KR20040056945A - Add/Drop Multiplexer having multiple input/output ports and plural filters - Google Patents

Abstract

PURPOSE: A multi-input/output optical transmission line and an optical insertion extractor having plural filters are provided to transmit and receive optical signals of multiple channels by controlling a characteristic of a filter having the multi-input/output optical transmission line. CONSTITUTION: An optical insertion extractor includes a first optical focusing unit, a second optical focusing unit, and a plurality of filters. The first optical focusing unit(210) includes a first optical transmitter having a first optical transmission line and a second optical transmission line and a first lens. The second optical focusing unit(220) includes a second optical transmitter having a third optical transmission line and a fourth transmission line and a second lens. The filters(230-250) are used for transmitting or reflecting selectively optical signals of the first transmission line. The filters are arranged between the first and the second lenses.

Description

Add / Drop Multiplexer having multiple input / output ports and plural filters}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical insert extractor, and more particularly, to an optical insert extractor having multiple input / output optical transmission paths for transmitting optical signals of multiple channels in a wavelength division multiplexing scheme.

In parallel with the development of science and technology, modern society is actively researching communication technology to realize high-capacity, high-speed optical communication network. In particular, research to implement a low-cost optical subscriber network is needed to realize FTTH (Fiber-To-The-Home), which is an example of a high speed optical communication network.

As a key technology for realizing low-cost optical subscriber network, bidirectional transmission / reception module has been in the spotlight, and this includes time division multiplexing (TDM) method or wavelength division multiplexing (hereinafter referred to as 'TDM'). WDM ') and the like are used.

The TDM method divides a time zone and transmits a transmission signal and a reception signal through a single mode optical fiber in different time slots. The TDM method has a disadvantage in that the signal processing speed is halved because the transmission and reception are divided into different time zones.

On the other hand, the WDM method is a multiplexing method using a plurality of communication channels in one transmission line. That is, the WDM transmits signals having different wavelengths through one transmission line, and the receiving side separates the transmitted signals into signals according to respective wavelengths.

In detail, this WDM method integrates a laser diode that transmits an optical signal, an optical waveguide device, a photo diode that receives an optical signal, and uses two wavelengths of 1,310 nm and 1,550 nm. It is a method of transmitting and receiving a transmission signal and a reception signal.

Optical communication using the WDM method is composed of an optical cable connecting the MUX / DeMUX and the like, as shown in FIG. At this time, an optical signal may be transmitted or added between MUX and DeMUX. What is needed for this add / drop is OADM (Optical Add / Drop Multiplexer). OADM requires more than one pair of Add / Drop Multiplexers (ADM) on the same channel, and generally consists of two ADMs on the same channel.

However, in the conventional wireless mobile communication, the optical communication system using ADM should be provided with a large number of ADMs to transmit and receive multi-channel optical signals other than 1,310 nm and 1,550 nm. The problem is that the losses increase.

An object of the present invention is to provide an optical insertion extractor having multiple input / output optical transmission paths, which is capable of transmitting and receiving optical signals of multiple channels by adjusting characteristics of a filter provided therein.

1 is a schematic diagram showing a configuration of an optical communication for transmitting and receiving a conventional optical signal,

2 is a view schematically showing a 3-2 port optical insert extractor according to a first preferred embodiment of the present invention;

3 is a view schematically illustrating a first pigtail provided in FIG. 1;

4 is a view schematically showing a 3-1 port optical insert extractor according to a second preferred embodiment of the present invention;

5 is a view schematically showing a 2-2 port optical insert extractor according to a third embodiment of the present invention, and

FIG. 6 schematically illustrates an optical communication system using the 3-2 port optical insert extractor shown in FIG. 2.

In order to solve the above technical problem, a first light converging device having at least one first optical path and a second optical path for transmitting an optical signal and a first lens; A second light concentrator having at least one third optical line and a fourth optical line for transmitting the optical signal, and a second optical focusing unit having a second lens; And at least three filters for selectively transmitting and / or reflecting an optical signal incident to the first light beam from the optical transmitter, wherein the at least three filters are spaced apart by a predetermined distance between the first and second lenses. The first and second lenses are sequentially provided, and focus the input optical signal into linear light.

On the other hand, to solve the above technical problem, the optical insertion extractor according to the present invention, the first optical transmission unit having at least one first optical path and the second optical path for transmitting an optical signal and the first having a first lens Optical focusing device; A second light concentrator having at least one third optical line and a fourth optical line for transmitting the optical signal, and a second optical focusing unit having a second lens; A first filter which transmits an optical signal corresponding to the first wavelength region among the optical signals incident to the first light beam from the optical transmitter and reflects other optical signals; A second filter which transmits an optical signal corresponding to a second predetermined wavelength region among the optical signals transmitted through the first filter and reflects other optical signals; And a third filter of the optical signals transmitted through the second filter, the optical signal corresponding to the third wavelength region, and reflecting the other optical signals, wherein the first to third filters The first and second lenses are sequentially spaced apart from each other by a predetermined distance, and the first and second lenses focus the received optical signal with linear light.

More specifically, the first optical path is one input optical path, the second optical path is two output optical paths, and the third optical path is one input optical path and the fourth optical path is one output optical path. The second to fourth optical paths may receive and transmit an optical signal having a predetermined wavelength band from an external source.

In addition, the first wavelength region preset in the first filter and the third wavelength region preset in the third filter are the same, and the first wavelength region preset in the first filter is applied to the second filter. And the set second wavelength region.

The first and second optical transmission unit, Ferrule (Perrule) through which the at least one input optical path and the output optical path is disposed through the formed through hole; And a fixing member for fixing the at least one input optical line and the output optical line to the ferrule, wherein each of the phototransmitting elements is disposed to be in contact with each other.

Preferably, one end surfaces of the first and second light transmission units are formed perpendicular to the longitudinal direction of the first and second light concentrators, and the other end surfaces of the first and second light transmission units are formed of the first and second light transmission units. It is formed to have a predetermined angle with respect to the plane perpendicular to the longitudinal direction of the two-light focusing apparatus, one end surface of the first and second lens is disposed in parallel with the other end surface of the first and second light transmission.

On the other hand, to solve the above technical problem, the optical insertion extractor according to the present invention, the first optical transmission unit having at least one first optical path and the second optical path for transmitting an optical signal and the first having a first lens Optical focusing device; A second light concentrating device having a second light transmission unit having at least one third light path for transmitting the optical signal and a second lens; A first filter which transmits an optical signal corresponding to a predetermined first wavelength region and reflects other optical signals among the optical signals incident from the optical transmitter into the first optical path; And a second filter, which transmits an optical signal corresponding to a second predetermined wavelength region among the optical signals transmitted through the first filter and reflects other optical signals, wherein the first and second filters are predetermined. The first and second lenses are sequentially disposed to be spaced apart from each other, and the first and second lenses focus the received optical signal with linear light.

More specifically, the first optical path is one input optical path, the second optical path is two output optical paths, the third optical path is one output optical path, and the second to the third optical paths have a predetermined wavelength. It is possible to receive and transmit an optical signal having a band from the outside.

On the other hand, to solve the above technical problem, the optical insertion extractor according to the present invention, the first optical transmission unit having at least one first optical path and the second optical path for transmitting an optical signal and the first having a first lens Optical focusing device; A second light concentrating device having a second light transmission unit having at least one third light path and a fourth light path for transmitting the optical signal, and a second lens; A first filter which transmits an optical signal corresponding to a predetermined first wavelength region and reflects other optical signals among the optical signals incident from the optical transmitter into the first optical path; And a second filter, which transmits an optical signal corresponding to a second predetermined wavelength region among the optical signals transmitted through the first filter and reflects other optical signals, wherein the first and second filters are predetermined. The first and second lenses are sequentially disposed to be spaced apart from each other, and the first and second lenses focus the received optical signal with linear light.

More specifically, the first and third optical paths are one input optical path, the second and fourth optical paths are one input optical path, and the second and fourth optical paths have a predetermined wavelength band. The optical signal can be received from the outside and transmitted.

In addition, the first wavelength region and the second wavelength region are the same.

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

2 is a view schematically showing a 3-2 port optical insert extractor according to an embodiment of the present invention.

The 3-2 port optical insert extractor 200 according to the present invention is a bidirectional communication module that transmits an optical signal according to a wavelength characteristic of the optical signal, and is a general ADM.

Referring to FIG. 2, the 5-port optical insertion extractor 200 according to the present invention includes a first light concentrator 210, a second light concentrator 220, and first to third filters 230, 240, and 250. ) And a housing 260. In the present invention, three first to third filters 230, 240, and 250 are provided, but three or more may be provided. In addition, the input optical paths 212a and 222a which will be described later are shown by a dashed line, the output optical paths 212b and 212c by a double-dotted line, and the optical paths are shown by solid lines.

The first optical focusing apparatus 210 includes a first optical transmission unit (hereinafter, 'first pig') having one input optical path 212a applied to the first optical path and two output optical paths 212b and 212c applied to the second optical path. A tail '212 and a first lens 214.

The second optical focusing apparatus 220 has a second optical transmission unit (hereinafter referred to as 'second pigtail') having one input optical line 222a applied to the third optical line and one output optical line 222b applied to the fourth optical line. 222 and the second lens 224.

Each of the input optical paths 212a and 222a and the output optical paths 222b, 222c, and 222b are made of optical fibers. In addition, the first and second light concentrator transmission units 210 and 220 are symmetrically disposed about the first to third filters 230, 240 and 250 which will be described later.

The first and second lenses 214 and 224 are lenses for focusing and outputting optical signals inputted to the first and second lenses 214 and 224 as linear light, including aspherical lenses and green-index lenses. : GRIN lens), Ball lens, Plano lens, Spherical lens, etc. are used.

FIG. 3 is a view schematically illustrating a first pigtail provided in FIG. 1.

For convenience of description, only the first pigtail 212 is described as an example, and the second pigtail 222 has a similar configuration to that of the first pigtail 212, but only the number of output optical lines 222b is different.

Referring to FIG. 3, the first pigtail 212 has a ferrule 213, an input optical path 212a and an output optical path 212b and 212c. The ferrule 213 has one through hole 213a therein. The through hole 213a is formed in the longitudinal direction of the paral 213, and the cross section of the paral 213 in the longitudinal direction has various shapes such as a circle and a polygon. In addition, the through hole 213a is fixedly inserted into the through hole 213a by the fixing member (not shown) such as the input optical path 212a and the output optical paths 412b and 212c.

Then, one end surface of the fixed ferrule 213 is polished diagonally to have a predetermined angle as shown in FIG. At the time of polishing, grind to have a constant inclination with respect to the direction perpendicular to the longitudinal direction of the ferrule 213, the grind portion is polished and coated. As a result, the first pigtail 212 is formed.

Referring back to FIG. 2, when assembling the first pigtail 212 and the first lens 214, the focal size of the light varies according to the distance and angle of the first pigtail 212 and the first lens 214. . In addition, in order to prevent the light incident on the input optical paths 212a and 222a of the first pigtail 212 from being reflected and re-entered, one end surface of the first pigtail 212 and the first lens 214. Is polished with diagonal lines to have a constant angle θ, and installed so that the two diagonal lines are parallel. For example, one end surfaces of the first pigtail 212 and the first lens 214 may have an inclination angle θ of 8 °.

When the inclination angle θ and the focal length are matched, the first pigtail 212 and the first lens 214 are fixed by epoxy curing. The first to third filters 230, 240, and 250 which allow light to be reflected and / or transmitted in response to the fixed first pigtail 212 and the first lens 214 are fixed by epoxy curing or UV curing. . In addition, the first optical connection device 210 is fixed by soldering.

The fixing of the second pigtail 222, the second lens 224, and the second optical connecting device 220 may be performed by the first pigtail 212, the first lens 214, and the first optical connecting device. Same as the fixing method of (210). In addition, the housing 260 for the first and second optical connection devices 210 and 220 and the first to third filters 230, 240 and 250 may be bonded, soldered or laser welded by epoxy. welding) and the like, and thereby the 5-port optical insertion extractor 200 is made.

The first to third filters 230, 240, and 250 may be disposed between the first and second lenses 214 and 224 spaced apart from each other by a predetermined distance.

The first to third filters 230, 240, and 250 are disposed to have a predetermined angle with respect to the vertical direction of the first and second optical connection devices 210 and 220 in the longitudinal direction.

The first to third filters 230, 240, and 250 selectively transmit or reflect the focused optical signal according to the wavelength or frequency characteristic set in the first to third filters 230, 240, and 250.

In detail, the first filter 230 transmits the optical signal corresponding to the predetermined wavelength region among the optical signals incident through the predetermined input optical path 212a and the first lens 214 and the other light. The signal has the property of reflecting.

The second filter 240 transmits an optical signal corresponding to the second wavelength region among the optical signals transmitted through the first filter 230 and reflects other optical signals.

The third filter 250 transmits the optical signal corresponding to the third wavelength region among the optical signals transmitted through the second filter 240 and reflects the other optical signals.

Here, it is preferable that the first wavelength region preset in the first filter 230 and the third wavelength region preset in the third filter 250 are the same.

Hereinafter, the path of the optical signal of the 5-port optical insertion extractor 200 will be described with reference to FIG. 2. In the present invention, an optical signal having a wavelength range of 1250 nm to 1650 nm will be described as an example, and the case of increasing the number of channels by a coarse wave-length-division multiplexing (CWDM) method will be described. For example, in the CWDM method, the wavelength range of 1250 nm to 1650 nm is 1,310 nm in the 1.3 um wavelength band and 1,470 nm, 1,490 nm, 1,510 nm, 1,530 nm in the 1.4 um to 1.5 um wavelength band. , 1,550nm, 1570nm, 1590nm and 1610nm wavelengths.

An optical signal having a predetermined wavelength band (1250 nm to 1650 nm) incident on the first lens 214 via the input optical path 212a is focused by the first lens 214 to the first filter 230.

The first filter 230 transmits wavelengths of 1,460 nm to 1,620 nm and reflects other wavelengths, that is, wavelengths of 1,290 nm to 1,330 nm. As a result, only 1,460 nm to 1,620 nm wavelength of the optical signal focused on the first filter 230 passes through the first filter 230 and is incident to the second filter 240, and the wavelength of 1,290 nm to 1,330 nm is Reflected by the output optical path 212c.

The second filter 240 transmits 1,542 nm to 1,558 wavelengths and reflects other wavelengths, that is, wavelengths of 1,460 nm to 1,538 nm and 1,562 nm to 1,620 nm. As a result, only 1,542 nm to 1,558 wavelengths of the optical signals transmitted through the first filter 230 pass through the second filter 240 and are incident to the third filter 250, and 1,460 nm to 1,538 nm and 1,562 nm. The wavelength of ˜1,620 nm is reflected to the output optical path 212b.

The third filter 250 has the same characteristics as the first filter 230. As a result, the wavelengths 1,542 nm to 1,558 that pass through the second filter 240 pass through the third filter 250 and enter the output light path 222b.

In addition, the wavelengths 1,290 nm to 1,330 nm that are reflected by the second filter 240 and incident on the output optical path 212c are again incident on the input optical path 222a and reflected by the third filter 250, and then output beams. It enters into furnace 222b.

As described above, when the optical signal is transmitted by the CWDM method by providing two 3-2 port optical insert extractors 200, the conventional two-channel wide wavelength-division multiplexing (WWDM) method can be used. Channel increases for seven wavelengths (eg, 1,470 nm, 1,490 nm, 1,510 nm, 1,530 nm, 1,570 nm, 1,590 nm and 1,610 nm wavelengths) except 1310 nm and 1550 nm are possible. In this case, two output optical lines 212b and 212c, one input optical line 222a and one output optical line 222b applied to the second to fourth optical lines are among the wavelength bands of 1,250 nm to 1,650 nm. An optical signal having a predetermined wavelength band may be received from an external light insertion extractor (not shown) and transmitted.

In addition, when the seven channels are expanded by the CWDM method using the optical insertion extractor 200 of FIG. 2, the insertion loss generated is about 1 dB or less in the case of 1,310 nm wavelength and 1,550 nm wavelength.

4 is a view schematically illustrating a 3-1 port optical insert extractor according to a second preferred embodiment of the present invention.

Referring to FIG. 4, the 3-1 port optical insertion extractor 400 includes a first light concentrator 410, a second light concentrator 420, first and second filters 430 and 440, and a housing 450. Has In addition, the input optical lines 412a and 422a to be described later are shown by a dashed line, the output optical lines 412b and 412c by a double-dotted line, and the optical paths are shown by solid lines.

In addition, the first light concentrator 410, the second light concentrator 420, and the housing 450 illustrated in FIG. 4 may include the first light concentrator 210 and the second light concentrator (FIG. 2). 220 and the housing 260 has the same structure and characteristics, so a detailed description thereof will be omitted.

The first optical focusing apparatus 410 has a first optical transmission unit 412 and a first having an input optical path 412a applied as the first optical path and two output optical paths 412b and 412c applied as the second optical path. Has a lens 414.

The second light focusing apparatus 420 has a second light transmission unit 422 and a second lens 424 having one output light path 422a applied to the third light path.

The first and second filters 430 and 440 are disposed between the first and second lenses 414 and 414 at a predetermined distance apart. The first and second filters 430 and 440 selectively transmit or reflect the focused optical signal according to the wavelength or frequency characteristic set in the first and second filters 430 and 440.

In detail, the first filter 430 transmits an optical signal corresponding to the predetermined wavelength region among the optical signals incident through the predetermined input optical path 412a and the first lens 414, and the other. The optical signal has a property of reflecting.

The second filter 440 transmits an optical signal corresponding to the second wavelength region among the optical signals transmitted through the first filter 430 and reflects other optical signals.

Hereinafter, the path of the optical signal of the 3-1 port optical insertion extractor 400 will be described with reference to FIG. 4. In the present invention, the CWDM optical signal wavelength region, that is, a wavelength region of 1250 nm to 1650 nm will be described as an example.

An optical signal having a predetermined wavelength band (1250 nm to 1650 nm) incident on the first lens 414 via the input optical path 412a is focused by the first lens 414 to the first filter 430.

The first filter 430 transmits wavelengths of 1,460 nm to 1,620 nm and reflects other wavelengths, that is, wavelengths of 1,290 nm to 1,330 nm. As a result, of the optical signals focused on the first filter 430, only 1,460 nm to 1,620 nm wavelengths pass through the first filter 430 and are incident to the second filter 440, and the wavelengths of 1,290 nm to 1,330 nm are Reflected by the output optical path 412c.

The second filter 440 transmits 1,542 nm to 1,558 wavelengths and reflects other wavelengths, that is, wavelengths of 1,460 nm to 1,538 nm and 1,562 nm to 1,620 nm. As a result, only 1,542 nm to 1,558 wavelengths of the optical signals transmitted through the first filter 430 pass through the second filter 440 to be incident on the output optical path 422a, and 1,460 nm to 1,538 nm and 1,562 nm. The wavelength of ˜1,620 nm is reflected by the output optical line 412b.

When the optical channel is increased by using the above-described 3-1 port optical insert extractor 400 and at least one 2-1 port optical insert extractor not shown, the second optical filter 440 reflects the output optical path 412c. The 1,290 nm to 1,330 nm wavelengths incident on the light beams are incident on a predetermined port (that is, a predetermined input optical path (not shown)) of the 2-1 port optical insertion extractor (not shown). In this case, the three output optical paths 412b, 412c, and 422a applied to the second and third optical paths may output an optical signal having a predetermined wavelength band from 1,250 nm to 1,650 nm in a 2-1 port optical insert extractor ( It can be received from the transmission).

5 is a view schematically showing a 2-2 port optical insertion extractor according to a third embodiment of the present invention.

Referring to FIG. 5, the 2-2 port optical insert extractor 500 includes a first light concentrator 510, a second light concentrator 520, first and second filters 530 and 540, and a housing 550. Has In addition, the input optical lines 512a and 522a which will be described later are shown by a dashed line, the output optical lines 512b and 522b are shown by double-dotted lines, and the optical paths are shown by solid lines.

In addition, the first light concentrator 510, the second light concentrator 520, and the housing 550 illustrated in FIG. 5 may include the first light concentrator 210 and the second light concentrator (FIG. 2). 220 and the housing 260 has the same structure and characteristics, so a detailed description thereof will be omitted.

The first optical focusing apparatus 510 includes a first optical transmission unit 512 and a first optical path including a single input optical path 512a applied to the first optical path and two output optical paths 512b and 412c applied to the second optical path. Has a lens 514.

The second light concentrator 520 may include a second light transmission unit 522 and a second lens having one input light path 522a applied to the third optical path and one output light path 522b applied to the fourth optical path. 524).

The first and second filters 530 and 540 are positioned between the first and second lenses 514 and 524 at a predetermined distance apart. The first and second filters 530 and 540 selectively transmit or reflect the focused optical signal according to the wavelength or frequency characteristic set in the first and second filters 530 and 540.

In detail, the first filter 530 transmits the optical signal corresponding to the predetermined wavelength region among the optical signals incident through the predetermined input optical path 512a and the first lens 514, and the other. The optical signal has a property of reflecting.

The second filter 540 has the same characteristics as the first filter 530.

Hereinafter, the path of the optical signal of the 2-2 port optical insertion extractor 500 will be described with reference to FIG. 5. In the present invention, the CWDM optical signal wavelength region, that is, a wavelength region of 1250 nm to 1650 nm will be described as an example.

An optical signal having a predetermined wavelength band (1250 nm to 1650 nm) incident on the first lens 514 via the input optical path 512a is focused by the first lens 514 to the first filter 530.

The first filter 530 and the second filter 540 transmit a wavelength of 1,290 nm to 1,330 nm and reflect other wavelengths, that is, wavelengths of 1,460 nm to 1,620 nm. As a result, only 1,290 nm to 1,330 nm wavelengths of the optical signals focused on the first filter 530 pass through the first filter 530 and the second filter 540 and enter the output optical path 522b. The wavelength of 1460 nm to 1620 nm is reflected to the output optical line 512b.

Furthermore, when the optical channel is increased by using the above-described 2-2 port optical insert extractor 500 and at least one 2-1 port optical insert extractor (not shown), 1,460 nm to 1,620 incident to the output optical path 512b. The nm wavelength is incident on a predetermined port (i.e., a predetermined input optical path (not shown)) of the 2-1 port optical insertion extractor (not shown), and then is again output from the output optical path 522b by the second filter 540. Reflected to the channel contributes to the increase of the optical channel. In this case, the two output optical paths 512b and 522b applied to the second and fourth optical paths may output optical signals having a predetermined wavelength band from 1,250 nm to 1,650 nm in a 2-1 port optical insert extractor (not shown). ) Can be received and sent.

FIG. 6 schematically illustrates an embodiment of an optical communication system using the 3-2 port optical insert extractor shown in FIG. 2.

2 and 6, the optical communication system 600 according to the present invention includes a plurality of laser diodes (hereinafter referred to as "LD") (1, 3 to 6, 11, 13 to 15), and a plurality of laser diodes. Photo diodes (hereinafter referred to as "PD") (2, 7 to 9, 12, 16 to 19), first light insert extractor 610, second light insert extractor 620, first MUX / DeMUX ( 630, a third light insertion extractor 640, a fourth light insertion extractor 650, and a second MUX / DeMUX 660.

The first light insert extractor 610, the second light insert extractor 620, the third light insert extractor 640, and the fourth light insert extractor 650 are ADMs, which are bidirectional communication modules, which are illustrated in FIG. 2. Since it has a structure and characteristics similar to the two-port optical insertion extractor 200, detailed description thereof will be omitted.

In more detail, the first and third light insertion extractors 610 and 640 are modules applied to a WWDM communication method for selectively transmitting or reflecting a plurality of wavelengths having a wavelength range difference of 200 nm. In addition, the first light insert extractor 610 has 2-1 ports (a, b, c) and one filter 612, and the third light insert extractor 640 has 2-1 ports (g, h, i) and one filter 642.

In addition, the second and fourth light insertion extractors 620 and 650 selectively transmit or reflect a plurality of wavelengths having a wavelength range difference of 20 nm. The second light insertion extractor 620 is the same as the light insertion extractor 200 shown in FIG. 2, and has 3-2 ports (a, d, e, f) and three filters 622, 624, and 626. The fourth light insertion extractor 650 has 3-2 ports f, i, j and k and three filters 652, 654 and 656.

The LD 1 transmits an optical signal having a wavelength of 1,550 nm to the port a of the first optical insert extractor 610, and the LD 11 transmits an optical signal having a wavelength of 1,310 nm to the third optical insert extractor. Transmit to port g of 630.

The first MUX / DeMUX 630 is connected to an LD shown at 3 to 6 transmitting optical signals of different wavelengths and a PD shown at 7 to 9 receiving optical signals of different wavelengths. For example, the second and fourth light insertion extractors 620 and 650 are modules applied to a CWDM communication method, and the LD 3 is an optical signal of 1,470 nm and the LD 4 is an optical signal of 1,490 nm. When the LD 5 transmits an optical signal of 1,510 nm and the LD 6 transmits an optical signal of 1,530 nm, the first MUX / DeMUX 630 receives an optical signal of each wavelength from the LD shown in 3 to 6. It transmits to the input optical path (e). In addition, the first MUX / DeMUX 630 transmits 1,570 nm, 1,590 nm, and 1,610 nm optical signals transmitted through the input optical path e to the PDs shown in FIGS.

The second MUX / DeMUX 660 is connected to an LD shown at 13 to 15 transmitting optical signals of different wavelengths and a PD shown at 16 to 19 receiving optical signals of different wavelengths. For example, the second and fourth light insertion extractors 620 and 650 are modules applied to the CWDM communication method, and the LD 13 receives an optical signal of 1,570 nm and the LD 14 receives an optical signal of 1,590 nm. When the LD 15 transmits an optical signal of 1,610 nm, the first MUX / DeMUX 630 transmits an optical signal of each wavelength from the LD shown in 13 to 15 to the input optical path j. In addition, the second MUX / DeMUX 660 transmits 1,470 nm, 1,490 nm, 1,510 nm, and 1,530 nm optical signals transmitted through the input optical line k to the PDs shown in 16 to 19, respectively.

Referring to FIG. 6, the optical signal transmission path in the optical communication system is as follows.

The filter 612 transmits an optical signal having a wavelength of 1,310 nm and reflects an optical signal having a wavelength of 1,550 nm. As a result, an optical signal having a wavelength of 1,550 nm that is incident from the LD 1 through the input optical path a to the first light extractor 610 is reflected by the filter 612 and thus the second light extractor 620 It passes through the filters 622, 624, 626 through the input optical path (c). The optical signal having a wavelength of 1,550 nm that passes through the filter 626 passes through the filters 652, 654, and 656 sequentially through the output optical path f, and then passes through the input optical path i to filter 642. Through). As a result, an optical signal having a wavelength of 1,550 nm is received by the PD 12 through the output optical line h.

The filter 622 transmits wavelengths of 1,460 nm to 1,620 nm and reflects other wavelengths, that is, wavelengths of 1,290 nm to 1,330 nm. The filter 624 transmits 1,542 nm to 1,558 wavelengths and reflects other wavelengths, that is, wavelengths of 1,460 nm to 1,538 nm and 1,562 nm to 1,620 nm. The third filter 626 has the same characteristics as the first filter 624.

As a result, the optical signal having a wavelength of 1,550 nm focused on the filter 622 passes through the filter 622, the filter 624, and the filter 626 and is reflected by the output optical path f.

In addition, optical signals having wavelengths of 1,470 nm, 1,490 nm, 1,510 nm, and 1,530 nm transmitted from the first MUX / DeMUX 630 pass through the filter 626 through the input optical path e and are focused on the filter 624. . In addition, the optical signals having wavelengths of 1,470 nm, 1,490 nm, 1,510 nm, and 1,530 nm that are focused on the filter 624 are reflected by the filter 624 to pass through the output optical path f of the fourth light insert extractor 650. Incident on filter 652.

The filter 652 transmits wavelengths of 1,460 nm to 1,620 nm and reflects other wavelengths, that is, wavelengths of 1,290 nm to 1,330 nm. The filter 654 transmits 1,542 nm to 1,558 wavelengths, and reflects other wavelengths, that is, wavelengths of 1,460 nm to 1,538 nm and 1,562 nm to 1,620 nm. The third filter 656 has the same characteristics as the first filter 652.

Accordingly, the optical signals having wavelengths of 1,470 nm, 1,490 nm, 1,510 nm, 1,530 nm, and 1,570 nm incident on the filter 652 pass through the filter 652 and are reflected by the filter 654 to be output through the output optical path k. Is incident to the second MUX / DeMUX 660. Each of the optical signals having wavelengths of 1,470 nm, 1,490 nm, 1,510 nm, and 1,530 nm is incident on the PDs shown at 16 to 19.

Further, the optical signals having wavelengths of 1,570 nm, 1,590 nm, and 1,610 nm transmitted from the LD shown in 13 to 15 are incident by the second MUX / DeMUX 660 through the output optical path k to the filter 652. The optical signals having wavelengths of 1,570 nm, 1,590 nm, and 1,610 nm are transmitted through the filter 652 and then reflected by the filter 654 to enter the filter 626 through the output optical path f.

The optical signals having the wavelengths of 1,570 nm, 1,590 nm, and 1,610 nm incident on the filter 626 are reflected by the filter 624 and incident on the first MUX / DeMUX 630, respectively, by the first MUX / DeMUX 630. It is incident on the PD shown at 9.

On the other hand, the filter 642 reflects an optical signal having a wavelength of 1,310 nm and transmits an optical signal having a wavelength of 1,550 nm. As a result, an optical signal having a wavelength of 1,310 nm incident on the third light insertion extractor 640 through the input optical line g from the LD 11 is reflected by the filter 642 and the fourth light insertion extractor 650. Is incident on the filter 656 via the input optical path i of?.

The optical signal having a wavelength of 1,310 nm focused on the filter 656 is reflected by the filter 656 and reflected by the filter 652 via the output optical line j. The reflected optical signal having a wavelength of 1,310 nm is reflected by the filter 626 through the output optical path f, and then reflected by the filter 622 via the output optical path d, and then reflected by the output optical path. The filter 612 passes through (c). An optical signal having a wavelength of 1,310 nm passing through the filter 612 is incident on the PD 2 via the output optical line b.

When optical communication is performed using the optical insertion extractors 620 and 650 of the 3-2 port as described above, an optical signal of many wavelengths, that is, a large number of channels, can be extended even with a smaller number of optical insertion extractors. have. In addition, as the number of light insertion extractors decreases, the number of collimators (that is, the number of light concentrators 210, 220, 410, 420, 510, and 520 shown in FIGS. 2, 4, and 5) decreases. Loss also has a decreasing effect.

In addition, as described above, the optical insertion extractor 200 of the 3-2 port, the optical insertion extractor 400 of the 3-1 port and the optical insertion extractor 500 of the 2-2 port, as well as the optical insertion of the 3-3 port It is also possible to implement an optical communication system using an extractor, and the number of ports is not limited to the number, and may be implemented using an optical insertion extractor (not shown) having a port of 3-3 ports or more.

However, in the case of the 3-3 port optical insert extractor (not shown), at least four filters (not shown) are provided that are different from the 3-2 port optical insert extractor 200, and are transmitted through each filter (not shown). And the wavelength region reflected and the optical signal path are different.

In addition, the optical insertion extractor described above has multiple input / output optical transmission paths, and includes at least two or at least three filters having different wavelength characteristics, thereby contributing to the increase in the number of optical channels, and is not limited to optical communication of CWDM or WWDM. It is also applicable to other optical communication such as Dense Wavelength Division Multiplexing (DWDM).

Although the present invention has been described in detail through the representative embodiments, those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention with respect to the embodiments described above. Will understand. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

According to the optical communication system using the optical insertion extractor according to the present invention, by controlling the wavelength characteristics of the filter provided in the ADM, it is possible to transmit and receive a multi-channel optical signal with only at least one ADM. That is, not only the wavelength of 1,310 nm, but also the wavelength of 1,470 nm, 1,490 nm, 1,510 nm, 1,530 nm, 1,550 nm, 1,570 nm, 1,590 nm and 1,610 nm can be implemented in various ways. In addition, by using the minimum number of optical insertion extractor, it is possible to increase the number of channels while minimizing the occurrence of insertion loss.

Claims (18)

A first light concentrator having at least one first optical path and a second optical path for transmitting an optical signal and a first lens; A second light concentrator having at least one third optical line and a fourth optical line for transmitting the optical signal, and a second optical focusing unit having a second lens; And And at least three filters for selectively transmitting and / or reflecting an optical signal incident to the first light from the optical transmitter. The at least three filters are spaced apart from each other by a predetermined distance, and are sequentially provided between the first and second lenses, and the first and second lenses focus the received optical signal with linear light. . A first light concentrator having at least one first optical path and a second optical path for transmitting an optical signal and a first lens; A second light concentrator having at least one third optical line and a fourth optical line for transmitting the optical signal, and a second optical focusing unit having a second lens; A first filter which transmits an optical signal corresponding to the first wavelength region among the optical signals incident to the first light beam from the optical transmitter and reflects other optical signals; A second filter which transmits an optical signal corresponding to a second predetermined wavelength region among the optical signals transmitted through the first filter and reflects other optical signals; And Among the optical signals transmitted through the second filter, a third filter for transmitting the optical signal corresponding to the predetermined third wavelength region and reflects other optical signals; The first to third filters are sequentially spaced apart from each other by a predetermined distance, and are sequentially provided between the first and second lenses, wherein the first and second lenses focus the received optical signal with linear light. Insertion Extractor. The method of claim 2, Wherein the first optical path is one input optical path, the second optical path is two output optical paths, and the third optical path is one input optical path and the fourth optical path is one output optical path. . The method of claim 3, wherein And the second to fourth optical paths can receive and transmit an optical signal having a predetermined wavelength band from the outside. The method of claim 2, And the first wavelength region preset in the first filter and the third wavelength region preset in the third filter are the same. The method of claim 2, And the first wavelength region preset in the first filter includes the second wavelength region preset in the second filter. The method of claim 2, And the first and third wavelength regions are 1,450 nm to 1,630 nm wavelength regions, and the second wavelength region is 1,542 nm to 1,558 nm wavelength regions. The method of claim 2, The first and second light transmission unit, A ferrule in which the at least one input optical line and the output optical line are disposed through the formed through hole; And And a fixing member configured to fix the at least one input optical line and the output optical line to the ferrule. And each of the phototransmitting elements is arranged to be in contact with each other. The method of claim 2, One end surface of the first and second light transmission units is formed perpendicular to the longitudinal direction of the first and second light concentrators, and the other end surfaces of the first and second light transmitters are the first and second light concentrators. The light insertion extractor is formed to have a predetermined angle with respect to the plane perpendicular to the longitudinal direction of the first and second lenses, the one end surface is disposed in parallel with the other end surface of the first and second light transmission unit. . A first light concentrator having at least one first optical path and a second optical path for transmitting an optical signal and a first lens; A second light concentrating device having a second light transmission unit having at least one third light path for transmitting the optical signal and a second lens; A first filter which transmits an optical signal corresponding to a predetermined first wavelength region and reflects other optical signals among the optical signals incident from the optical transmitter into the first optical path; And Among the optical signals transmitted through the first filter, a second filter for transmitting the optical signal corresponding to the second predetermined wavelength region and reflects other optical signals; The first and second filters are spaced apart a predetermined distance, and are sequentially provided between the first and second lenses, and the first and second lenses focus the received optical signal with linear light. Insertion Extractor. The method of claim 10, And the first optical path is one input optical path, the second optical path is two output optical paths, and the third optical path is one output optical path. The method of claim 11, And the second to the third optical paths can receive and transmit an optical signal having a predetermined wavelength band from the outside. The method of claim 10, The first wavelength region is 1,450nm to 1,630nm wavelength region, the second wavelength region is 1,542nm to 1,558nm wavelength region corresponding to the light insertion extractor. A first light concentrator having at least one first optical path and a second optical path for transmitting an optical signal and a first lens; A second light concentrating device having a second light transmission unit having at least one third light path and a fourth light path for transmitting the optical signal, and a second lens; A first filter which transmits an optical signal corresponding to a predetermined first wavelength region and reflects other optical signals among the optical signals incident from the optical transmitter into the first optical path; And Among the optical signals transmitted through the first filter, a second filter for transmitting the optical signal corresponding to the second predetermined wavelength region and reflects other optical signals; The first and second filters are spaced apart a predetermined distance, and are sequentially provided between the first and second lenses, and the first and second lenses focus the received optical signal with linear light. Insertion Extractor. The method of claim 14, And the first and third optical paths are one input optical path, and the second and fourth optical paths are one input optical path. The method of claim 15, And the second and fourth optical paths can receive and transmit an optical signal having a predetermined wavelength band from the outside. The method of claim 14, And the first wavelength region and the second wavelength region are the same. The method of claim 17, And the first wavelength region and the second wavelength region correspond to a wavelength region of 1,290 nm to 1,330 nm.