KR20010035567A - Optical add-drop multiplexers for wavelength division multiplexed optical communication system - Google Patents

Optical add-drop multiplexers for wavelength division multiplexed optical communication system Download PDF

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KR20010035567A
KR20010035567A KR1019990042199A KR19990042199A KR20010035567A KR 20010035567 A KR20010035567 A KR 20010035567A KR 1019990042199 A KR1019990042199 A KR 1019990042199A KR 19990042199 A KR19990042199 A KR 19990042199A KR 20010035567 A KR20010035567 A KR 20010035567A
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optical
wavelength
output port
coupler
output
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KR100573282B1 (en
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이성은
김광준
이종현
윤지욱
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정선종
한국전자통신연구원
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
    • G02B6/29317—Light guides of the optical fibre type
    • G02B6/29319—With a cascade of diffractive elements or of diffraction operations
    • G02B6/2932—With a cascade of diffractive elements or of diffraction operations comprising a directional router, e.g. directional coupler, circulator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0205—Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0213—Groups of channels or wave bands arrangements

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE: An optical add-drop multiplexer for a Wave Division Multiple optical telecommunications system is provided to vary optical add-drop channels at random, improve the flexibility. CONSTITUTION: In an optical add-drop multiplexer, a first optical coupler(220) divides wave division multiple(WDM) optical signals and sends the divided signals to a first output port(222) and a second output port(223). A fiber bragg grating(241) reflects partial waves of the divided optical signals from the first output port(222) of the first optical coupler(220) and sends the waves to a third output port(224) of the first optical coupler(220). An optical wave combiner produces other optical channels and combines the newly produced channels. A second optical coupler(230) couples the optical signal from the fiber bragg grating(241) and the combined optical channels from the optical wave combiner. A first optical wave selector/divider selects parts of the optical signal from the second output port(223) of the first optical coupler(220) and produces the selected waves as the output. A second optical wave selector/divider selects parts of the optical signal from the third output port(224) of the first optical coupler(220) and produces the selected waves as the output.

Description

파장분할다중 광통신시스템을 위한 광결합 분기 다중화기 {Optical add-drop multiplexers for wavelength division multiplexed optical communication system}Optical add-drop multiplexers for wavelength division multiplexed optical communication system

본 발명은 파장분할다중 광통신시스템을 위한 광결합 분기 다중화기(optical add-drop multiplexer)에 관한 것으로서, 보다 상세하게 설명하면 다중된 광신호의 광경로를 할당하는 광결합 분기 다중화기에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical add-drop multiplexer for a wavelength division multiplexing optical communication system, and more particularly, to an optical coupled branch multiplexer for allocating optical paths of multiplexed optical signals.

파장분할다중 통신시스템은 각 채널이 특정 채널 파장을 할당받는 복수 광신호 채널을 사용한다. 많은 경우에 다중된 광신호 중 일부 채널을 다른 지점으로 전송할 필요가 발생한다. 이러한 형태의 광경로 할당을 일반적으로 광결합 분기 다중화라고 부른다.A wavelength division multiplexing communication system uses a plurality of optical signal channels in which each channel is assigned a specific channel wavelength. In many cases there is a need to transmit some channels of the multiplexed optical signals to other points. This form of optical path assignment is commonly referred to as optical coupling branch multiplexing.

이러한 기능을 수행하는 광결합 분기 다중화기는 B. Sridhar가 발명하고 1998월 7월 7일자로 특허된 미국특허 제5,778,118호에 상세하게 기술되어 있다. 이를 간단하게 살펴보면, 도 1에 도시된 바와 같이 광필터(103)를 통해 연결되는 두 개의 광결합기들(102, 104)을 포함한다. 제1광결합기(102)는 하나의 입력포트와 두 개의 출력포트들을 포함하고, 입력포트로 들어오는 광신호가 두 개의 출력포트들을 통해 나온다. 제2광결합기(104)는 두 개의 입력포트와 하나의 출력포트를 포함하며 두 입력포트로 들어오는 광신호가 결합되어 출력포트를 통과한다.Optically coupled branch multiplexers that perform this function are described in detail in US Pat. No. 5,778,118, which was invented by B. Sridhar and patented July 7, 1998. Briefly, this includes two optical couplers 102 and 104 connected through the optical filter 103 as shown in FIG. 1. The first optical coupler 102 includes one input port and two output ports, and an optical signal coming into the input port is output through the two output ports. The second optical coupler 104 includes two input ports and one output port, and optical signals coming into the two input ports are combined to pass through the output port.

제1광경로는 파장분할다중된 광신호를 전달하기 위해 제1광결합기(102)의 입력포트에 연결된다. 제2광경로는 제1광결합기(102)의 제1출력포트 및 제2광결합기(104)의 제1입력포트 사이에 연결된다. 제2광경로에는 제1광결합기(102)의 출력포트로부터 입력받은 파장분할다중된 광신호의 일부를 선별하기 위한 광필터(103)가 부가되며, 파장분할다중된 광신호 중 제2광결합기(104)의 입력포트로 전달되지 않는 파장은 결합 분기 다중화기에서 출력된다.The first optical path is connected to the input port of the first optical coupler 102 to transmit the wavelength division multiplexed optical signal. The second optical path is connected between the first output port of the first optical coupler 102 and the first input port of the second optical coupler 104. The second optical path is provided with an optical filter 103 for selecting a portion of the wavelength-division multiplexed optical signal received from the output port of the first optical coupler 102, and the second optical coupler among the wavelength-division multiplexed optical signals. Wavelengths that are not transmitted to the input port of 104 are output from the coupled branch multiplexer.

제3광경로는 제1광결합기(102)의 입력포트로 들어오는 파장분할다중된 광신호의 일부를 입력받기 위해 제1광결합기(102)의 제2출력포트에 연결된다. 제3광경로는 파장분할다중된 광신호로부터 광파장을 선별하도록 구성된 파장 선별기(107)에 연결된다. 제4광경로는 WDM 광신호에 결합될 광채널을 전달하기 위해 제2광결합기(104)의 제2입력포트에 연결된다. 이 광채널은 WDM 광신호의 통과 부분과 결합되어 제2광결합기(104)의 출력포트에 연결되는 제5광경로에 새로운 파장분할다중된 광신호로 출력된다.The third optical path is connected to the second output port of the first optical coupler 102 to receive a portion of the wavelength-division multiplexed optical signal that enters the input port of the first optical coupler 102. The third optical path is connected to a wavelength selector 107 configured to select light wavelengths from the wavelength division multiplexed optical signal. The fourth optical path is connected to the second input port of the second optical coupler 104 to deliver the optical channel to be coupled to the WDM optical signal. The optical channel is output as a new wavelength-division multiplexed optical signal to the fifth optical path which is coupled to the pass portion of the WDM optical signal and connected to the output port of the second optical coupler 104.

위에서 설명하였던 B. Sridhar가 제안한 광결합 분기 다중화기는, 저가의 광분파기를 사용하며 분기되는 채널과 결합되는 채널을 임의로 선택할 수 있는 융통성을 가지나, 광채널의 분기를 위해 광분파기와 광채널 필터 등을 사용해야 한다. 이 때문에 이러한 구조의 광결합 분기 다중화기에서는 광분파기의 삽입 손실로 인해 분기 또는 결합되는 채널의 수가 제한되는 문제점이 있었다.The optically coupled branch multiplexer proposed by B. Sridhar, described above, uses a low cost optical splitter and has the flexibility to arbitrarily select the channel combined with the branching channel. do. For this reason, in the optical coupling branch multiplexer having such a structure, there is a problem in that the number of channels branched or coupled is limited due to insertion loss of the optical splitter.

따라서, 본 발명은 상기와 같은 종래기술의 필요성을 충족시키기 위하여 안출된 것으로서, 본 발명의 목적은 다수의 결합 분기 채널수를 갖고, 광채널이 임의로 가변되는 유연한 광결합 분기 다중화기를 제공하기 위한 것이다.Accordingly, an object of the present invention is to provide a flexible optical coupling branch multiplexer having a plurality of coupling branch channels and having an arbitrarily variable optical channel.

도 1은 종래 기술에 따른 광결합 분기 다중화기를 도시한 개략적인 구성도,1 is a schematic block diagram showing an optical coupling branch multiplexer according to the prior art,

도 2는 본 발명의 한 실시 예에 따른 광결합 분기 다중화기를 개략적으로 도시한 구성도,2 is a block diagram schematically illustrating an optically coupled branch multiplexer according to an embodiment of the present invention;

도 3은 본 발명의 다른 실시 예에 따른 광결합 분기 다중화기를 개략적으로 도시한 구성도이다.3 is a block diagram schematically illustrating an optically coupled branch multiplexer according to another embodiment of the present invention.

※ 도면의 주요 부분에 대한 부호의 설명 ※※ Explanation of code about main part of drawing ※

220 : 제1광결합기 230 : 제2광결합기220: first optical coupler 230: second optical coupler

261, 271 : 광분파기 262A, 262B, 272A, 272B : 파장 선별기261, 271: optical splitter 262A, 262B, 272A, 272B: wavelength selector

281A, 281B : 광원 282 : 광합파기281A, 281B: light source 282: light combiner

상기한 목적을 달성하기 위한 본 발명에 따르면, 파장분할다중된 광신호를 입력받아 제1출력포트 및 제2출력포트로 분할하여 출력하는 제1광결합기와; 상기 제1광결합기의 제1출력포트로 출력되는 파장분할다중된 광신호 중 일부파장을 반사하여 상기 제1광결합기의 제3출력포트로 출력하는 광섬유 브래그 격자; 새로이 결합될 광채널들을 발생하여 결합하는 광원 및 광합파기; 상기 광섬유 브래그 격자를 통과한 파장분할다중된 광신호와 상기 광합파기에서 결합된 광채널들을 결합하는 제2광결합기; 상기 제1광결합기의 제2출력포트로 출력되는 파장분할다중된 광신호 중 일부 파장을 선별하여 출력하는 광분파기 및 파장 선별기; 및 상기 제1광결합기의 제3출력포트로 출력되는 파장분할다중된 광신호 중 일부 파장을 선별하여 출력하는 광분파기 및 파장 선별기를 포함한 것을 특징으로 하는 파장분할다중 광전송시스템에서 광결합 분기 다중 장치가 제공된다.According to the present invention for achieving the above object, a first optical coupler for receiving the wavelength-divided multiplexed optical signal divided into a first output port and a second output port; An optical fiber Bragg grating for reflecting a partial wavelength of the wavelength division multiplexed optical signal output to the first output port of the first optical coupler and outputting the wavelength to the third output port of the first optical coupler; A light source and an optical combiner for generating and combining optical channels to be newly combined; A second optical coupler for coupling the wavelength-division multiplexed optical signal passing through the optical fiber Bragg grating and the optical channels coupled in the optical combiner; An optical splitter and a wavelength selector for selecting and outputting some wavelengths among the wavelength-division multiplexed optical signals output to the second output port of the first optical coupler; And an optical splitter and a wavelength divider for selecting and outputting a portion of wavelength-multiplexed optical signals output to the third output port of the first optical coupler. Is provided.

또한, 본 발명에 따르면, 파장분할다중된 광신호를 입력받아 제1출력포트 및 제2출력포트로 분할하여 출력하는 제1광결합기와; 제1입력포트 및 제2입력포트로 입력되는 광신호를 결합하여 출력포트로 출력하는 제2광결합기; 상기 제1광결합기의 제1출력포트로 출력되는 파장분할다중된 광신호 중 일부 파장만을 상기 제2광결합기의 제1입력포트로 통과시키는 광섬유 브래그 격자; 상기 제1광결합기의 제2출력포트로 출력되는 파장분할다중된 광신호 중 일부 광파장을 분리하여 출력하는 가변파장필터; 상기 분리되는 광파장을 조절하기 위하여 상기 가변파장필터를 제어하는 제어수단; 및 새로이 결합될 광채널들을 발생하여 결합한 후 상기 제2광결합기의 제2입력포트로 제공하는 광원 및 광합파기를 포함한 것을 특징으로 하는 파장분할다중 광전송시스템에서 광결합 분기 다중 장치가 제공된다.In addition, according to the present invention, a first optical coupler for receiving the wavelength-divided multiplexed optical signal divided into a first output port and a second output port; A second optical coupler for coupling an optical signal input to the first input port and the second input port and outputting the combined optical signal to the output port; An optical fiber Bragg grating for passing only a partial wavelength of the wavelength-division multiplexed optical signal output to the first output port of the first optical coupler to the first input port of the second optical coupler; A variable wavelength filter for separating and outputting some optical wavelengths among the wavelength division multiplexed optical signals output to the second output port of the first optical coupler; Control means for controlling the variable wavelength filter to adjust the separated optical wavelength; And a light source and an optical combiner to generate and combine optical channels to be newly combined, and then provide a second input port of the second optical coupler to the optical splitting multiplexing device in the wavelength division multiplex optical transmission system.

이하, 첨부된 도면을 참조하면서 본 발명의 한 실시예에 따른 ″파장분할다중 광통신시스템을 위한 광결합 분기 다중화기″를 보다 상세하게 설명하면 다음과 같다.Hereinafter, an optical coupling branch multiplexer for a wavelength division multiple optical communication system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 한 실시예에 따른 파장분할다중 광통신시스템을 위한 광결합 분기 다중화기를 도시한 구성도이다.2 is a block diagram illustrating an optically coupled branch multiplexer for a wavelength division multiplexing optical communication system according to an embodiment of the present invention.

광결합 분기 다중화기는, 제1광결합기(220)와, 제2광결합기(230), 제1광결합기와 제2광결합기(220, 230) 사이에 연결되는 광섬유 브래그 격자(241, 242) 등으로 이루어진다. 제1광결합기(220)는 입력포트(221)와, 제1출력포트(222), 제2출력포트(223) 및 제3출력포트(224)를 포함한다. 제1광결합기(220)에서 입력포트(221)로 입력되는 광신호는 제1출력포트(222) 및 제2출력포트(223)를 통해 출력된다. 제2광결합기(230)는 두 개의 입력포트들(231, 233)과 출력포트(232)를 포함한다.The optical coupling branch multiplexer includes a first optical coupler 220, a second optical coupler 230, optical fiber Bragg gratings 241 and 242 connected between the first optical coupler 220 and 230, and the like. Is done. The first optical coupler 220 includes an input port 221, a first output port 222, a second output port 223, and a third output port 224. An optical signal input from the first optical coupler 220 to the input port 221 is output through the first output port 222 and the second output port 223. The second optical coupler 230 includes two input ports 231 and 233 and an output port 232.

광결합 분기 다중화기와 광신호를 송수신하기 위해 광전송 선로(201)가 다중화기에 연결된다. 도 2에 도시된 바와 같이 광전송 경로(201)는 WDM 신호로부터 분기될 광파장 λ1, λ2, λ3, 및 λ4를 포함하는 파장분할다중된 광통신신호를 전달한다.An optical transmission line 201 is connected to the multiplexer for transmitting and receiving optical signals with the optically coupled branch multiplexer. As shown in FIG. 2, the optical transmission path 201 delivers a wavelength division multiplexed optical communication signal including optical wavelengths λ 1 , λ 2 , λ 3 , and λ 4 to be branched from the WDM signal.

결합될 광파장 λ1및 λ2를 차단하기 위해 광섬유 브래그 격자(241, 242)는 제1광결합기(220)와 제2광결합기(230) 사이의 광경로(250)에 놓여지는 바, 제1광결합기(220)의 제1출력포트(222)와 제2광결합기(230)의 제1입력포트(231)에 연결된다. 광섬유 브래그 격자들(241 및 242)은 광파장 λ1및 λ2를 반사함으로써 이 두 광파장이 제2광결합기(230)에 전달되지 못하도록 한다. 결국 입력되는 파장분할다중된 광신호 중 나머지 광파장이 광경로(250)에 의해 제2광결합기(230)의 제1입력포트(231)에 전달된다.The optical fiber Bragg gratings 241 and 242 are placed in the optical path 250 between the first optical coupler 220 and the second optical coupler 230 to block the optical wavelengths λ 1 and λ 2 to be coupled. The first output port 222 of the optical coupler 220 and the first input port 231 of the second optical coupler 230 are connected. The optical fiber Bragg gratings 241 and 242 reflect the optical wavelengths λ 1 and λ 2 to prevent these two wavelengths from being transmitted to the second optical coupler 230. Eventually, the remaining light wavelengths among the wavelength-multiplexed optical signals that are input are transmitted to the first input port 231 of the second optical coupler 230 by the optical path 250.

제1광결합기(220)의 입력포트(221)로 입력되는 파장분할다중된 광신호는 두 개의 출력포트(222 및 223)으로 나온다. 제2출력포트(223)는 광경로(260)에 연결되어 역다중화될 광파장이 선별된다. WDM 신호는 광분파기(261)로 전달되어 WDM 신호의 일부가 각각의 파장 선별기(262A 및 262B)로 출력된다. 파장 선별기(262A, 262B)는 파장분할다중된 광신호로부터 특정 파장 λ3및 λ4를 선별하여 도시되지 않은 수신기에 출력한다. WDM 광신호는 입력포트(263A, 263B)를 통해 선별기로 들어가며 광경로(264A, 264B)로 출력된다.The wavelength division multiplexed optical signal input to the input port 221 of the first optical coupler 220 is output to two output ports 222 and 223. The second output port 223 is connected to the optical path 260 to select the optical wavelength to be demultiplexed. The WDM signal is delivered to an optical splitter 261 where a portion of the WDM signal is output to the respective wavelength selectors 262A and 262B. The wavelength selectors 262A and 262B select specific wavelengths λ 3 and λ 4 from the wavelength division multiplexed optical signal and output them to a receiver (not shown). The WDM optical signal enters the selector through the input ports 263A and 263B and is output to the optical paths 264A and 264B.

광섬유 브래그 격자(241, 242)로부터 반사된 광파장 λ1및 λ2는 제1광결합기(220)의 제1출력포트(222)를 통해 입력되고 입력포트(221) 및 제3출력포트(224)로 출력된다. 이 중 제3출력포트(224)의 출력은 광경로(270)를 통해 광분파기(271)를 거쳐 파장 선별기(272A 및 272B)로 전달된다. 파장 선별기(272A, 272B)는 각각 광파장 λ1및 λ2를 선별하여 분기 신호를 출력 선로(274A 및 274B)로 내보낸다.The optical wavelengths λ 1 and λ 2 reflected from the optical fiber Bragg gratings 241 and 242 are input through the first output port 222 of the first optical coupler 220 and the input port 221 and the third output port 224. Is output. The output of the third output port 224 is transmitted to the wavelength selectors 272A and 272B through the optical splitter 271 through the optical path 270. The wavelength selectors 272A and 272B select light wavelengths λ 1 and λ 2 , respectively, and output branch signals to the output lines 274A and 274B.

통과 채널은 광섬유 브래그 격자(241, 242)를 지나 제2결합기(230)의 제1입력포트(231)로 들어가서 WDM 광통신 시스템에 결합될 광채널과 합해진다. 이를 위해 광채널 λ1및 λ2가 광원(281A 및 281B)에 의해 발생되어 광합파기(282)에서 합쳐진 후, 광경로(283)를 따라 제2광결합기(230)의 제2입력포트(233)에 전달된다. 광채널 λ1및 λ2는 광섬유 브래그 격자(241, 242)를 거친 WDM 광신호의 통과 채널에 결합된다. 결합된 신호는 출력포트(232)를 통해 제2광결합기(230)로부터 나와서 결국 광전송 경로(202)에 실린다.The pass channel passes through the optical fiber Bragg gratings 241 and 242 and enters the first input port 231 of the second combiner 230 and merges with the optical channel to be coupled to the WDM optical communication system. For this purpose, after the optical channels λ 1 and λ 2 are generated by the light sources 281A and 281B and merged in the optical combiner 282, the second input port 233 of the second optical coupler 230 along the optical path 283. Is passed on. The optical channels λ 1 and λ 2 are coupled to pass channels of the WDM optical signal via the optical fiber Bragg gratings 241, 242. The combined signal exits from the second optical coupler 230 through the output port 232 and is eventually loaded into the optical transmission path 202.

도 3은 본 발명의 다른 실시 예에 따른 광결합 분기 다중화기를 도시한 구성도이다. 이를 참조하면, 제1광결합기(320)와, 제2광결합기(330), 광섬유 브래그 격자(341, 342), 가변파장필터부(362), 가변파장필터부(362)를 전기적으로 제어하기 위한 제어수단(MC)(370), 광원(381A 및 381B), 광합파기(382) 등으로 구성된다. 이는 도 2에 도시된 실시예와 동일한 방법으로 동작한다.3 is a block diagram illustrating an optically coupled branch multiplexer according to another embodiment of the present invention. Referring to this, to electrically control the first optical coupler 320, the second optical coupler 330, the optical fiber Bragg gratings 341 and 342, the variable wavelength filter unit 362, and the variable wavelength filter unit 362. Control means (MC) 370, light sources 381A and 381B, light combiners 382, and the like. This works in the same way as the embodiment shown in FIG.

제1광결합기(320)는 하나의 입력포트(321)와, 제1출력포트(322), 및 제2출력포트(323)를 포함한다. 제2광결합기(330)는 제1입력포트(331)와, 제2입력포트(333), 및 출력포트(332)를 포함한다.The first optical coupler 320 includes one input port 321, a first output port 322, and a second output port 323. The second optical coupler 330 includes a first input port 331, a second input port 333, and an output port 332.

도 3의 광결합 분기 다중화기는 입력되는 파장분할다중된 광신호 중 임의의 파장을 가변적으로 선별하여 분기할 수 있는 점에서 도 2의 광결합 분기 다중화기와 다르다. 제1광결합기(320)의 입력포트(321)을 통해 들어오는 파장분할다중된 광신호 중 일부는 제2출력포트(323)로 출력되어, 광분파기(361)을 거쳐 가변파장필터(362A 및 362B)로 입력된다. 가변파장필터(362A 및 362B)는 제어수단(370)의 제어를 받아 입력되는 파장분할다중된 광신호로부터 선별된 파장채널 λi및 λj를 출력한다. 가변파장필터의 예로서, JDS FITEL로부터 상용화된 가변 패브리-페롯(Fabry-Perot) 에탈론 필터가 있다.The optical coupling branch multiplexer of FIG. 3 differs from the optical coupling branch multiplexer of FIG. 2 in that an arbitrary wavelength of an input wavelength division multiplexed optical signal can be variably selected and split. Some of the wavelength-division multiplexed optical signals that enter through the input port 321 of the first optical combiner 320 are output to the second output port 323, and then pass through the optical splitter 361 to the variable wavelength filters 362A and 362B. ) Is entered. The variable wavelength filters 362A and 362B output the wavelength channels λ i and λ j selected from the wavelength division multiplexed optical signals input under the control of the control means 370. An example of a variable wavelength filter is a variable Fabry-Perot etalon filter commercially available from JDS FITEL.

제1광결합기(320)의 제1출력포트(322)에서 나온 파장분할다중된 광신호 중 광섬유 브래그 격자(341, 342)를 거쳐 통과하는 광채널은 제2광결합기(330)의 제1입력포트(331)로 입력되어, 광원(381A 및 381B)과 광합파기(382)를 거쳐 제2입력포트(333)로부터 입력되는 광채널과 결합된다.Among the wavelength-division multiplexed optical signals from the first output port 322 of the first optical coupler 320, the optical channel passing through the optical fiber Bragg gratings 341 and 342 is the first input port of the second optical coupler 330. 331 is coupled to the optical channel input from the second input port 333 via the light sources 381A and 381B and the optical combiner 382.

위에서 제시한 실시예에 근거하여 이 발명을 설명하였지만, 이러한 실시예는 이 발명을 제한하려는 것이 아니라 예시하려는 것이다. 이 발명이 속하는 분야의 숙련자에게는 이 발명의 기술사상을 벗어남이 없이 위 실시예에 대한 다양한 변화나 변경 또는 조절이 가능함이 자명할 것이다. 그러므로, 이 발명의 보호범위는 첨부된 청구범위에 의해서만 한정될 것이며, 위와 같은 변화예나 변경예 또는 조절예를 모두 포함하는 것으로 해석되어야 할 것이다.While the invention has been described based on the embodiments presented above, these embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the invention. Therefore, the protection scope of the present invention will be limited only by the appended claims, and should be construed as including all such changes, modifications or adjustments.

이상과 같이 본 발명에 따르면, 광섬유 브래그 격자로부터 반사된 신호를 추가로 이용하여 분기 채널을 얻음으로써, 광결합 분기 다중화기에서 분기할 수 있는 채널의 수가 증가되므로 광분파기의 삽입 손실로 인한 분기 채널 수의 제한을 극복할 수 있는 효과가 있다. 또한, 분기 채널의 선별을 위해 가변파장필터를 사용함으로써 임의의 파장 채널을 가변적으로 분기할 수 있는 유연한 광결합 분기 다중화기를 구성할 수 있는 효과가 있다.As described above, according to the present invention, the branch channel is obtained by additionally using the signal reflected from the optical fiber Bragg grating, thereby increasing the number of channels that can branch in the optical coupling branch multiplexer. There is an effect to overcome the limitation of the number. In addition, by using the variable wavelength filter for the selection of the branch channel, there is an effect that can be configured a flexible optical coupling branch multiplexer that can variably branch any wavelength channel.

Claims (2)

파장분할다중된 광신호를 입력받아 제1출력포트 및 제2출력포트로 분할하여 출력하는 제1광결합기와;A first optical combiner for receiving a wavelength-divided multiplexed optical signal and dividing the optical signal into a first output port and a second output port; 상기 제1광결합기의 제1출력포트로 출력되는 파장분할다중된 광신호 중 일부파장을 반사하여 상기 제1광결합기의 제3출력포트로 출력하는 광섬유 브래그 격자;An optical fiber Bragg grating for reflecting a partial wavelength of the wavelength division multiplexed optical signal output to the first output port of the first optical coupler and outputting the wavelength to the third output port of the first optical coupler; 새로이 결합될 광채널들을 발생하여 결합하는 광원 및 광합파기;A light source and an optical combiner for generating and combining optical channels to be newly combined; 상기 광섬유 브래그 격자를 통과한 파장분할다중된 광신호와 상기 광합파기에서 결합된 광채널들을 결합하는 제2광결합기;A second optical coupler for coupling the wavelength-division multiplexed optical signal passing through the optical fiber Bragg grating and the optical channels coupled in the optical combiner; 상기 제1광결합기의 제2출력포트로 출력되는 파장분할다중된 광신호 중 일부 파장을 선별하여 출력하는 광분파기 및 파장 선별기; 및An optical splitter and a wavelength selector for selecting and outputting some wavelengths among the wavelength-division multiplexed optical signals output to the second output port of the first optical coupler; And 상기 제1광결합기의 제3출력포트로 출력되는 파장분할다중된 광신호 중 일부 파장을 선별하여 출력하는 광분파기 및 파장 선별기를 포함한 것을 특징으로 하는 파장분할다중 광전송시스템에서 광결합 분기 다중 장치.The optical splitting multiplexing device of claim 1, further comprising an optical splitter and a wavelength selector for selecting and outputting a portion of wavelength-multiplexed optical signals output to the third output port of the first optical combiner. 파장분할다중된 광신호를 입력받아 제1출력포트 및 제2출력포트로 분할하여 출력하는 제1광결합기와;A first optical combiner for receiving a wavelength-divided multiplexed optical signal and dividing the optical signal into a first output port and a second output port; 제1입력포트 및 제2입력포트로 입력되는 광신호를 결합하여 출력포트로 출력하는 제2광결합기;A second optical coupler for coupling an optical signal input to the first input port and the second input port and outputting the combined optical signal to the output port; 상기 제1광결합기의 제1출력포트로 출력되는 파장분할다중된 광신호 중 일부 파장만을 상기 제2광결합기의 제1입력포트로 통과시키는 광섬유 브래그 격자;An optical fiber Bragg grating for passing only a partial wavelength of the wavelength-division multiplexed optical signal output to the first output port of the first optical coupler to the first input port of the second optical coupler; 상기 제1광결합기의 제2출력포트로 출력되는 파장분할다중된 광신호 중 일부 광파장을 분리하여 출력하는 광분파기 및 가변파장필터;An optical splitter and a variable wavelength filter for separating and outputting some optical wavelengths among the wavelength division multiplexed optical signals output to the second output port of the first optical coupler; 상기 분리되는 광파장을 조절하기 위하여 상기 가변파장필터를 제어하는 제어수단; 및Control means for controlling the variable wavelength filter to adjust the separated optical wavelength; And 새로이 결합될 광채널들을 발생하여 결합한 후 상기 제2광결합기의 제2입력포트로 제공하는 광원 및 광합파기를 포함한 것을 특징으로 하는 파장분할다중 광전송시스템에서 광결합 분기 다중 장치.And a light source and an optical combiner for generating and combining new optical channels to be coupled and then providing the second input port of the second optical coupler.
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KR100207602B1 (en) * 1996-12-06 1999-07-15 윤종용 Optical filter for preventing loss of optical power and optical demultiplexer using same
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KR100377199B1 (en) * 2000-10-27 2003-03-26 주식회사 케이티 The Apparatus for Widely Tunable Optical Add-Drop Filtering
KR20020080267A (en) * 2001-04-11 2002-10-23 엔이씨 미야기, 리미티드. Oadm system and method for computing wavelength number therein

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