDM filter is composed of a second CWDM filter Wavelength band combining and separating device. The method of claim 2, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The second edge filter includes a second common terminal, a second reflective terminal, and a second pass terminal, The first CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The second CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass through terminal, The first reflective terminal of the first edge filter is connected to the third reflective terminal of the first CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the second edge filter, The second reflective terminal of the second edge filter is connected to the third common terminal of the first CWDM filter, A third pass terminal of the first CWDM filter is connected to the fourth common terminal of the second CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The second edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and outputs a Y-band signal of more than the second wavelength. Is output to the second reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 3, wherein In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is located at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is located at the position of the fourth pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method of claim 3, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. To output to the second pass terminal Wavelength band combining and separating device. The method of claim 3, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is positioned at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is positioned at the position of the fourth pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. Is output to the second pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method of claim 2, The third WDM filter is connected to the first WDM filter, The fourth WDM filter is connected to the second and third WDM filters, respectively. The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The second edge filter includes a second common terminal, a second reflective terminal, and a second pass terminal, The first CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The second CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass through terminal, The first reflective terminal of the first edge filter is connected to the third reflective terminal of the first CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the second edge filter, The second reflective terminal of the second edge filter is connected to the fourth common terminal of the second CWDM filter, A third common terminal of the first CWDM filter is connected to the fourth pass terminal of the second CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The second edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and outputs a Y-band signal of more than the second wavelength. Is output to the second reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 7, wherein In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is positioned at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is positioned at the position of the fourth pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method of claim 7, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. To output to the second pass terminal Wavelength band combining and separating device. The method of claim 7, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is positioned at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is positioned at the position of the fourth pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. Is output to the second pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method according to any one of claims 1 to 10, Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, said third wavelength is 1480-1500 nm, and said fourth wavelength is 1550-1560 nm. A wavelength band combining and separating device having four input / output terminals for bidirectional communication, The wavelength band combining and separating device A first WDM filter for separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light transmitted through the four input / output terminals; A second WDM filter coupled to the first WDM filter for separating a Z1-band in a third wavelength range within a Y-band above the second wavelength; A third WDM filter connected to the first and second WDM filters, respectively, for separating the Z1-band in the third wavelength range within the Y-band above the second wavelength; And A fourth WDM filter coupled to the third WDM filter for separating the Z2-band of the fourth wavelength range within the Y-band above the second wavelength; Wavelength band combining and separating device. The method of claim 12, The first WDM filter is composed of a first edge filter, The second WDM filter is composed of a first Coarse Wavelength-Division Multiplexing (CWDM) filter, The third WDM filter is composed of a second CWDM filter, The fourth WDM filter is composed of a third CWDM filter. Wavelength band combining and separating device. The method of claim 13, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the third common terminal of the second CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third pass terminal of the second CWDM filter is connected to the fourth common terminal of the third CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 14, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 14, In the first edge filter, the first pass-through terminal is located at the position of the first reflecting terminal and the first reflecting terminal is located at the position of the first pass-through terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 14, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 13, The third WDM filter is connected to the second WDM filter, The fourth WDM filter is connected to the first and third WDM filters, respectively. The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the fourth common terminal of the third CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third pass terminal of the second CWDM filter is connected to the first common terminal of the first edge filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 18, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 18, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 18, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 13, The first WDM filter is connected to the second and third WDM filters, respectively. The second WDM filter is connected to the third WDM filter, The fourth WDM filter is connected to the first WDM filter, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the fourth common terminal of the third CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third common terminal of the second CWDM filter is connected to the fourth pass terminal of the third CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 22, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 22, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 22, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 13, The first WDM filter is connected to the second and fourth WDM filters, respectively. The second WDM filter is connected to the third WDM filter, The third WDM filter is connected to the fourth WDM filter, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The first common terminal of the first edge filter is connected to the fourth pass terminal of the third CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third pass terminal of the second CWDM filter is connected to the fourth common terminal of the third CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 26, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 26, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 26, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method according to any one of claims 12 to 29, wherein Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, said third wavelength is 1480-1500 nm, and said fourth wavelength is 1550-1560 nm. A wavelength band combining and separating device having four input / output terminals for bidirectional communication, The wavelength band combining and separating device A first wavelength division multiplexing (WDM) filter for separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light transmitted through the four input / output terminals; A second WDM filter connected to the first WDM filter and separating an X-band below the first wavelength and a Y-band above the second wavelength among wavelength bands of light transmitted through the four input / output terminals; A third WDM filter coupled to the first and second WDM filters, respectively, for separating a Z1-band in a third wavelength range within an X-band below the first wavelength; And A fourth WDM filter coupled to the third WDM filter, separating a Z2-band in a fourth wavelength range within an X-band below the first wavelength Wavelength band combining and separating device. The method of claim 31, wherein The first WDM filter is composed of a first edge filter, The second WDM filter is composed of a second edge filter, The third WDM filter is composed of a first Coarse Wavelength-Division Multiplexing (CWDM) filter, The fourth WDM filter is composed of a second CWDM filter Wavelength band combining and separating device. The method of claim 32, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The second edge filter includes a second common terminal, a second reflective terminal, and a second pass terminal, The first CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The second CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass through terminal, The first reflective terminal of the first edge filter is connected to the third reflective terminal of the first CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the second edge filter, The second reflective terminal of the second edge filter is connected to the third common terminal of the first CWDM filter, A third pass terminal of the first CWDM filter is connected to the fourth common terminal of the second CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The second edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and outputs a Y-band signal of more than the second wavelength. Is output to the second reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 32, In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is positioned at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is positioned at the position of the fourth pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method of claim 32, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. To output to the second pass terminal Wavelength band combining and separating device. The method of claim 32, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is positioned at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is positioned at the position of the fourth pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. Is output to the second pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method of claim 32, The third WDM filter is connected to the first WDM filter, The fourth WDM filter is connected to the second and third WDM filters, respectively. The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The second edge filter includes a second common terminal, a second reflective terminal, and a second pass terminal, The first CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The second CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass through terminal, The first reflective terminal of the first edge filter is connected to the third reflective terminal of the first CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the second edge filter, The second reflective terminal of the second edge filter is connected to the fourth common terminal of the second CWDM filter, A third common terminal of the first CWDM filter is connected to the fourth pass terminal of the second CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The second edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and outputs a Y-band signal of more than the second wavelength. Is output to the second reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 37, wherein In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is positioned at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is positioned at the position of the fourth pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method of claim 37, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. To output to the second pass terminal Wavelength band combining and separating device. The method of claim 37, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the second edge filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the first CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, The fourth pass terminal is positioned at the position of the fourth reflecting terminal in the second CWDM filter, and the fourth reflecting terminal is positioned at the position of the fourth pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The second edge filter outputs an X-band signal below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second reflection terminal, and outputs a Y-band signal greater than or equal to the second wavelength. Is output to the second pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band other than the fourth wavelength range to the fourth reflective terminal. Wavelength band combining and separating device. The method according to any one of claims 31 to 40, Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, said third wavelength is 1300-1320 nm, and said fourth wavelength is 1260-1280 nm. A wavelength band combining and separating device having four input / output terminals for bidirectional communication, The wavelength band combining and separating device A first WDM filter for separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light transmitted through the four input / output terminals; A second WDM filter coupled to the first WDM filter for separating a Z1-band in a third wavelength range within an X-band below the first wavelength; A third WDM filter connected to the first and second WDM filters, respectively, for separating the Z1-band in the third wavelength range within an X-band below the first wavelength; And A fourth WDM filter coupled to the third WDM filter for separating the Z2-band of the fourth wavelength range within the X-band below the first wavelength Wavelength band combining and separating device. The method of claim 42, wherein The first WDM filter is composed of a first edge filter, The second WDM filter is composed of a first Coarse Wavelength-Division Multiplexing (CWDM) filter, The third WDM filter is composed of a second CWDM filter, The fourth WDM filter is composed of a third CWDM filter. Wavelength band combining and separating device. The method of claim 43, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the third common terminal of the second CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third pass terminal of the second CWDM filter is connected to the fourth common terminal of the third CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 44, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 44, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 44, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 43, The third WDM filter is connected to the second WDM filter, The fourth WDM filter is connected to the first and third WDM filters, respectively. The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the fourth common terminal of the third CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third pass terminal of the second CWDM filter is connected to the first common terminal of the first edge filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 48, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 48, In the first edge filter, the first pass-through terminal is located at the position of the first reflecting terminal and the first reflecting terminal is located at the position of the first pass-through terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 48, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 43, The first WDM filter is connected to the second and third WDM filters, respectively. The second WDM filter is connected to the third WDM filter, The fourth WDM filter is connected to the first WDM filter, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the fourth common terminal of the third CWDM filter, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third common terminal of the second CWDM filter is connected to the fourth pass terminal of the third CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 52, wherein The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 52, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 52, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 43, The first WDM filter is connected to the second and fourth WDM filters, respectively. The second WDM filter is connected to the third WDM filter, The third WDM filter is connected to the fourth WDM filter, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first pass terminal of the first edge filter is connected to the second pass terminal of the first CWDM filter, The first common terminal of the first edge filter is connected to the fourth pass terminal of the third CWDM filter, The second reflective terminal of the first CWDM filter is connected to the third reflective terminal of the second CWDM filter, A third pass terminal of the second CWDM filter is connected to the fourth common terminal of the third CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second pass terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third reflection terminal, and outputs a signal in a wavelength band other than the third wavelength range to the third pass terminal, The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 56, wherein The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 56, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 56, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and a wavelength band other than the third wavelength range. Outputs a signal of to the second reflective terminal, The second CWDM filter outputs a Z1-band signal in the third wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the third reflective terminal. The third CWDM filter outputs a Z2-band signal in the fourth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method according to any one of claims 42 to 59, Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, said third wavelength is 1300-1320 nm, and said fourth wavelength is 1260-1280 nm. A wavelength band combining and separating device having four input / output terminals for bidirectional communication, The wavelength band combining and separating device A first wavelength division multiplexing (WDM) filter for separating an X-band below a first wavelength and a Y-band above a second wavelength among wavelength bands of light transmitted through the four input / output terminals; A second WDM filter coupled to the first WDM filter and separating a Z1-band in a third wavelength range within a Y-band above the second wavelength; A third WDM filter coupled to the second WDM filter and separating a Z2-band in a fourth wavelength range within a Y-band above the second wavelength; And A fourth WDM filter connected to the first and second WDM filters, respectively, separating a Z3-band in a fifth wavelength range within an X-band below the first wavelength Wavelength band combining and separating device. 62. The method of claim 61, The first WDM filter is composed of a first edge filter, The second WDM filter is composed of a first Coarse Wavelength-Division Multiplexing (CWDM) filter, The third WDM filter is composed of a second CWDM filter, The fourth WDM filter is composed of a third CWDM filter. Wavelength band combining and separating device. The method of claim 62, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the second reflective terminal of the first CWDM filter, The first pass terminal of the first edge filter is connected to the fourth reflective terminal of the third CWDM filter, The fourth pass terminal of the third CWDM filter is connected to the second common terminal of the first CWDM filter, A second pass terminal of the first CWDM filter is connected to the third common terminal of the second CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the second reflection terminal, and outputs a signal in a wavelength band outside the third wavelength range to the second pass terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the third reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the third pass terminal, The third CWDM filter outputs a Z3-band signal in the fifth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fifth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 63, wherein The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal in the third wavelength range to the second pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the second reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the third reflective terminal, The third CWDM filter outputs a Z3-band signal in the fifth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fifth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 63, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 63, wherein The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the second pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the second reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the third reflective terminal, The third CWDM filter outputs a Z3-band signal in the fifth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fifth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 62, The second WDM filter is connected to the first WDM filter, The third WDM filter is connected to the second and fourth WDM filters, respectively. The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The first CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The second CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The third CWDM filter has a fourth common terminal, a fourth reflective terminal, and a fourth pass-through terminal, The first reflective terminal of the first edge filter is connected to the second reflective terminal of the first CWDM filter, The first pass terminal of the first edge filter is connected to the fourth pass terminal of the third CWDM filter, The fourth reflective terminal of the third CWDM filter is connected to the third common terminal of the second CWDM filter, A third pass terminal of the second CWDM filter is connected to the second common terminal of the first CWDM filter, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first pass-through terminal, and outputs a Y-band signal of more than the second wavelength. Outputs to the first reflective terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the second reflection terminal, and outputs a signal in a wavelength band outside the third wavelength range to the second pass terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the third reflection terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the third pass terminal, The third CWDM filter outputs a Z3-band signal in the fifth wavelength range to the fourth reflection terminal, and outputs a signal in a wavelength band outside the fifth wavelength range to the fourth pass terminal. Wavelength band combining and separating device. The method of claim 67, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first CWDM filter outputs a Z1-band signal in the third wavelength range to the second pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the second reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the third reflective terminal, The third CWDM filter outputs a Z3-band signal in the fifth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fifth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of claim 67, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. To output to the first pass-through terminal Wavelength band combining and separating device. The method of claim 67, The first pass terminal is positioned at the position of the first reflective terminal in the first edge filter, and the first reflecting terminal is positioned at the position of the first pass terminal, The second pass terminal is positioned at the position of the second reflecting terminal in the first CWDM filter, and the second reflecting terminal is positioned at the position of the second pass terminal, In the second CWDM filter, the third pass terminal is located at the position of the third reflecting terminal, and the third reflecting terminal is located at the position of the third pass terminal, In the third CWDM filter, the fourth pass terminal is positioned at the position of the fourth reflecting terminal, and the fourth reflect terminal is positioned at the position of the fourth pass terminal. The first edge filter outputs an X-band signal of less than or equal to the first wavelength among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs an Y-band signal of more than the second wavelength. Outputs to the first pass terminal, The first CWDM filter outputs a Z1-band signal in the third wavelength range to the second pass terminal, and outputs a signal in a wavelength band outside the third wavelength range to the second reflective terminal. The second CWDM filter outputs a Z2-band signal in the fourth wavelength range to the third pass terminal, and outputs a signal in a wavelength band outside the fourth wavelength range to the third reflective terminal, The third CWDM filter outputs a Z3-band signal in the fifth wavelength range to the fourth pass terminal, and outputs a signal in a wavelength band outside the fifth wavelength range to the fourth reflection terminal. Wavelength band combining and separating device. The method of any one of claims 61-70, The first wavelength is 1360 nm, the second wavelength is 1415 nm, the third wavelength is 1480-1500 nm, the fourth wavelength is 1550-1560 nm, and the fifth wavelength is 1300-1320 nm. Wavelength band combining and separating device. The method according to any one of claims 1 to 10, And a wavelength band combining and separating device having the four input / output terminals is implemented as one integrated element having the same function as the combination of the first WDM filter and the fourth WDM filter. The method according to any one of claims 12 to 29, wherein And a wavelength band combining and separating device having the four input / output terminals is implemented as one integrated element having the same function as the combination of the first WDM filter and the fourth WDM filter. The method according to any one of claims 31 to 40, And a wavelength band combining and separating device having the four input / output terminals is implemented as one integrated element having the same function as the combination of the first WDM filter and the fourth WDM filter. The method according to any one of claims 42 to 59, And a wavelength band combining and separating device having the four input / output terminals is implemented as one integrated element having the same function as the combination of the first WDM filter and the fourth WDM filter. The method of any one of claims 61-70, And a wavelength band combining and separating device having the four input / output terminals is implemented as one integrated element having the same function as the combination of the first WDM filter and the fourth WDM filter.

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