KR100801329B1 - Apparatus for combining and splitting wavelength band having three input and output ports - Google Patents

Abstract

A wavelength band combining and separating device having three input/output ports is provided to add a wavelength band for new bidirectional transmission as receiving an existing wavelength band transmitted in both ways through an optical transmission path of one line, therefore high application can be accomplished. Two random input/output ports of three ports consist of the first edge filter for separating an X-band less than the first wavelength and an Y-band more than the second wavelength among wavelength bands of transmitted light, and the second edge filter for separating an X-band less than the first wavelength and an Y-band more than the second wavelength among the wavelength bands of the transmitted light. The remaining one port of the three ports consists of a CWDM(Coarse Wavelength-Division Multiplexing) filter for separating more than one Z-band of the third wavelength range within the Y-band more than the second wavelength.

Description

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

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

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

3A 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. 1.

3B 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. 3A.

3C 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. 3A.

FIG. 3D 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. 3A.

4A is a diagram illustrating a second embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG. 1.

4B 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. 4A.

4C 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. 4A.

4D 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. 4A.

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

5B 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. 5A.

5C 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. 5A.

FIG. 5D 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. 5A.

6A shows a fourth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

6B 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. 6A.

6C 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. 6A.

FIG. 6D 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. 6A.

7A is a diagram illustrating a fifth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG. 2.

FIG. 7B 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. 7A.

FIG. 7C 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. 7A.

FIG. 7D 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. 7A.

8A shows a sixth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

8B 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. 8A.

8C 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. 8A.

FIG. 8D 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. 8A.

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

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, a new wavelength that can add a wavelength band for a new bidirectional transmission while accepting the existing wavelength band transmitted in both directions through a line of optical transmission line as it is It is to provide an optical passive element necessary for combining or separating bands into an existing transmission area.

More specifically, according to the first aspect of the present invention, in the wavelength band combining and separating apparatus having three input / output terminals for bidirectional communication, any two input / output terminals of the three input / output terminals are provided. Each of the first edge filter for separating the X-band below the first wavelength and the Y-band above the second wavelength of the wavelength band of the transmitted light; And a second edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light. And a coarse wavelength-division multiplexing (CWDM) filter that separates one or more Z-bands in the third wavelength range within a Y-band above a second wavelength, wherein crosstalk in the Y-band is In order to reduce the influence on the X-band and Z-band, it is to provide a wavelength band combining and separating device in which a filter for passing the Z-band is located between the first edge filter and the CWDM filter.

According to a second aspect of the present invention, there is provided a wavelength band combining and separating apparatus having three input / output terminals for bidirectional communication, wherein any one input / output terminal of the three input / output terminals is connected to the transmitted light. An edge filter separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands, and the remaining two input / output terminals of the three input / output terminals are respectively Y- above the second wavelength; A first CWDM filter separating one or more Z-bands of the third wavelength range in a band; And a second CWDM filter that separates one or more Z-bands in the third wavelength range within the Y-band above the second wavelength, wherein crosstalk of the Y-band affects the X-band and the Z-band. In order to reduce the loss, the present invention provides a wavelength band combining and separating device in which a filter for passing an X-band is located between the first CWDM filter and the edge filter.

According to a third aspect of the present invention, there is provided a wavelength band combining and separating apparatus having three input / output terminals for bidirectional communication, wherein any two input / output terminals of the three input / output terminals are respectively transmitted. A first edge filter separating an X-band below the first wavelength and a Y-band above the second wavelength among wavelength bands of light; And a second edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light. A Low Wavelength-Division Multiplexing (CWDM) filter that separates one or more Z-bands of the third wavelength range within an X-band below the first wavelength, wherein crosstalk of the X-bands is Y In order to reduce the influence on the band and the Z-band, to provide a wavelength band combining and separating device in which a filter for passing a Z-band is located between the first edge filter and the CWDM filter.

According to a fourth aspect of the present invention, there is provided a wavelength band combining and separating apparatus having three input / output terminals for bidirectional communication, wherein any one input / output terminal of the three input / output terminals is connected to the transmitted light. An edge filter separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands, and the remaining two input / output terminals of the three input / output terminals are each X or below the first wavelength. A first CWDM filter separating one or more Z-bands of the third wavelength range in a band; And a second CWDM filter separating one or more Z-bands of the third wavelength range within an X-band below the first wavelength, wherein crosstalk of the X-bands affects Y-bands and Z-bands. In order to reduce the influence, it is to provide a wavelength band combining and separating device in which a filter passing a Y-band is located between the first CWDM filter and the edge filter.

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 apparatus having three input / output terminals according to the present invention includes a first and a second WDM filter having a function of separating an X-band and a Y-band, and details within an X-band or a Y-band. A wavelength band combining and separating device of a first type having three terminals consisting of a combination of third WDM filters having the function of separating one or more Z-bands which are bands, or within the X-band or Y-band Three terminals comprising a combination of first and second WDM filters having the function of separating one or more Z-bands which are subbands, and a third WDM filter having the function of separating the X- and Y-bands. It may be a second type of wavelength band combining and separating device. More specifically, in the first type of wavelength band combining and separating apparatus, the first and second WDM filters may be edge filters, and the third WDM filter may be CWDM filters. In the second type of wavelength band combining and separating apparatus, the first and second WDM filters may be CWDM filters, and the third WDM filter may be edge filters.

The wavelength band combining and separating apparatus having three input / output terminals according to the present invention described above includes at least four bands (X-band, Z-band, Y1-band, Y2-band, or Y-band, Z-band, Enable bi-directional communication in X1-band, X2-band).

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

First, FIG. 1 is a diagram generally illustrating a separation band and a bidirectional communication band of a WDM filter for bidirectional communication, and FIG. 2 is a diagram illustrating a separation band and a bidirectional communication band of a WDM filter for bidirectional communication. to be.

Referring to FIG. 1, 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 X-band and the Z-band, and the Y-band is divided into two bands (ie, The case of bidirectional communication divided into (Y1-band and Y2-band) is illustrated. In addition, referring to FIG. 2, in the separate and bidirectional communication bands of the WDM filter for bidirectional communication in four bands, bidirectional communication is performed using the Y-band and the Z-band, and the X-band is divided into two bands. The case of bidirectional communication divided by (i.e., X1-band and X2-band) is shown. In the bidirectional communication of FIGS. 1 and 2 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, among the WDM filters used in the bidirectional communication of FIGS. 1 and 2 described above, the first and second WDM filters having a function of separating the X-band and the Y-band are each an edge filter, and an X-band or CWDM filters are used as the third and fourth WDM filters, each having a function of separating one or more Z-bands which are subbands within the Y-band. The CWDM filter used here may separate one or more Z-bands (Z1-band, Z2-band, ...).

3A 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. 1.

Referring to FIG. 3A, 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 one CWDM filter for separating one or more Z-bands within the Y-band. In the embodiment shown in FIG. 3, 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 1480 of Y-bands of 1415 nm or more. Downlink signals in the wavelength band ranging from ˜1500 nm are used as the Z-band. In this case, the downlink signal in the wavelength band of 1550 ~ 1560 nm of the Y-band may be added to the Z2-band.

More specifically, the wavelength band combining and separating apparatus of the present invention shown in FIG. 3A 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 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 CWDM filter separating the Z-band in the range of 1480 to 1500 nm and in the range of 1550 to 1560 nm within the Y-band of 1415 nm or more. In this first embodiment, a reflection port of the first edge filter is connected to the reflection terminal of the CWDM filter, and a pass port of the first edge filter is connected to the pass terminal of the second edge filter. . Also, the reflective terminal of the second edge filter is connected to a common port of the 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. In addition, the CWDM filter outputs signals in the wavelength band (Z-band) in the range of 1480 to 1500 nm and 1550 to 1560 nm to the reflection terminal, and outputs the signals in the remaining wavelength band to the pass terminal. Both the first and second edge filters and the CWDM filter used in FIG. 3A have reversible characteristics as passive elements. Therefore, the Z-band signal in the range of 1480 to 1500 nm and the range of 1550 to 1560 nm is transmitted along the path ①, and the X-band signal of 1360 nm or less is transmitted to the path ② to be used as a bidirectional communication band. In general, in the WDM filter, since the insertion loss of the reflective terminal is smaller than that of the pass terminal, Z-band signals in the range of 1480 to 1500 nm and 1550 to 1560 nm are passed through the reflective terminal. The movement paths of the Y1-band and the Y2-band, which can be used as another bidirectional communication band, are as follows. In this case, the Y1-band and the Y2-band are E-band (wavelength range: 1360-1460 nm), S-band (wavelength range: 1460-1530 nm), and C-band (wavelength range: 1530-1565 nm). Any one of, and an L-band (wavelength range: 1565-1625 nm) may be selected. 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 three input / output terminals as shown in FIG. 3A, and newly added at terminal 3. The bidirectional signal is inputted and outputted, and the second terminal 2 inputs and outputs both an existing bidirectional signal and a newly added bidirectional signal. In addition, since the first and second edge filters and the CWDM filter illustrated in FIG. 3A are passive elements having reversible characteristics, those skilled in the art will appreciate that a Z-band signal in the range of 1480 to 1500 nm and 1550 to 1560 nm can be obtained from the path ①. The X-band signal of 1360 nm or less is transmitted along the reverse direction, and is transmitted along the reverse direction of route ② to be used as a bidirectional communication band. The movement paths of the Y1-band and Y2-bands follow the reverse direction of route ③. It will be appreciated that it can be delivered.

3B 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. 3A.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the first embodiment shown in FIG. 3B has a function of the pass terminal and the reflective terminal of the CWDM filter in the wavelength band combining and separating apparatus shown in FIG. 3A. The case where the pass terminal is changed to a reflecting terminal and the reflecting terminal is changed to a pass terminal is illustrated. In this case, the CWDM filter outputs signals in the wavelength band (Z-band) in the range of 1480 to 1500 nm and 1550 to 1560 nm to the pass terminal, and outputs the signals in the remaining wavelength band to the reflecting terminal.

3C 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. 3A.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the first embodiment shown in FIG. 3c may be configured as the first edge filter and the second edge filter in the wavelength band combining and separating apparatus shown in FIG. 3a, 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.

FIG. 3D 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. 3A.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the first embodiment shown in FIG. 3D may include the first edge filter, the second edge filter and the CWDM in the wavelength band combining and separating apparatus shown in FIG. 3A. The functions of the pass-through terminal and the reflecting terminal of each filter are interchanged with each other, so that 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 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. In addition, the CWDM filter outputs signals in the wavelength band (Z-band) in the range of 1480 to 1500 nm and 1550 to 1560 nm to the pass terminal, and outputs the signals in the remaining wavelength band to the reflecting terminal.

Meanwhile, in FIGS. 3A to 3D, a filter for passing a Z-band between a first edge filter and a CWDM filter to reduce the effect of crosstalk in the Y1-band and the Y2-band on the X-band and the Z-band is provided. May be used additionally. At this time, the filter passing the Z-band may be implemented as a CWDM filter or a band-pass filter (BPF).

4A is a diagram illustrating a second embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG. 1.

Referring to FIG. 4A, the wavelength band combining and splitting apparatus according to the second embodiment of the present invention includes a Z- band having a range of 1480 to 1500 nm and a range of 1550 to 1560 nm within a Y-band of 1415 nm or more of the wavelength band of transmitted light. A first CWDM filter for separating the band; An edge filter separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more of the wavelength band of the transmitted light; And a second CWDM filter separating the Z-bands in the 1480-1500 nm range and the 1550-1560 nm range within the Y-band of 1415 nm or more. In this second embodiment, the reflective terminal of the first CWDM filter is connected to the reflective terminal of the second CWDM filter, and the pass terminal of the first CWDM filter is connected to the pass terminal of the edge filter. The reflective terminal of the edge filter is also connected to the common terminal of the second CWDM filter. Referring to FIG. 4A, the wavelength band combining and separating apparatus according to the second embodiment of the present invention performs the same function as the wavelength band combining and separating apparatus according to the first embodiment of the present invention illustrated in FIG. 3A.

4B 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. 4A.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the second embodiment shown in FIG. 4B may be used for the first CWDM filter and the second CWDM filter in the wavelength band combining and separating apparatus shown in FIG. 4A, 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, the first CWDM filter and the second CWDM filter output signals in the wavelength band (Z-band) in the range of 1480 to 1500 nm and 1550 to 1560 nm, respectively, and the signals in the remaining wavelength band are reflected terminals. Will output

4C 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. 4A.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the second embodiment shown in FIG. 4C has a function of the pass terminal and the reflective terminal of the edge filter in the wavelength band combining and separating apparatus shown in FIG. 4A. The case where the pass terminal is changed to a reflecting terminal and the reflecting terminal is changed to a pass terminal is illustrated. In this case, the edge filter separates signals in the wavelength band (X-band) below 1360 nm among the signals input to the common terminal into reflection terminals and signals in the wavelength band (Y-band) above 1415 nm into the passing terminals. Play a role.

4D 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. 4A.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the second embodiment shown in FIG. 4D includes the first CWDM filter, the second CWDM filter, and the wavelength band combining and separating apparatus shown in FIG. 4A. The case where the pass terminal and the reflecting terminal of each of the edge filters are changed is illustrated 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 (Z-band) in the range of 1480 to 1500 nm and 1550 to 1560 nm, respectively, and the signals in the remaining wavelength band are reflected terminals. Will output In addition, the 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. do.

Meanwhile, in FIGS. 4A to 4D, in order to reduce the influence of crosstalk in the Y1-band and the Y2-band on the X-band and the Z-band, a filter for passing the X-band between the first CWDM filter and the edge filter is shown. May be used additionally. In this case, the filter for passing the X-band may be implemented as an edge filter or a band-pass filter (BPF).

5A is a diagram 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. 5A, the wavelength band combining and separating apparatus according to the third embodiment of the present invention includes a Z- band having a range of 1480 to 1500 nm and a range of 1550 to 1560 nm within a Y-band of 1415 nm or more of the wavelength band of transmitted light. A first CWDM filter for separating the band; A second CWDM filter separating the Z-band in the range of 1480 to 1500 nm and in the range of 1550 to 1560 nm in the Y-band of 1415 nm or more of the wavelength band of the transmitted light; And an 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. In this second embodiment, the reflective terminal of the first CWDM filter is connected to the reflective terminal of the edge filter and the pass terminal of the first CWDM filter is connected to the pass terminal of the second CWDM filter. Also, the reflective terminal of the second CWDM filter is connected to the common terminal of the edge filter. 5A, the wavelength band combining and separating apparatus according to the third embodiment of the present invention is the wavelength band combining and separating apparatus according to the first and second embodiments of the present invention shown in FIGS. 3A and 4A. It can be seen that the characteristics of the through terminal and the reflective terminal are opposite to each other, but perform the same function.

5B 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. 5A.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the third embodiment shown in FIG. 5B may include the first CWDM filter and the second CWDM filter in the wavelength band combining and separating apparatus shown in FIG. 5A, 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, the first CWDM filter and the second CWDM filter are signals of the wavelength band (Z-band) in the range of 1480 to 1500 nm and 1550 to 1560 nm, respectively, of the signals input to the common terminal, and the remaining wavelength band. The signal of serves to separate into the pass terminal.

5C 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. 5A.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the third embodiment shown in FIG. 5C has functions of the pass terminal and the reflective terminal of the edge filter in the wavelength band combining and separating apparatus shown in FIG. 5A. The case where the pass terminal is changed to a reflecting terminal and the reflecting terminal is changed to a pass terminal is illustrated. In this case, the edge filter outputs signals in the wavelength band (X-band) of 1360 nm or less to the pass terminal, and signals in the wavelength band (Y-band) of 1415 nm or more to the reflecting terminal.

FIG. 5D 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. 5A.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the third embodiment shown in FIG. 5D includes the first CWDM filter, the second CWDM filter, and the wavelength band combining and separating apparatus shown in FIG. 5A. The case where the pass terminal and the reflecting terminal of each of the edge filters are changed is illustrated 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 are signals of the wavelength band (Z-band) in the range of 1480 to 1500 nm and 1550 to 1560 nm, respectively, of the signals input to the common terminal, and the remaining wavelength band. The signal of serves to separate into the pass terminal. In addition, the edge filter outputs signals in the wavelength band (X-band) of 1360 nm or less to the pass terminal, and signals in the wavelength band (Y-band) of 1415 nm or more to the reflecting terminal.

Meanwhile, in FIGS. 5A to 5D, in order to reduce the effect of crosstalk in the Y1-band and the Y2-band on the X-band and the Z-band, a filter for passing the X-band between the first CWDM filter and the edge filter is provided. May be used additionally. In this case, the filter that passes the X-band may be implemented as an edge filter or a band-pass filter (BPF).

6A shows a fourth embodiment of a wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG.

Referring to FIG. 6A, a wavelength band combining and separating apparatus according to a fourth 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 one CWDM filter for separating one or more Z-bands within an X-band. In the embodiment shown in FIG. 6A, the uplink signals in the 1300 to 1320 nm range of the uplink signals in the wavelength range of 1260 to 1360 nm, which are already standardized in the time division multiplexing passive optical network (TDM-PON), are transferred to the Z-band. Y-band in the wavelength band of 1415 nm or more is used as the downlink signal.

More specifically, the wavelength band combining and separating apparatus of the present invention shown in FIG. 6A 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 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 CWDM filter that separates the Z-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less. In this fourth embodiment, the reflective terminal of the first edge filter is connected to the reflective terminal of the CWDM filter, and the pass terminal of the first edge filter is connected to the pass terminal of the second edge filter. Also, the reflective terminal of the second edge filter is connected to the common terminal of the CWDM filter. At this time, the first edge filter and the second edge filter are the signals of the wavelength band (X-band) of 1360 nm or less and the signals of the wavelength band (Y-band) of 1415 nm or more, respectively. It serves to separate into the pass terminal. In addition, the CWDM filter outputs signals in the wavelength band (Z-band) in the range of 1260 to 1280 nm and 1300 to 1320 nm to the reflection terminal, and outputs the signals in the remaining wavelength band to the pass terminal. Both the first and second edge filters and the CWDM filter used in FIG. 6A have reversible characteristics as passive elements. Therefore, the Z-band signal in the range of 1260 to 1280 nm and the range of 1300 to 1320 nm are transmitted along the path ①, and the Y-band signal of 1415 nm or more is transmitted to the path ② to be used as a bidirectional communication band. The movement paths of the X1-band and the X2-band, which can be used as another bi-directional communication band, are as follows. At this time, the X1-band and the X2-band may be selected from the wavelength band of the O-band (wavelength range: 1260 ~ 1360 nm). Therefore, the existing bidirectional signal is input and output at terminal 1 of the wavelength band combining and separating apparatus of the present invention having three input / output terminals as shown in FIG. 6A, and newly added at terminal 3. The bidirectional signal is inputted and outputted, and the second terminal 2 inputs and outputs both an existing bidirectional signal and a newly added bidirectional signal. In addition, since the first and second edge filters and the CWDM filter illustrated in FIG. 6A are passive devices having reversible characteristics, those skilled in the art can measure the Z-band signals in the range of 1260 to 1280 nm and 1300 to 1320 nm. Transmitted along the reverse direction, Y-band signals of more than 1415 nm are transmitted along the reverse direction of path ② to be used as a bidirectional communication band, and moving paths of the X1-band and X2-band are transmitted along the reverse direction of path ③. I can fully understand that it can be.

6B 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. 6A.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the fourth embodiment shown in FIG. 6B has a function of the pass terminal and the reflective terminal of the CWDM filter in the wavelength band combining and separating apparatus shown in FIG. 6A. The case where the pass terminal is changed to a reflecting terminal and the reflecting terminal is changed to a pass terminal is illustrated. In this case, the CWDM filter outputs signals in the wavelength band (Z-band) in the range of 1260 to 1280 nm and in the range of 1300 to 1320 nm to the pass terminal, and outputs the signals of the remaining wavelength band to the reflecting terminal.

6C 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. 6A.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the fourth embodiment shown in FIG. 6C may be configured as the first edge filter and the second edge filter in the wavelength band combining and separating apparatus shown in FIG. 6A, 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, the first edge filter and the second edge filter, respectively, of a signal band having a wavelength band of 1360 nm or less (X-band) among the signals input to the common terminal are pass-through terminals, respectively, of a wavelength band of 1415 nm or more (Y-band). The signal serves to separate into reflective terminals.

FIG. 6D 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. 6A.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the fourth embodiment shown in FIG. 6D may include the first edge filter, the second edge filter and the CWDM in the wavelength band combining and separating apparatus shown in FIG. 6A. The functions of the pass-through terminal and the reflecting terminal of each filter are interchanged with each other so that the pass-through terminal is changed to the reflecting terminal and the reflecting terminal is changed to the pass-through terminal. In this case, the first edge filter and the second edge filter, respectively, of a signal band having a wavelength band of 1360 nm or less (X-band) among the signals input to the common terminal are pass-through terminals, respectively, of a wavelength band of 1415 nm or more (Y-band). The signal serves to separate into reflective terminals. In addition, the CWDM filter outputs signals in the wavelength band (Z-band) in the range of 1260 to 1280 nm and 1300 to 1320 nm to the pass terminal, and outputs the signals in the remaining wavelength band to the reflecting terminal.

On the other hand, in Figures 6a to 6d, to reduce the effect of crosstalk in the X1-band and X2-band on the Y-band and Z-band, a filter that passes the Z-band between the first edge filter and the CWDM filter May be used additionally. At this time, the filter passing the Z-band may be implemented as a CWDM filter or a band-pass filter (BPF).

7A is a diagram illustrating a fifth embodiment of the wavelength band combining and separating apparatus according to the present invention for the bidirectional communication band of FIG. 2.

Referring to FIG. 7A, the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention is configured to separate the Z-band in the range of 1300 nm to 1320 nm within an X-band of 1360 nm or less of the wavelength band of transmitted light. 1 CWDM filter; An edge filter separating an X-band of 1360 nm or less and a Y-band of 1415 nm or more of the wavelength band of the transmitted light; And a second CWDM filter separating the Z-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less. In this fifth embodiment, the reflective terminal of the first CWDM filter is connected to the reflective terminal of the second CWDM filter, and the pass terminal of the first CWDM filter is connected to the pass terminal of the edge filter. The reflective terminal of the edge filter is also connected to the common terminal of the second CWDM filter. Referring to FIG. 7A, the wavelength band combining and separating apparatus according to the fifth embodiment of the present invention performs the same function as the wavelength band combining and separating apparatus according to the fourth embodiment of the present invention illustrated in FIG. 6A.

FIG. 7B 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. 7A.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the fifth embodiment shown in FIG. 7B may include the first CWDM filter and the second CWDM filter in the wavelength band combining and separating apparatus shown in FIG. 7A, 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, the first CWDM filter and the second CWDM filter output signals in the wavelength band (Z-band) in the range of 1260 to 1280 nm and 1300 to 1320 nm, respectively, and the signals in the remaining wavelength band are reflected terminals. Will output

FIG. 7C 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. 7A.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the fifth embodiment shown in FIG. 7C has functions of the pass terminal and the reflective terminal of the edge filter in the wavelength band combining and separating apparatus shown in FIG. 7A. The case where the pass terminal is changed to a reflecting terminal and the reflecting terminal is changed to a pass terminal is illustrated. In this case, the edge filter separates signals in the wavelength band (X-band) below 1360 nm among the signals input to the common terminal into pass terminals, and signals in the wavelength band (Y-band) above 1415 nm into the reflective terminals. Do it.

FIG. 7D 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. 7A.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the fifth embodiment shown in FIG. 7D includes the first CWDM filter, the second CWDM filter, and the wavelength band combining and separating apparatus shown in FIG. 7A. The case where the pass terminal and the reflecting terminal of each of the edge filters are changed is illustrated 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 (Z-band) in the range of 1260 to 1280 nm and 1300 to 1320 nm, respectively, and the signals in the remaining wavelength band are reflected terminals. Will output In addition, the 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 to the reflective terminals. do.

On the other hand, in Figures 7a to 7d, in order to reduce the effect of crosstalk of the X1-band and X2-band on the Y-band and Z-band, a filter that passes the Y-band between the first CWDM filter and the edge filter is In addition, it can be used. In this case, the filter passing the Y-band may be implemented as an edge filter or a band-pass filter (BPF).

8A shows 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. 8A, the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention is configured to separate the Z-band in the range of 1300 nm to 1320 nm within the X-band of 1360 nm or less of the wavelength band of transmitted light. 1 CWDM filter; A second CWDM filter for separating the Z-band in the range of 1300 to 1320 nm within the X-band of 1360 nm or less of the wavelength band of the transmitted light; And an edge filter separating the X-band of 1360 nm or less and the Y-band of 1415 nm or more from the wavelength band of the transmitted light. In this sixth embodiment, the reflective terminal of the first CWDM filter is connected to the reflective terminal of the edge filter, and the pass terminal of the first CWDM filter is connected to the pass terminal of the second CWDM filter. Also, the reflective terminal of the second CWDM filter is connected to the common terminal of the edge filter. Referring to FIG. 8A, the wavelength band combining and separating apparatus according to the sixth embodiment of the present invention is the wavelength band combining and separating apparatus according to the fourth and fifth embodiments of the present invention shown in FIGS. 6A and 7A. It can be seen that the characteristics of the through terminal and the reflective terminal are opposite to each other, but perform the same function.

8B 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. 8A.

More specifically, the wavelength band combining and separating apparatus according to the first modification of the sixth embodiment shown in FIG. 8B is characterized in that each of the first CWDM filter and the second CWDM filter in the wavelength band combining and separating apparatus shown in FIG. The function of the pass-through terminal and the reflective terminal is reversed 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, the first CWDM filter and the second CWDM filter are signals of the wavelength band (Z-band) in the range of 1260 to 1280 nm and 1300 to 1320 nm, respectively, of the signals input to the common terminal, and the remaining wavelength band. The signal of serves to separate into the pass terminal.

8C 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. 8A.

More specifically, the wavelength band combining and separating apparatus according to the second modification of the fifth embodiment shown in FIG. 8C has a function of the pass terminal and the reflective terminal of the edge filter in the wavelength band combining and separating apparatus shown in FIG. 8A. The case where the pass terminal is changed to a reflecting terminal and the reflecting terminal is changed to a pass terminal is illustrated. In this case, the edge filter outputs signals in the wavelength band (X-band) of 1360 nm or less to the reflection terminal, and signals in the wavelength band (Y-band) of 1415 nm or more to the pass terminal.

FIG. 8D 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. 8A.

More specifically, the wavelength band combining and separating apparatus according to the third modification of the fifth embodiment shown in FIG. 8D includes the first CWDM filter, the second CWDM filter, and the wavelength band combining and separating apparatus shown in FIG. 8A. The case where the pass terminal and the reflecting terminal of each of the edge filters are changed is illustrated 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 are signals of the wavelength band (Z-band) in the range of 1260 to 1280 nm and 1300 to 1320 nm among the signals input to the common terminal, respectively, as reflection terminals, and the remaining wavelength bands. The signal of serves to separate into the pass terminal. In addition, the edge filter outputs signals in the wavelength band (X-band) of 1360 nm or less to the reflection terminal, and signals in the wavelength band (Y-band) of 1415 nm or more to the pass terminal.

Meanwhile, in FIGS. 8A to 8D, a filter for passing a Y-band between a first CWDM filter and an edge filter, in order to reduce the effect of crosstalk in the X1-band and X2-band on the Y-band and the Z-band, May be used additionally. In this case, the filter passing the Y-band may be implemented as an edge filter or a band-pass filter (BPF).

In the first to sixth embodiments and variations thereof of the present invention shown in Figs. 3A to 8D described above, the wavelength band combining and separating device having three input / output terminals of the present invention comprises three WDM filters (two edges). Filter and one CWDM filter or one edge filter and two CWDM filters), which are shown and described, but one skilled in the art will have the same function as the combination of the three WDM filters described above. It will be appreciated that it may be implemented as an integrated device of. One integrated device has the advantage of minimizing insertion loss through three input and output terminals compared to three 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. In addition, the CWDM filter used in the above-described wavelength band combining and separating apparatus according to the present invention has the function of separating one or more Z-bands (Z1-band, Z2-band, ..., etc.) by further combining and It is possible to increase the wavelength band to be separated.

The above-described wavelength band combining and separating apparatus according to the present invention has a function of combining and separating wavelength bands for new bidirectional transmission while accommodating existing wavelength bands transmitted in both directions through one line of optical transmission lines. 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 of the present invention shown in FIGS. 3A to 3D is used in a subscriber network, the 1260-1360 nm band (X-band) is used as an uplink signal, and the 1480-1500 nm band ( Z1-band) can be added to the bidirectional transmission signal of the TDM-PON as a downlink signal as the bidirectional signal band of the WDM-PON wavelength division multiplexing passive optical subscriber network (WDM-PON). 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 of the present invention shown in FIGS. 3A to 3D is connected to a central office (CO) optical terminator (CO) of a TDM-PON. OLT: Connect to the Optical Line Termination side, connect the common terminal of the second edge filter to the remote node (RN) side, and connect the pass terminal of the CWDM filter to the central station optical termination unit (OLT) side of the WDM-PON In other words, the added wavelength band combining and separating apparatus of the present invention performs the function of combining and separating signals for new bidirectional transmission while evolving an existing subscriber network (that is, adding a WDM-PON to a higher bandwidth). Function to provide services) can be performed at the same time. In addition, according to the wavelength band combining and separating apparatus according to the present invention, the central station optical end device (OLT) of the new network can be added at any position of the network as well as the central station, so that flexibility and expandability of the network can be achieved. You can increase it.

The wavelength band combining and separating device having three 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 (48)

A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any two input / output terminals of the three input / output terminals may each include: a first edge filter for separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light; And a second edge filter separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light, Coarse Wavelength-Division Multiplexing (CWDM) filter which separates one or more Z-bands of the third wavelength range within the Y-band of the second wavelength or more of the three input / output terminals. Consists of, In order to reduce the effect of crosstalk in the Y-band on the X-band and Z-band, a filter for passing the Z-band is located between the first edge filter and the CWDM filter. Wavelength band combining and separating device. The method of claim 1, The Z-band passing filter is a wavelength band combining and separation device implemented as a CWDM filter or a band-pass filter (BPF). The method of claim 1, 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 CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The first reflective terminal of the first edge filter is connected to the third reflective terminal of the 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 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 below the first wavelength among the wavelength bands of the transmitted light input to the second common terminal to the second pass terminal, and Y-band above the second wavelength. A signal is output to the second reflective terminal, The CWDM filter outputs one or more Z-band signals in the third wavelength range to the third reflection terminal and outputs signals in wavelength bands outside the third wavelength range to the third pass terminal. Wavelength band combining and separating device. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any two input / output terminals of the three input / output terminals may each include: a first edge filter for separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light; And a second edge filter separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light, Coarse Wavelength-Division Multiplexing (CWDM) filter which separates one or more Z-bands of the third wavelength range within the Y-band of the second wavelength or more of the three input / output terminals. Consists of, The first edge filter includes a first common terminal, a first reflective terminal, and a first pass-through terminal, The second edge filter has a second common terminal, a second reflective terminal, and a second pass terminal, The CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The first reflective terminal of the first edge filter is connected to the third pass terminal of the 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 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 CWDM filter outputs one or more Z-band signals in the third wavelength range to the third pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the third reflective terminal. Wavelength band combining and separating device. The method of claim 4, wherein The first pass terminal of the first edge filter is connected to the third reflective terminal of the CWDM filter, The first reflective terminal of the first edge filter is connected to the second reflective terminal of the second edge filter, The second pass terminal of the second edge filter is connected to the third common terminal of the 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 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 CWDM filter outputs one or more Z-band signals in the third wavelength range to the third reflection terminal and outputs signals in wavelength bands outside the third wavelength range to the third pass terminal. Wavelength band combining and separating device. The method of claim 4, wherein The first pass terminal of the first edge filter is connected to the third pass terminal of the CWDM filter, The first reflective terminal of the first edge filter is connected to the second reflective terminal of the second edge filter, The second pass terminal of the second edge filter is connected to the third common terminal of the 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 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 CWDM filter outputs one or more Z-band signals in the third wavelength range to the third pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the third reflective terminal. Wavelength band combining and separating device. The method according to any one of claims 4 to 6, A wavelength band combining and separating device in which a filter for passing the Z-band is located between the first edge filter and the CWDM filter to reduce the effect of crosstalk of the Y-band on the X-band and the Z-band. . The method of claim 7, wherein The Z-band passing filter is a wavelength band combining and separation device implemented as a CWDM filter or a band-pass filter (BPF). The method according to any one of claims 1 to 6, The Y-band is any one of the Y1-band and the Y2-band, and the Y1-band and the Y2-band are any of the wavelength bands consisting of the E-band, the S-band, the C-band, and the L-band, respectively. One wavelength band combining and separating device. The method according to any one of claims 1 to 6, Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, and said third wavelength is any one or both of 1480-1500 nm and 1550-1560 nm. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any one input / output terminal of the three input / output terminals is composed of an edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light, The remaining two input / output terminals of the three input / output terminals each include: a first CWDM filter separating one or more Z-bands of the third wavelength range within the Y-band of the second wavelength or more; And a second CWDM filter separating one or more Z-bands of the third wavelength range within the Y-bands of the second wavelength or more, In order to reduce the effect of crosstalk in the Y-band on the X-band and the Z-band, a filter for passing the X-band is located between the first CWDM filter and the edge filter. Wavelength band combining and separating device. The method of claim 11, The X-band passing filter is a wavelength band combining and separation device implemented as an edge filter or a band-pass filter (BPF). The method of claim 11, The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The first pass terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The third reflective terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second reflecting terminal, outputs a signal in a wavelength band outside the third wavelength range to the second pass terminal, The edge filter outputs an X-band signal below the first wavelength to the third pass terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Output to the third reflective terminal Wavelength band combining and separating device. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any one input / output terminal of the three input / output terminals is composed of an edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light, The remaining two input / output terminals of the three input / output terminals each include: a first CWDM filter separating one or more Z-bands of the third wavelength range within the Y-band of the second wavelength or more; And a second CWDM filter separating one or more Z-bands of the third wavelength range within the Y-bands of the second wavelength or more, The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The first reflective terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The third reflective terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the second reflective terminal, The edge filter outputs an X-band signal below the first wavelength to the third pass terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Output to the third reflective terminal Wavelength band combining and separating device. The method of claim 14, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The first pass terminal of the first CWDM filter is connected to the third reflective terminal of the edge filter, The third pass terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second reflecting terminal, outputs a signal in a wavelength band outside the third wavelength range to the second pass terminal, The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Output to the third pass terminal Wavelength band combining and separating device. The method of claim 14, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The first reflective terminal of the first CWDM filter is connected to the third reflective terminal of the edge filter, The third pass terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the second reflective terminal, The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Output to the third pass terminal Wavelength band combining and separating device. The method of claim 11, The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first reflective terminal of the first CWDM filter is connected to the third reflective terminal of the edge filter, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The second reflective terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals 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 is outside the third wavelength range. Outputs a signal in a wavelength band to the second reflecting terminal; The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Wavelength band combining and separating device. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any one input / output terminal of the three input / output terminals is composed of an edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light, The remaining two input / output terminals of the three input / output terminals each include: a first CWDM filter for separating one or more Z-bands of the third wavelength range within the Y-band of the second wavelength or more; And a second CWDM filter separating one or more Z-bands of the third wavelength range within the Y-bands of the second wavelength or more, The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first pass terminal of the first CWDM filter is connected to the third reflecting terminal of the edge filter, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The second pass terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal and is outside the third wavelength range. Outputs a signal in a wavelength band to the second pass terminal; The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Wavelength band combining and separating device. The method of claim 18, The first reflective terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The second reflective terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals 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 is outside the third wavelength range. Outputs a signal in a wavelength band to the second reflecting terminal; The edge filter outputs an X-band signal below the first wavelength to the third pass terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Wavelength band combining and separating device. The method of claim 18, The first pass terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The second pass terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal and is outside the third wavelength range. Outputs a signal in a wavelength band to the second pass terminal; The edge filter outputs an X-band signal below the first wavelength to the third pass terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Wavelength band combining and separating device. The method according to any one of claims 14 to 16 and 18 to 20, And a filter for passing an X-band between the first CWDM filter and the edge filter to reduce the effect of crosstalk in the Y-band on the X-band and the Z-band. The method of claim 21, The X-band passing filter is a wavelength band combining and separation device implemented as an edge filter or a band-pass filter (BPF). The method according to any one of claims 11 to 20, The Y-band is any one of the Y1-band and the Y2-band, and the Y1-band and the Y2-band are each of a wavelength band consisting of an E-band, an S-band, a C-band, and an L-band. One-wavelength band combining and separating device. The method according to any one of claims 11 to 20, Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, and said third wavelength is any one or both of 1480-1500 nm and 1550-1560 nm. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any two input / output terminals of the three input / output terminals may each include: a first edge filter for separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light; And a second edge filter separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light, Coarse Wavelength-Division Multiplexing (CWDM) which separates one or more Z-bands of the third wavelength range within the X-band below the first wavelength from the three input / output terminals. Consists of filters, In order to reduce the influence of crosstalk of the X-band on the Y-band and the Z-band, a filter for passing a Z-band is located between the first edge filter and the CWDM filter. Wavelength band combining and separating device. The method of claim 25, The Z-band passing filter is a wavelength band combining and separation device implemented as a CWDM filter or a band-pass filter (BPF). The method of claim 25, 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 CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The first reflective terminal of the first edge filter is connected to the third reflective terminal of the 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 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 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 CWDM filter outputs one or more Z-band signals in the third wavelength range to the third reflection terminal and outputs signals in wavelength bands outside the third wavelength range to the third pass terminal. Wavelength band combining and separating device. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any two input / output terminals of the three input / output terminals may each include: a first edge filter for separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light; And a second edge filter separating an X-band below the first wavelength and a Y-band above the second wavelength among the wavelength bands of the transmitted light, Coarse Wavelength-Division Multiplexing (CWDM) which separates one or more Z-bands of the third wavelength range within the X-band below the first wavelength from the three input / output terminals. Consists of filters, 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 CWDM filter has a third common terminal, a third reflective terminal, and a third pass through terminal, The first reflective terminal of the first edge filter is connected to the third pass terminal of the 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 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 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 CWDM filter outputs one or more Z-band signals in the third wavelength range to the third pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the third reflective terminal. Wavelength band combining and separating device. The method of claim 28, The first pass terminal of the first edge filter is connected to the third reflective terminal of the CWDM filter, The first reflective terminal of the first edge filter is connected to the second reflective terminal of the second edge filter, The second pass terminal of the second edge filter is connected to the third common terminal of the 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 CWDM filter outputs one or more Z-band signals in the third wavelength range to the third reflection terminal and outputs signals in wavelength bands outside the third wavelength range to the third pass terminal. Wavelength band combining and separating device. The method of claim 28, The first pass terminal of the first edge filter is connected to the third pass terminal of the CWDM filter, The first reflective terminal of the first edge filter is connected to the second reflective terminal of the second edge filter, The second pass terminal of the second edge filter is connected to the third common terminal of the 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 CWDM filter outputs one or more Z-band signals in the third wavelength range to the third pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the third reflective terminal. Wavelength band combining and separating device. The method according to any one of claims 28 to 30, And a filter for passing a Z-band between the first edge filter and the CWDM filter to reduce the effect of crosstalk in the X-band on the Y-band and the Z-band. The method of claim 31, wherein The Z-band passing filter is a wavelength band combining and separation device implemented as a CWDM filter or a band-pass filter (BPF). The method according to any one of claims 25 to 30, And the X-band is any one of an X1-band and an X2-band, and the X1-band and the X2-band are each part of a wavelength band of an O-band. The method according to any one of claims 25 to 30, Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, and said third wavelength is any one or both of 1260-1280 and 1300-1320 nm. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any one input / output terminal of the three input / output terminals is composed of an edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light, The remaining two input / output terminals of the three input / output terminals each include: a first CWDM filter for separating one or more Z-bands of the third wavelength range within an X-band below the first wavelength; And a second CWDM filter separating one or more Z-bands of the third wavelength range within an X-band below the first wavelength, In order to reduce the influence of crosstalk in the X-band on the Y-band and the Z-band, a filter for passing the Y-band is positioned between the first CWDM filter and the edge filter. Wavelength band combining and separating device. The method of claim 35, wherein The Y-band passing filter is a wavelength band combining and separation device implemented as an edge filter or a band-pass filter (BPF). The method of claim 35, wherein The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The first pass terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The third reflective terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second reflecting terminal, outputs a signal in a wavelength band outside the third wavelength range to the second pass terminal, The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Output to the third pass terminal Wavelength band combining and separating device. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any one input / output terminal of the three input / output terminals is composed of an edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light, The remaining two input / output terminals of the three input / output terminals each include: a first CWDM filter for separating one or more Z-bands of the third wavelength range within an X-band below the first wavelength; And a second CWDM filter separating one or more Z-bands of the third wavelength range within an X-band below the first wavelength, The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The first reflective terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The third reflective terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the second reflective terminal, The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Output to the third pass terminal Wavelength band combining and separating device. The method of claim 38, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The first pass terminal of the first CWDM filter is connected to the third reflective terminal of the edge filter, The third pass terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second reflecting terminal, outputs a signal in a wavelength band outside the third wavelength range to the second pass terminal, The edge filter outputs an X-band signal below the first wavelength to the third pass terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Output to the third reflective terminal Wavelength band combining and separating device. The method of claim 38, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The first reflective terminal of the first CWDM filter is connected to the third reflective terminal of the edge filter, The third pass terminal of the edge filter is connected to the second common terminal of the second CWDM filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals in the third wavelength range to the second pass terminal, and outputs signals in wavelength bands outside the third wavelength range to the second reflective terminal, The edge filter outputs an X-band signal below the first wavelength to the third pass terminal among the wavelength bands of the transmitted light input to the third common terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Output to the third reflective terminal Wavelength band combining and separating device. The method of claim 35, wherein The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first reflective terminal of the first CWDM filter is connected to the third reflective terminal of the edge filter, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The second reflective terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals 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 is outside the third wavelength range. Outputs a signal in a wavelength band to the second reflecting terminal; The edge filter outputs an X-band signal below the first wavelength to the third pass terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Wavelength band combining and separating device. A wavelength band combining and separating device having three input / output terminals for bidirectional communication, Any one input / output terminal of the three input / output terminals is composed of an edge filter separating the X-band below the first wavelength and the Y-band above the second wavelength among the wavelength bands of the transmitted light, The remaining two input / output terminals of the three input / output terminals each include: a first CWDM filter for separating one or more Z-bands of the third wavelength range within an X-band below the first wavelength; And a second CWDM filter separating one or more Z-bands of the third wavelength range within an X-band below the first wavelength, The first CWDM filter has a first common terminal, a first reflective terminal, and a first pass-through terminal, The second CWDM filter has a second common terminal, a second reflective terminal, and a second pass terminal, The edge filter includes a third common terminal, a third reflective terminal, and a third pass-through terminal, The first pass terminal of the first CWDM filter is connected to the third reflecting terminal of the edge filter, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The second pass terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal and is outside the third wavelength range. Outputs a signal in a wavelength band to the second pass terminal; The edge filter outputs an X-band signal below the first wavelength to the third pass terminal, and outputs a Y-band signal above the second wavelength to the third reflection terminal. Wavelength band combining and separating device. The method of claim 42, wherein The first reflective terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The first pass terminal of the first CWDM filter is connected to the second pass terminal of the second CWDM filter, The second reflective terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals in the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal, to the first pass terminal, and out of the third wavelength range. Outputs a signal in a wavelength band to the first reflective terminal; The second CWDM filter outputs one or more Z-band signals 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 is outside the third wavelength range. Outputs a signal in a wavelength band to the second reflecting terminal; The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Wavelength band combining and separating device. The method of claim 42, wherein The first pass terminal of the first CWDM filter is connected to the third pass terminal of the edge filter, The first reflective terminal of the first CWDM filter is connected to the second reflective terminal of the second CWDM filter, The second pass terminal of the second CWDM filter is connected to the third common terminal of the edge filter, The first CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the first common terminal to the first reflective terminal, and outputs a signal other than the third wavelength range. Outputs a signal in a wavelength band to the first pass-through terminal, The second CWDM filter outputs one or more Z-band signals of the third wavelength range among the wavelength bands of the transmitted light input to the second common terminal to the second reflecting terminal and is outside the third wavelength range. Outputs a signal in a wavelength band to the second pass terminal; The edge filter outputs an X-band signal below the first wavelength to the third reflection terminal, and outputs a Y-band signal above the second wavelength to the third pass terminal. Wavelength band combining and separating device. The method according to any one of claims 38 to 40 and 42 to 44, And a filter for passing a Y-band between the first CWDM filter and the edge filter to reduce the effect of crosstalk in the X-band on the Y-band and the Z-band. The method of claim 45, The Y-band passing filter is a wavelength band combining and separation device implemented as an edge filter or a band-pass filter (BPF). The method according to any one of claims 35 to 44, And the X-band is any one of an X1-band and an X2-band, and the X1-band and the X2-band are each part of a wavelength band of an O-band. The method according to any one of claims 35 to 44, Wherein said first wavelength is 1360 nm, said second wavelength is 1415 nm, and said third wavelength is any one or both of 1260-1280 and 1300-1320 nm.

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