JP4376647B2

JP4376647B2 - Wavelength router and optical wavelength division multiplexing transmission system

Info

Publication number: JP4376647B2
Application number: JP2004026817A
Authority: JP
Inventors: 一人野口; 扇太鈴木; 茂登松岡; 摂森脇
Original assignee: Nippon Telegraph and Telephone Corp
Current assignee: Nippon Telegraph and Telephone Corp
Priority date: 2004-02-03
Filing date: 2004-02-03
Publication date: 2009-12-02
Anticipated expiration: 2024-02-03
Also published as: JP2005223418A

Description

本発明は、光波長多重された複数の光信号を波長によって経路振り分けを行う波長ルータと、この波長ルータを用いて複数の送受信装置間において伝送する光波長多重伝送通信システムに関する。 The present invention relates to a wavelength router that distributes a plurality of optical signals that have been subjected to optical wavelength division multiplexing according to the wavelength, and an optical wavelength division multiplexing communication system that uses the wavelength router to transmit between a plurality of transmission / reception apparatuses.

光波長多重（ＷＤＭ）伝送システムは、複数の光信号を異なる光周波数に割り当てることで、１本の光ファイバにより伝送できる伝送容量を大幅に増大させるだけでなく、波長に対して、信号の行き先情報を割り当てる波長アドレッシングが可能である。
さらに、スター型光波長分割多重ネットワークシステムは、周期的な入出力関係の分波特性を有する波長ルータを中心に、Ｎ個の送受信装置間が接続されるように配置されており、Ｎ波長の光信号を用いるだけで装置間を相互接続するＮ×Ｎの信号路を独立にフルメッシュ接続することが可能な光波長多重通信システムを実現できる（特許文献１参照）。 An optical wavelength division multiplexing (WDM) transmission system not only greatly increases the transmission capacity that can be transmitted by one optical fiber by assigning a plurality of optical signals to different optical frequencies, but also the destination of the signal with respect to the wavelength. Wavelength addressing for assigning information is possible.
Further, the star-type optical wavelength division multiplexing network system is arranged so that N transmission / reception devices are connected around a wavelength router having a demultiplexing characteristic of a periodic input / output relationship. It is possible to realize an optical wavelength division multiplexing communication system capable of independently connecting full-mesh N × N signal paths interconnecting devices only by using the above optical signal (see Patent Document 1).

図５は、上述した従来の波長ルータを用いて構成した、光波長多重通信システムを示す概略図である。
この図５において、符号５０１〜５０７はＷＤＭ信号(波長λ1〜λnの光信号を合波した信号)を送受信する送受信装置であり、符号５０８はＮポートの入出力を持つ周期的な入出力関係の分波特性を有する波長ルータである。
図５の例においては、波長ルータ５０８としてアレイ導波路回折格子型合分波回路（ＡＷＧ）を用いており、波長ルータ５０８と各送受信装置５０１〜５０７とはそれぞれ上りと下りの２本の光ファイバで接続されている。 FIG. 5 is a schematic diagram showing an optical wavelength division multiplexing communication system configured using the conventional wavelength router described above.
In FIG. 5, reference numerals 501 to 507 denote transmission / reception apparatuses that transmit and receive WDM signals (signals obtained by combining optical signals of wavelengths λ1 to λn), and reference numeral 508 denotes a periodic input / output relationship having N port inputs and outputs. This is a wavelength router having the following demultiplexing characteristics.
In the example of FIG. 5, an arrayed waveguide grating type multiplexer / demultiplexer (AWG) is used as the wavelength router 508, and the wavelength router 508 and each of the transmission / reception devices 501 to 507 each have two light beams, upstream and downstream. Connected with fiber.

次に、図６は図５に示す光波長多重通信システムの概略構成を説明する概念図である。図６における符号６０１〜６０４は送受信装置であり、符号６０５はＷＤＭ信号(波長λ1〜λnの光信号を合波した信号)を受信する受信装置であり、符号６０６はＷＤＭ信号(波長λ1〜λnの光信号を合波した信号)を送信する送信装置であり、符号６０７は１本の光ファイバに波長多重されたＷＤＭ信号を分波するための分波器であり、符号６０８は送信装置６０６からの波長の異なる複数の光信号を１本の光ファイバに合波するための合波器であり、符号６０９は波長ルータ（ＡＷＧ）であり、符号６１０〜６１３は送受信装置６０１〜６０４と波長ルータ６０９との入出力ポートを光学的に接続する光ファイバである。
なお，送受信装置６０２〜６０４の構成は、送受信装置６０１と同様である。１台の送受信装置と波長ルータ６０９とは、上り及び下りあわせて２本の光ファイバで接続されている。 Next, FIG. 6 is a conceptual diagram illustrating a schematic configuration of the optical wavelength multiplexing communication system shown in FIG. 6, reference numerals 601 to 604 denote transmission / reception apparatuses, reference numeral 605 denotes a reception apparatus that receives a WDM signal (a signal obtained by combining optical signals having wavelengths λ1 to λn), and reference numeral 606 denotes a WDM signal (wavelengths λ1 to λn). 607 is a demultiplexer for demultiplexing a WDM signal wavelength-multiplexed on one optical fiber, and 608 is a transmitter 606. Is a multiplexer for multiplexing a plurality of optical signals having different wavelengths to one optical fiber, reference numeral 609 is a wavelength router (AWG), reference numerals 610 to 613 are the wavelengths of transmission / reception devices 601 to 604 This is an optical fiber that optically connects an input / output port with the router 609.
Note that the configuration of the transmission / reception devices 602 to 604 is the same as that of the transmission / reception device 601. One transmission / reception apparatus and the wavelength router 609 are connected by two optical fibers, both upstream and downstream.

上述した従来の波長ルータを用いて構成した光波長多重通信システムにおいては、この波長ルータにおいて、隣接する送受信装置のポートからのクロストークによる信号劣化を防ぐ必要がある。
また、通信システムにおける波長ルータは、透過帯域の中心波長において、透過損失が最小となり、かつクロストークも最小となるように設計されている。
ここで，信号波長が透過帯域の中心波長からずれると損失が増大すると同時に，隣接チャネルへのクロストークが増大する。 In the optical wavelength division multiplexing communication system configured using the conventional wavelength router described above, it is necessary to prevent signal degradation due to crosstalk from the ports of adjacent transmitting / receiving devices in this wavelength router.
Further, the wavelength router in the communication system is designed so that the transmission loss is minimized and the crosstalk is minimized at the center wavelength of the transmission band.
Here, when the signal wavelength deviates from the center wavelength of the transmission band, the loss increases, and at the same time, the crosstalk to the adjacent channel increases.

特に、レーザの温度制御をしないＣＷＤＭ（CoarseＷＤＭ）システムにおいては、図７に示すように、環境温度の変化によって、送信機におけるレーザの発光波長がシフトして、波長ルータの隣接するポートへの光信号にクロストークが生じる。
これを避けるため、上記波長ルータにおけるクロストークを低減しようとすると、波長ルータの透過帯域を狭める必要がある。
しかしながら、透過帯域を狭めると、そのため光信号の透過損失が増大し、ＣＷＤＭシステムにおいては、使用する周囲の環境温度を制限するなどの対策が必要となる。 In particular, in a CWDM (Coarse WDM) system that does not control the temperature of the laser, as shown in FIG. 7, the light emission wavelength of the laser in the transmitter shifts due to a change in the environmental temperature, and the light to the adjacent port of the wavelength router Crosstalk occurs in the signal.
In order to avoid this, in order to reduce the crosstalk in the wavelength router, it is necessary to narrow the transmission band of the wavelength router.
However, when the transmission band is narrowed, the transmission loss of the optical signal increases, and in the CWDM system, measures such as limiting the ambient environmental temperature to be used are required.

また、文献（２００２年電子情報通信学通信ソサイエティ大会Ｂ−１２−２）に示されているような波長ルータの透過帯域の中に、複数の波長の信号群(波長群)を割り当て、同時にルーティングする波長群ルーティングがある。
この波長群ルーティングにおいては、波長ルータの透過帯域の中央から外れた波長の光信号を用いるため、隣接チャネルへのクロストーク成分が大きくなる。
この場合，所望のクロストーク特性を得ようとして、波長ルータの透過帯域を狭くすると、使用できる波長数を減らす必要があり、伝送効率を低下させることになる。
さらに、伝送速度４０Ｇbit/sなどの高遮光伝送システムにおいては、透過帯域の狭い波長ルータを用いると、変調側波帯が歪むことにより、光信号の伝送エラーが生じるという問題がある。 In addition, a signal group (wavelength group) of a plurality of wavelengths is assigned to the transmission band of the wavelength router as shown in the literature (2002 Electronic Information Communication Society Society B-12-2), and routing is performed simultaneously. There is a wavelength group routing.
In this wavelength group routing, since an optical signal having a wavelength deviating from the center of the transmission band of the wavelength router is used, a crosstalk component to an adjacent channel increases.
In this case, if the transmission band of the wavelength router is narrowed in order to obtain a desired crosstalk characteristic, it is necessary to reduce the number of wavelengths that can be used, thereby reducing the transmission efficiency.
Further, in a high light-shielding transmission system such as a transmission speed of 40 Gbit / s, there is a problem that when a wavelength router with a narrow transmission band is used, a modulation sideband is distorted, thereby causing an optical signal transmission error.

本発明はこのような事情に鑑みてなされたものであり、波長ルーティング回路に要求されるクロストーク特性を緩和し、ＣＷＤＭシステムや波長群ルーティングシステム、あるいは高速伝送システムにおいて、低損失かつ透過帯域の広い波長ルータを提供するとともに、高性能な光波長多重通信システムを安価に提供することを目的とする。 The present invention has been made in view of such circumstances, and relaxes the crosstalk characteristics required for wavelength routing circuits. In a CWDM system, a wavelength group routing system, or a high-speed transmission system, the present invention has a low loss and a low transmission band. An object of the present invention is to provide a wide wavelength router and to provide a high-performance optical wavelength division multiplexing communication system at a low cost.

本発明の波長ルータは、４本の入力ポートと４本の出力ポートを備え、波長周回性を有する第一の光合分波回路と第二の光合分波回路と、インターリーバから構成される４個の光合波回路を具備する波長ルータであって、前記第一の光合分波回路および第二の光合分波回路は、４本の入力ポートと４本の出力ポートとを各々備え、入力された波長多重光信号を波長により所定の出力ポートに出力する機能を有し、前記光合波回路の各々が２本の入力ポートと１本の出力ポートとを備え、前記波長ルータのＭ番目（Ｍは１≦Ｍ≦４の範囲の整数）の入力ポートが、Ｍが奇数の場合は前記第一の光合分波回路のＭ番目の入力ポートに、接続され、Ｍが偶数の場合は前記第二の光合分波回路のＭ番目の入力ポートに接続され、前記２つの光合分波回路のＭ番目の出力ポートが、Ｍ番目の前記光合波回路の入力ポートにそれぞれ接続されており、Ｍ番目の前記光合波回路の出力ポートが前記波長ルータのＭ番目の出力ポートに接続されていること特徴とする。 Wavelength router of the present invention is provided with four input ports and four output ports, and a second optical multiplexing and demultiplexing circuit first optical demultiplexing circuit having a wavelength cyclic frequency, and a y Ntariba 4 A wavelength router having a plurality of optical multiplexing / demultiplexing circuits, wherein the first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit each include four input ports and four output ports and are input Each of the optical multiplexing circuits has two input ports and one output port, and each of the optical routers has an M-th (M Is an integer in the range of 1 ≦ M ≦ 4, when M is an odd number, it is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit, and when M is an even number, the second port Connected to the Mth input port of the optical multiplexing / demultiplexing circuit of M-th output port is connected to an input port of the M-th optical multiplexing circuit, and an output port of the M-th optical multiplexing circuit is connected to the M-th output port of the wavelength router. It is a feature.

本発明の波長ルータは、４本の入力ポートと８本の出力ポートを備えた第一の光合分波回路と第二の光合分波回路と、２本の入力ポートと１本の出力ポートを備えた第一、第二、第三、第四、第五、第六、第七及び第八の光合流回路と、インターリーバから構成される第一、第二、第三及び第四の光合波回路を具備する波長ルータであって、前記第一の光合分波回路および第二の光合分波回路は、４本の入力ポートと８本の出力ポートとを各々備え、入力された波長多重光信号を波長により所定の出力ポートに出力する機能を有し、前記第一、第二、第三及び第四の光合波回路の各々が２本の入力ポートと１本の出力ポートとを備え、前記波長ルータのＭ番目（Ｍは１≦Ｍ≦４の範囲の整数）の入力ポートが、Ｍが奇数の場合は前記第一の光合分波回路のＭ番目の入力ポートに、接続され、Ｍが偶数の場合は前記第二の光合分波回路のＭ番目の入力ポートに接続され、前記第一の光合分波回路の１番目、５番目の出力ポートがそれぞれ前記第一の光合流回路の１番目、２番目の入力ポートに接続され、前記第一の光合分波回路の２番目、６番目の出力ポートがそれぞれ前記第二の光合流回路の１番目、２番目の入力ポートに接続され、前記第一の光合分波回路の３番目、７番目の出力ポートがそれぞれ前記第三の光合流回路の１番目、２番目の入力ポートに接続され、前記第一の光合分波回路の４番目、８番目の出力ポートがそれぞれ前記第四の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の１番目、５番目の出力ポートがそれぞれ前記第五の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の２番目、６番目の出力ポートがそれぞれ前記第六の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の３番目、７番目の出力ポートがそれぞれ前記第七の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の４番目、８番目の出力ポートがそれぞれ前記第八の光合流回路の１番目、２番目の入力ポートに接続され、前記第一及び第五の光合流回路各々の出力ポートが、前記第一の光合波回路の入力ポートにそれぞれ接続され、前記第二及び第六の光合流回路各々の出力ポートが、前記第二の光合波回路の入力ポートにそれぞれ接続され、前記第三及び第七の光合流回路各々の出力ポートが、前記第三の光合波回路の入力ポートにそれぞれ接続され、前記第四及び第八の光合流回路各々の出力ポートが、前記第四の光合波回路の入力ポートにそれぞれ接続され、Ｍ番目の前記第Ｍの光合波回路の出力ポートが前記波長ルータのＭ番目の出力ポートに接続されていること特徴とする。
本発明の波長ルータは、前記第一及び第二の光合分波回路が、アレイ導波路回折格子であることを特徴とする。 The wavelength router according to the present invention includes a first optical multiplexing / demultiplexing circuit having four input ports and eight output ports, a second optical multiplexing / demultiplexing circuit, two input ports, and one output port. The first, second, third, fourth, fifth, sixth, seventh and eighth optical merging circuits and the first, second, third and fourth optical merging circuits comprising an interleaver. A wavelength router having a wave circuit, wherein the first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit each include four input ports and eight output ports, and the wavelength division multiplexing that is input It has a function of outputting an optical signal to a predetermined output port according to wavelength, and each of the first, second, third and fourth optical multiplexing circuits has two input ports and one output port. When the Mth input port of the wavelength router (M is an integer in the range of 1 ≦ M ≦ 4) is M, the first light Connected to the Mth input port of the multiplexing / demultiplexing circuit. When M is an even number, the Mth input port is connected to the Mth input port of the second optical multiplexing / demultiplexing circuit. The fifth output port is connected to the first and second input ports of the first optical combining circuit, respectively, and the second and sixth output ports of the first optical combining and dividing circuit are respectively connected to the second optical port. Are connected to the first and second input ports of the first optical combining circuit, and the third and seventh output ports of the first optical combining / demultiplexing circuit are respectively the first and second input ports of the third optical combining circuit. Connected to the input port, and the fourth and eighth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the fourth optical multiplexing circuit, respectively. The first and fifth output ports of the branching circuit are the fifth light, respectively. Connected to the first and second input ports of the flow circuit, and the second and sixth output ports of the second optical multiplexing / demultiplexing circuit are the first and second input ports of the sixth optical coupling circuit, respectively. And the third and seventh output ports of the second optical multiplexing / demultiplexing circuit are respectively connected to the first and second input ports of the seventh optical multiplexing / demultiplexing circuit, and the second optical multiplexing / demultiplexing circuit The fourth and eighth output ports of the circuit are connected to the first and second input ports of the eighth optical merging circuit, respectively, and the output ports of the first and fifth optical merging circuits are respectively connected to the first and fifth optical merging circuits. Each of the second and sixth optical combining circuits is connected to an input port of the second optical combining circuit, and each of the third and seventh optical combining circuits is connected to an input port of the second optical combining circuit. The output port of each of the optical merging circuits of the third Respectively connected to the input port of the multiplexing circuit, and the output ports of the fourth and eighth optical combining circuits are respectively connected to the input ports of the fourth optical combining circuit, and the Mth optical combining circuit of the Mth. The output port of the wave circuit is connected to the Mth output port of the wavelength router .
The wavelength router of the present invention is characterized in that the first and second optical multiplexing / demultiplexing circuits are arrayed waveguide diffraction gratings.

本発明の光波長多重伝送システムは、互いに波長の異なる光信号を発生する複数の光送信器、及びこの複数の光送信器の出力光信号を多重化する合波器を含む光送信手段と、１本の光ファイバからなり、前記光送信手段の出力光信号が入力される第１の光ファイバ伝送路と、複数の前記第１の光ファイバ伝送路の各々がそれぞれ異なった入力ポートに接続され、前記入力ポートから入力される前記出力光信号の波長によって経路振り分けを行い、振り分けた前記出力光信号を対応した波長の出力ポートから出力する波長ルータと、前記波長ルータの前記出力ポートそれぞれに接続され、１本の光ファイバからなる第２の光ファイバ伝送路と、前記第２の光ファイバ伝送路が伝送した光信号を波長毎に分波する分波器と、この分波器により分波された波長毎に光信号を受信する複数の光受信器とを含む光受信手段とを備えた光波長多重伝送システムにおいて、
前記波長ルータが、４本の入力ポートと４本の出力ポートを備え、波長周回性を有する第一の光合分波回路と第二の光合分波回路と、インターリーバから構成される４個の光合波回路を具備する波長ルータであり、前記第一の光合分波回路および第二の光合分波回路は、４本の入力ポートと４本の出力ポートとを各々備え、入力された波長多重光信号を波長により所定の出力ポートに出力する機能を有しており、前記光合波回路の各々が２本の入力ポートと１本の出力ポートとを備え、前記波長ルータのＭ番目（Ｍは１≦Ｍ≦４の範囲の整数）の入力ポートが、Ｍが奇数の場合は前記第一の光合分波回路のＭ番目の入力ポートに、接続され、Ｍが偶数の場合は前記第二の光合分波回路のＭ番目の入力ポートに接続され、前記２つの光合分波回路のＭ番目の出力ポートが、Ｍ番目の前記光合波回路の入力ポートにそれぞれ接続されており、Ｍ番目の前記光合波回路の出力ポートが前記波長ルータのＭ番目の出力ポートに接続されていること特徴とする。
本発明の光波長多重伝送システムは、互いに波長の異なる光信号を発生する複数の光送信器、及びこの複数の光送信器の出力光信号を多重化する合波器を含む光送信手段と、１本の光ファイバからなり、前記光送信手段の出力光信号が入力される第１の光ファイバ伝送路と、複数の前記第１の光ファイバ伝送路の各々がそれぞれ異なった入力ポートに接続され、前記入力ポートから入力される前記出力光信号の波長によって経路振り分けを行い、振り分けた前記出力光信号を対応した波長の出力ポートから出力する波長ルータと、前記波長ルータの前記出力ポートそれぞれに接続され、１本の光ファイバからなる第２の光ファイバ伝送路と、前記第２の光ファイバ伝送路が伝送した光信号を波長毎に分波する分波器と、この分波器により分波された波長毎に光信号を受信する複数の光受信器とを含む光受信手段とを備えた光波長多重伝送システムにおいて、前記波長ルータが、４本の入力ポートと８本の出力ポートを備えた第一の光合分波回路と第二の光合分波回路と、２本の入力ポートと１本の出力ポートを備えた第一、第二、第三、第四、第五、第六、第七及び第八の光合流回路と、インターリーバから構成される第一、第二、第三及び第四の光合波回路を具備する波長ルータであって、前記第一の光合分波回路および第二の光合分波回路は、４本の入力ポートと８本の出力ポートとを各々備え、入力された波長多重光信号を波長により所定の出力ポートに出力する機能を有し、前記第一、第二、第三及び第四の光合波回路の各々が２本の入力ポートと１本の出力ポートとを備え、前記波長ルータのＭ番目（Ｍは１≦Ｍ≦４の範囲の整数）の入力ポートが、Ｍが奇数の場合は前記第一の光合分波回路のＭ番目の入力ポートに、接続され、Ｍが偶数の場合は前記第二の光合分波回路のＭ番目の入力ポートに接続され、前記第一の光合分波回路の１番目、５番目の出力ポートがそれぞれ前記第一の光合流回路の１番目、２番目の入力ポートに接続され、前記第一の光合分波回路の２番目、６番目の出力ポートがそれぞれ前記第二の光合流回路の１番目、２番目の入力ポートに接続され、前記第一の光合分波回路の３番目、７番目の出力ポートがそれぞれ前記第三の光合流回路の１番目、２番目の入力ポートに接続され、前記第一の光合分波回路の４番目、８番目の出力ポートがそれぞれ前記第四の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の１番目、５番目の出力ポートがそれぞれ前記第五の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の２番目、６番目の出力ポートがそれぞれ前記第六の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の３番目、７番目の出力ポートがそれぞれ前記第七の光合流回路の１番目、２番目の入力ポートに接続され、前記第二の光合分波回路の４番目、８番目の出力ポートがそれぞれ前記第八の光合流回路の１番目、２番目の入力ポートに接続され、前記第一及び第五の光合流回路各々の出力ポートが、前記第一の光合波回路の入力ポートにそれぞれ接続され、前記第二及び第六の光合流回路各々の出力ポートが、前記第二の光合波回路の入力ポートにそれぞれ接続され、前記第三及び第七の光合流回路各々の出力ポートが、前記第三の光合波回路の入力ポートにそれぞれ接続され、前記第四及び第八の光合流回路各々の出力ポートが、前記第四の光合波回路の入力ポートにそれぞれ接続され、Ｍ番目の前記第Ｍの光合波回路の出力ポートが前記波長ルータのＭ番目の出力ポートに接続されていること特徴とする。 An optical wavelength division multiplexing transmission system of the present invention includes a plurality of optical transmitters that generate optical signals having different wavelengths, and an optical transmission unit that includes a multiplexer that multiplexes output optical signals of the plurality of optical transmitters, Each of the first optical fiber transmission line and the plurality of first optical fiber transmission lines each made of a single optical fiber to which the output optical signal of the optical transmission means is input is connected to a different input port. The path is assigned according to the wavelength of the output optical signal input from the input port, and the distributed output optical signal is output from the output port of the corresponding wavelength, and connected to each of the output ports of the wavelength router. are, one and the second optical fiber transmission line consisting of optical fiber, and a duplexer said second optical fiber transmission line is demultiplexed for each wavelength of optical signal transmission, demultiplexed by the demultiplexer In the optical wavelength multiplexing transmission system and an optical receiving means comprising a a plurality of optical receivers for receiving the optical signal for each wavelength,
The wavelength router includes four input ports and four output ports, and includes four first and second optical multiplexing / demultiplexing circuits each having wavelength reciprocity and an interleaver. 2. A wavelength router having an optical multiplexing circuit, wherein the first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit each include four input ports and four output ports, and input wavelength multiplexing A function of outputting an optical signal to a predetermined output port according to a wavelength, and each of the optical multiplexing circuits includes two input ports and one output port; An input port in the range of 1 ≦ M ≦ 4) is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit when M is odd, and the second port when M is even Connected to the Mth input port of the optical multiplexing / demultiplexing circuit, the two optical multiplexing / demultiplexing circuits M-th output port is connected to an input port of the M-th optical multiplexing circuit, and an output port of the M-th optical multiplexing circuit is connected to the M-th output port of the wavelength router. It is a feature.
An optical wavelength division multiplexing transmission system of the present invention includes a plurality of optical transmitters that generate optical signals having different wavelengths, and an optical transmission unit that includes a multiplexer that multiplexes output optical signals of the plurality of optical transmitters, Each of the first optical fiber transmission line and the plurality of first optical fiber transmission lines each made of a single optical fiber to which the output optical signal of the optical transmission means is input is connected to a different input port. The path is assigned according to the wavelength of the output optical signal input from the input port, and the distributed output optical signal is output from the output port of the corresponding wavelength, and connected to each of the output ports of the wavelength router. are, one and the second optical fiber transmission line consisting of optical fiber, and a duplexer said second optical fiber transmission line is demultiplexed for each wavelength of optical signal transmission, demultiplexed by the demultiplexer In an optical wavelength division multiplexing transmission system including an optical receiving unit including a plurality of optical receivers that receive optical signals for each wavelength, the wavelength router includes four input ports and eight output ports. The first, second, third, fourth, fifth, sixth, first optical multiplexing / demultiplexing circuit, second optical multiplexing / demultiplexing circuit, two input ports and one output port, A wavelength router comprising seventh and eighth optical combining circuits, and first, second, third and fourth optical combining circuits composed of an interleaver, wherein the first optical combining / demultiplexing circuit and The second optical multiplexing / demultiplexing circuit includes four input ports and eight output ports, respectively, and has a function of outputting the input wavelength-multiplexed optical signal to a predetermined output port according to the wavelength. Each of the second, third, and fourth optical multiplexing circuits has two input ports and one output port. , The Mth input port of the wavelength router (M is an integer in the range of 1 ≦ M ≦ 4) is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit when M is an odd number, When M is an even number, it is connected to the Mth input port of the second optical multiplexing / demultiplexing circuit, and the first and fifth output ports of the first optical multiplexing / demultiplexing circuit are respectively connected to the first optical multiplexing / demultiplexing circuit. Are connected to the first and second input ports, and the second and sixth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the second optical multiplexing circuit, respectively. The third and seventh output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the third optical multiplexing / demultiplexing circuit, respectively, The fourth and eighth output ports are the first and second of the fourth optical converging circuit, respectively. The first and fifth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the fifth optical multiplexing circuit, respectively. The second and sixth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the sixth optical multiplexing / demultiplexing circuit, respectively, and the third and seventh of the second optical multiplexing / demultiplexing circuit are connected. Are connected to the first and second input ports of the seventh optical combining circuit, and the fourth and eighth output ports of the second optical combining and dividing circuit are respectively connected to the eighth optical combining circuit. Connected to the first and second input ports of the circuit, and the output ports of each of the first and fifth optical combining circuits are connected to the input ports of the first optical combining circuit, respectively, and The output port of each of the six optical confluence circuits is connected to the second light Connected to the input port of the optical circuit, and the output ports of the third and seventh optical combining circuits are connected to the input ports of the third optical combining circuit, respectively, and the fourth and eighth optical combining circuits are connected. The output port of each circuit is connected to the input port of the fourth optical multiplexing circuit, and the output port of the Mth optical multiplexing circuit is connected to the Mth output port of the wavelength router. It is a feature.

以上説明したように、本発明の波長ルータによれば、波長ルーティング回路に要求されるクロストーク特性を緩和し、ＣＷＤＭシステムや波長群ルーティングシステムにおいて、低損失な波長ルータを提供し、かつ高性能な光波長多重通信システムを安価に提供することが可能となる。 As described above, according to the wavelength router of the present invention, the crosstalk characteristic required for the wavelength routing circuit is alleviated, a low-loss wavelength router is provided in a CWDM system and a wavelength group routing system, and a high performance It becomes possible to provide an inexpensive optical wavelength division multiplexing communication system at a low cost.

本発明の波長ルータは、Ｎ本（Ｎは１以上の整数）の入力ポートとＮ本の出力ポートを備えており、第一の光合分波回路と第二の光合分波回路との２つの光合分波回路と、Ｎ個の光合波回路を具備している。
そして、上記第一の光合分波回路および第二の光合分波回路は、各々Ｎ本の入力ポートとＮ本の出力ポートとを有しており、入力された波長多重光信号を波長により所定の出力ポートに出力する機能を備えている。
また、上記光合波回路各々は２本の入力ポートと１本の出力ポートとを備えており、上記波長ルータのＭ番目（Ｍは１≦Ｍ≦Ｎの範囲の整数）の入力ポートが、Ｍが奇数の場合に、上記第一の光合分波回路のＭ番目の入力ポートに接続され、Ｍが偶数の場合に、上記第二の光合分波回路のＭ番目の入力ポートに接続され、これら２つの光合分波回路のＭ番目の出力ポートが、Ｍ番目の光合波回路の入力ポートにそれぞれ接続されており、Ｍ番目の光合波回路の出力ポートが波長ルータのＭ番目の出力ポートに接続されている。 The wavelength router of the present invention includes N (N is an integer equal to or greater than 1) input ports and N output ports, and includes two first optical multiplexing / demultiplexing circuits and two optical multiplexing / demultiplexing circuits. An optical multiplexing / demultiplexing circuit and N optical multiplexing circuits are provided.
The first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit each have N input ports and N output ports, and input wavelength-multiplexed optical signals are predetermined according to the wavelength. It has a function to output to the output port.
Each of the optical multiplexing circuits includes two input ports and one output port, and the Mth input port (M is an integer in the range of 1 ≦ M ≦ N) of the wavelength router is M Is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit, and when M is an even number, it is connected to the Mth input port of the second optical multiplexing / demultiplexing circuit. The Mth output port of the two optical multiplexing / demultiplexing circuits is connected to the input port of the Mth optical multiplexing circuit, and the output port of the Mth optical multiplexing circuit is connected to the Mth output port of the wavelength router. Has been.

そして、本発明のルータは、例えば、図６に示すような、互いに波長の異なる光信号を発生して、少なくとも一部の伝送速度が異なる複数の光送信装置（６０６）と、この複数の光送信器の出力光信号を多重化する合波器（６０８）と、多重化した光信号を増幅する増幅手段とを含む光送信器（図示せず）と、この光送信手段の出力光信号が入力される光ファイバ伝送路（光ファイバ６１０〜６１３）と、この光ファイバ伝送路における光信号を波長によって経路振り分けを行う波長ルータ（本発明の波長ルータを使用）と、この光ファイバ伝送路が伝送した光信号を波長毎に分波する分波器（６０７）と、この分波器により分波された波長毎に光信号を受信する複数の光受信装置（６０５）とを備えた光波長多重伝送システムの波長ルータとして用いられる。 Then, the router of the present invention generates optical signals having different wavelengths from each other as shown in FIG. 6, for example, and a plurality of optical transmission devices (606) having different transmission speeds and the plurality of optical signals. An optical transmitter (not shown) including a multiplexer (608) that multiplexes the output optical signal of the transmitter, and an amplification means that amplifies the multiplexed optical signal, and an output optical signal of the optical transmission means An input optical fiber transmission line (optical fibers 610 to 613), a wavelength router (using the wavelength router of the present invention) that distributes the optical signal in the optical fiber transmission line according to the wavelength, and the optical fiber transmission line An optical wavelength provided with a demultiplexer (607) for demultiplexing the transmitted optical signal for each wavelength and a plurality of optical receiving devices (605) for receiving the optical signal for each wavelength demultiplexed by the demultiplexer. Wavelength router for multiplex transmission system Used in.

＜第１の実施形態＞
以下、本発明の第１の実施形態による波長ルータを図面を参照して説明する。図１は第１の実施形態の波長ルータを用いた光波長多重通信システムの構成例を示すブロック図である。
この図において、符号１０１〜１０４はＷＤＭ信号(波長λ1〜λ4の光信号を合波した信号)を送信する送信装置であり、符号１０５〜１０８はＷＤＭ信号(波長λ1〜λ4の光信号を合波した信号)を受信する受信装置である。
そして、符号１２３は、４ポートの入出力、すなわち、入力ポートＩＩ１〜ＩＩ４，出力ポートＯＯ１〜ＯＯ４を有し、周期的な入出力関係の分波特性を有する４×４波長ルータである。
符号１０９〜１１６は、送受信装置１０１〜１０８と波長ルータ１２３とを接続する光ファイバである。
なお、送受信装置１０１〜１０８の構成は、図６に示した従来例の送受信装置６０１〜６０４と同様である。 <First Embodiment>
A wavelength router according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of an optical wavelength division multiplexing communication system using the wavelength router according to the first embodiment.
In this figure, reference numerals 101 to 104 denote transmitting apparatuses that transmit WDM signals (signals obtained by combining optical signals of wavelengths λ1 to λ4), and reference numerals 105 to 108 denote WDM signals (optical signals of wavelengths λ1 to λ4). It is a receiving device that receives a wave signal).
Reference numeral 123 denotes a 4 × 4 wavelength router having four ports of input / output, that is, input ports II1 to II4 and output ports OO1 to OO4, and having periodic input / output demultiplexing characteristics .
Reference numerals 109 to 116 denote optical fibers that connect the transmission / reception apparatuses 101 to 108 and the wavelength router 123.
The configurations of the transmission / reception devices 101 to 108 are the same as those of the conventional transmission / reception devices 601 to 604 shown in FIG.

ここで、本実施形態の波長ルータ１２３は、図６に示した従来例と異なる点として、２つの光合分波回路１１７及び１１８と、光合波回路１１９〜１２２とを有している。
例えば、図１においては、光合分波回路１１７及び１１８として、波長周回性アレイ導波路回折格子型合分波回路（ＡＷＧ）が用いられ、光合波回路１１９〜１２２としてインターリーバ（導波路型波長スプリッタ）が用いられている。
光合分波回路１１７及び１１８は、入力されたＷＤＭ信号を、後に説明する図２のテーブルの波長と入力及び出力ポートとの関係に基づき、一端、個々の光信号に分波して、このテーブルの関係に対応するように、分波した光信号を多重化して出力する。 Here, the wavelength router 123 of the present embodiment has two optical multiplexing / demultiplexing circuits 117 and 118 and optical multiplexing circuits 119 to 122, which are different from the conventional example shown in FIG.
For example, in FIG. 1, a wavelength-circulating arrayed waveguide diffraction grating type multiplexing / demultiplexing circuit (AWG) is used as the optical multiplexing / demultiplexing circuits 117 and 118, and an interleaver (waveguide wavelength) is used as the optical multiplexing circuits 119 to 122. Splitter) is used.
The optical multiplexing / demultiplexing circuits 117 and 118 demultiplex the input WDM signal into individual optical signals based on the relationship between the wavelength of the table shown in FIG. 2, which will be described later, and the input and output ports. The demultiplexed optical signals are multiplexed and output so as to correspond to the above relationship.

ここで、波長ルータ１２３は、１番目の入力ポートＩＩ１が第一の光合分波回路１１７の１番目の入力ポートＩ１に接続されており、２番目の入力ポートＩＩ２が第二の光合分波回路１１８の２番目の入力ポートＩ２に接続されている。
また、２つの上記光合分波回路１１７及び１１８は、各々１番目の出力ポートＯ１が１番目の光合波回路１１９の入力ポートに接続されている。
ここで、第一の光合分波回路１１７の１番目の出力ポートＯ１が波長λ1,3に対応しており、第二の光合分波回路１１８の１番目の出力ポートＯ１波長λ2,4に対応している。
１番目の光合波回路１１９は、出力ポートが波長ルータ１２３の１番目の出力ポートＯＯ１に接続されている。
同様に、２番目，３番目，４番目の光合波回路１２０，１２１，１２２各々は、波長ルータ１２３の２番目，３番目，４番目の出力ポートＯＯ２，ＯＯ３，ＯＯ４にそれぞれ接続されている。 Here, in the wavelength router 123, the first input port II1 is connected to the first input port I1 of the first optical multiplexing / demultiplexing circuit 117, and the second input port II2 is connected to the second optical multiplexing / demultiplexing circuit. 118 is connected to the second input port I2.
In each of the two optical multiplexing / demultiplexing circuits 117 and 118, the first output port O1 is connected to the input port of the first optical multiplexing circuit 119.
Here, the first output port O1 of the first optical multiplexing / demultiplexing circuit 117 corresponds to the wavelength λ1,3, and corresponds to the first output port O1 wavelength λ2,4 of the second optical multiplexing / demultiplexing circuit 118. is doing.
The first optical multiplexing circuit 119 has an output port connected to the first output port OO 1 of the wavelength router 123.
Similarly, the second, third, and fourth optical multiplexing circuits 120, 121, and 122 are connected to the second, third, and fourth output ports OO2, OO3, and OO4 of the wavelength router 123, respectively.

また、図２は、本発明による、入力ポート及び出力ポートにおける波長の関係、すなわち、光合分波回路１１７及び１１８において、入力ポートから入力される波長と、出力ポートから出力される波長との対応関係を示すテーブルである。
縦の欄に記載された番号Ｉ1〜Ｉ4は光合分波回路１１７及び１１８の入力ポート番号であり、横の欄に記載された番号Ｏ１〜Ｏ４は光合分波回路１１７及び１１８の出力ポート番号である。
例えば、光合分波回路１１７及び１１８においては、上記図２に示すテーブルから、入力ポートＩ１から出力ポートＯ２へ光信号を送信するため、波長λ２の光信号を使用し、逆に入力ポートＩ２から出力ポートＯ１へ光信号を送るには、波長λ２を使えばよいことがわかる。光合分波回路１１７及び１１８における他の入力及び出力ポート間においても同様である。 FIG. 2 shows the relationship between the wavelengths at the input port and the output port according to the present invention, that is, the correspondence between the wavelength input from the input port and the wavelength output from the output port in the optical multiplexing / demultiplexing circuits 117 and 118. It is a table which shows a relationship.
The numbers I1 to I4 described in the vertical column are the input port numbers of the optical multiplexing / demultiplexing circuits 117 and 118, and the numbers O1 to O4 described in the horizontal column are the output port numbers of the optical multiplexing / demultiplexing circuits 117 and 118. is there.
For example, the optical multiplexing / demultiplexing circuits 117 and 118 use the optical signal of wavelength λ2 from the table shown in FIG. 2 to transmit the optical signal from the input port I1 to the output port O2, and conversely from the input port I2. It can be seen that the wavelength λ2 may be used to send an optical signal to the output port O1. The same applies to other input and output ports in the optical multiplexing / demultiplexing circuits 117 and 118.

図１の実施形態において、送信装置１０１（ノード１）及び１０３（ノード３）から送られたＷＤＭ信号は、光合分波回路１１７に入力され、一方、送信装置１０２（ノード２）及び１０４（ノード４）から送られたＷＤＭ信号は光合分波回路１１８に入り、それぞれ波長ルーティングされる。
ここで、波長ルータ１２３の入力ポートＩＩ１，ＩＩ２，ＩＩ３，ＩＩ４各々は、送信装置１０１，１０２，１０３，１０４にそれぞれ対応して接続されている。
そして、インターリーバ１１９〜１２２は、波長ルーティングされたＷＤＭ信号を合波して、各々対応する受信装置１０５〜１０８へ送信される。 In the embodiment of FIG. 1, the WDM signals sent from the transmission apparatuses 101 (node 1) and 103 (node 3) are input to the optical multiplexing / demultiplexing circuit 117, while the transmission apparatuses 102 (node 2) and 104 (nodes). The WDM signal sent from 4) enters the optical multiplexing / demultiplexing circuit 118 and is wavelength-routed respectively.
Here, the input ports II1, II2, II3, and II4 of the wavelength router 123 are connected to the transmission devices 101, 102, 103, and 104, respectively.
Then, interns interleaver 119-122 are multiplexes the WDM signal wavelength-routed, and transmitted to the receiving apparatus 105 to 108, each corresponding.

ここで、隣り合うノード（例えば、ノード１及びノード２）からのＷＤＭ信号は、それぞれ異なった光合分波回路１１７及び１１８で波長ルーティングされるため、波長ルータ１２３における隣接ポートからのクロストーク成分は、光合波回路１１９〜１２２のインターリーブ機能によって除去される。上記隣接ポートとしては、例えば、図１に示すように、入力ポートＩＩ１とＩＩ２とが、または、入力ポートＩＩ３とＩＩ４とが、各々対応している。
また、非隣接ポートからのクロストークを、−４０dB以下に遮蔽する特性を容易に実現できるので、クロストークによる信号劣化が生じない。上記非隣接ポートとしては、例えば、図１に示すように、入力ポートＩＩ１とＩＩ３とが、または、入力ポートＩＩ２とＩＩ４と、または入力ポートＩＩ１とＩＩ４とが、各々対応している。 Here, since WDM signals from adjacent nodes (for example, node 1 and node 2) are wavelength-routed by different optical multiplexing / demultiplexing circuits 117 and 118, crosstalk components from adjacent ports in the wavelength router 123 are Are removed by the interleaving function of the optical multiplexing circuits 119-122. As the adjacent ports, for example, as shown in FIG. 1, the input ports II1 and II2 or the input ports II3 and II4 correspond to each other.
In addition, since the characteristic of shielding the crosstalk from the non-adjacent port to -40 dB or less can be easily realized, signal degradation due to the crosstalk does not occur. As the non-adjacent ports, for example, as shown in FIG. 1, input ports II1 and II3, input ports II2 and II4, or input ports II1 and II4 correspond to each other.

＜第２の実施形態＞
図３は、本発明の第２の実施形態の波長ルータを用いて構成した光波長多重通信システムの構成例を示すブロック図である。
この図において、符号３０１〜３０４は、ＷＤＭ信号(波長λ1〜λ4の光信号を合波した信号)を送信する送信装置である。
符号３０５〜３０８は、ＷＤＭ信号(波長λ1〜λ4の光信号を合波した信号)を受信する受信装置である。
符号３３１は、４ポートの入出力、すなわち入力ポートＩＩ１〜ＩＩ４，出力ポートＯＯ１〜ＯＯ４を有し、周期的な入出力関係の分波特性を有する４×４波長ルータである。 <Second Embodiment>
FIG. 3 is a block diagram showing a configuration example of an optical wavelength division multiplexing communication system configured using the wavelength router according to the second embodiment of the present invention.
In this figure, reference numeral 30 1-304 is a transmitting apparatus for transmitting a WDM signal (multiplexed signal of the optical signal of the wavelength .lambda.1 -.lambda.4).
Reference numerals 305 to 308 denote receiving apparatuses that receive WDM signals (signals obtained by combining optical signals having wavelengths λ1 to λ4).
Reference numeral 331 is a 4 × 4 wavelength router having input / output of four ports, that is, input ports II1 to II4 and output ports OO1 to OO4, and having a demultiplexing characteristic of a periodic input / output relationship.

符号３０９〜３１６は、送受信装置３０１〜３０８と波長ルータ３３１とを接続する光ファイバである。
なお、送受信装置３０１〜３０８の構成は、図６に示した従来例の送受信装置６０１〜６０４と同様である。
ここで、波長ルータ３３１は、２つの光合分波回路３１７及び３１８と、入力される複数の光信号を合波する光合波回路３１９〜３２２と光合流回路３２３〜３３０とを有している。
図３に示す構成例においては、光合分波回路３１７及び３１８として、４×８アレイ導波路回折格子型合分波回路（ＡＷＧ）を用い、光合波回路３１９〜３２２としてインターリーバを用い、光合流回路３２３〜３３０として光カプラを用いている。
光合分波回路３１７及び３１８は、Ｎ本の入力ポートと２Ｎ本の出力ポートを備え、入力されたＷＤＭ信号を、後に説明する図４のテーブルの波長と入力及び出力ポートとの関係に基づき、一端、個々の光信号に分波して、このテーブルの関係に対応するように、分波した光信号を多重化して出力する。 Reference numerals 309 to 316 denote optical fibers that connect the transmission / reception apparatuses 301 to 308 and the wavelength router 331.
The configuration of the transmission / reception devices 301 to 308 is the same as that of the conventional transmission / reception devices 601 to 604 shown in FIG.
Here, the wavelength router 331 includes two optical multiplexing and demultiplexing circuit 317 and 318, and an optical multiplexer multiplexing circuit 319-322 for multiplexing a plurality of optical signals inputted to the optical coupling circuit 323-330.
In the configuration example shown in FIG. 3, as the optical multiplexing and demultiplexing circuit 317 and 318, using a 4 × 8 array waveguide diffraction grating type multiplexing and demultiplexing circuit (AWG), the interns interleaver as an optical multiplexing circuit 3 1 9-322 In addition, optical couplers are used as the optical combining circuits 323 to 330.
The optical multiplexing / demultiplexing circuits 317 and 318 are provided with N input ports and 2N output ports, and the input WDM signal is converted based on the relationship between the wavelength and the input and output ports in the table shown in FIG. At one end, the optical signals are demultiplexed into individual optical signals, and the optical signals thus demultiplexed are multiplexed and output so as to correspond to the relationship of this table.

ここで、波長ルータ３３１は、１番目の入力ポートＩＩ１が、第一の光合分波回路３１７の１番目の入力ポートＩ１に接続され、２番目の入力ポートＩＩ２が、第二の光合分波回路３１８の２番目の入力ポートＩ２に接続されている。
一方、光合分波回路３１７は、１番目および５番目の出力ポートＯ１，Ｏ５が、１番目の光合流回路３２３の入力ポートに接続されている。
また、光合分波回路３１８は、１番目および５番目の出力ポートＯ１，Ｏ５が、５番目の光合流回路３２７の入力ポートに接続されている。
さらに、１番目の光合流回路３２３および５番目の光合流回路３２７各々の出力ポートは、１番目の光合波回路３１９の入力ポートに接続され、この１番目の光合波回路３１９の出力ポートは、波長ルータ３３１の１番目の出力ポートＯＯ１に接続されている。 Here, in the wavelength router 331, the first input port II1 is connected to the first input port I1 of the first optical multiplexing / demultiplexing circuit 317, and the second input port II2 is connected to the second optical multiplexing / demultiplexing circuit. 318 is connected to the second input port I2.
On the other hand, in the optical multiplexing / demultiplexing circuit 317, the first and fifth output ports O 1 and O 5 are connected to the input port of the first optical combining circuit 323.
In the optical multiplexing / demultiplexing circuit 318, the first and fifth output ports O1, O5 are connected to the input port of the fifth optical combining circuit 327.
Furthermore, the output ports of the first optical combining circuit 323 and the fifth optical combining circuit 327 are connected to the input ports of the first optical combining circuit 319, and the output ports of the first optical combining circuit 319 are: It is connected to the first output port OO1 of the wavelength router 331 .

図４は、本発明による光合分波回路３１７及び３１８における入力ポートと出力ポートとの波長の関係、すなわち、光合分波回路３１７及び３１８において、入力ポートから入力される波長と、出力ポートから出力される波長との対応関係を示すテーブルである。
番号ＩＩ１〜ＩＩ４は波長ルータの入力ポート番号であり、番号ＯＯ１〜ＯＯ４は出力ポート番号である。
光合分波回路３１７は、図４に示すテーブルに基づいて、入力ポートＩ１から入力されたＷＤＭ信号において、波長λ1〜λ4各々の光信号を、出力ポートＯ５〜Ｏ８に対して順次出力する。
同様に、光合分波回路３１８は、入力ポートＩ２から入力されたＷＤＭ信号において、波長λ1〜λ4の光信号を、出力ポートＯ４〜Ｏ７へ順次出力する。 FIG. 4 shows the relationship between the wavelength of the input port and the output port in the optical multiplexing / demultiplexing circuits 3 17 and 318 according to the present invention, that is, the wavelength input from the input port in the optical multiplexing / demultiplexing circuits 3 17 and 3 It is a table which shows the correspondence with the wavelength output from a port.
Numbers II1 to II4 are input port numbers of the wavelength router, and numbers OO1 to OO4 are output port numbers.
Optical wavelength division multiplexing circuit 317, based on the table shown in FIG. 4, the WDM signal inputted from the input port I1, the wavelength λ1~λ4 respective optical signals, and sequentially output to the output port O5～O8.
Similarly, the optical multiplexing / demultiplexing circuit 318 sequentially outputs optical signals having wavelengths λ1 to λ4 to the output ports O4 to O7 in the WDM signal input from the input port I2.

図３において、各ノード（送受信装置３０１〜３０４）から送られたＷＤＭ信号は、光合分波回路３１７及び３１８において分波され、光カプラ３２３〜３３０において合波され、さらにインターリーバ３１９〜３２２において合波されてＷＤＭ信号となり、出力光ファイバ３１３〜３１６各々に出力される。
ここで、隣り合うノード（例えば、ノード１及びノード２）からのＷＤＭ信号は、それぞれ異なった光合分波回路３１７及び３１８により波長ルーティングされる。
これにより、波長ルータ３３１においては、図７で説明したような隣接ポートからのクロストーク成分が、光合波回路３１９〜３２２のインターリーブ機能により除去される。上記隣接ポートとしては、例えば、図３に示すように、入力ポートＩＩ１とＩＩ２とが、または、入力ポートＩＩ３とＩＩ４とが、各々対応している。 In FIG. 3, WDM signal sent from each node (transceiver 301-304) is demultiplexed in the optical multiplexing and demultiplexing circuit 317 and 318 are multiplexed in the optical coupler 323 to 330, further interns interleaver 319-322 Are combined into a WDM signal and output to each of the output optical fibers 313 to 316.
Here, WDM signals from adjacent nodes (for example, node 1 and node 2) are wavelength-routed by different optical multiplexing / demultiplexing circuits 317 and 318, respectively.
Thereby, in the wavelength router 331 , the crosstalk component from the adjacent port as described in FIG. 7 is removed by the interleaving function of the optical multiplexing circuits 319 to 322. As the adjacent ports, for example, as shown in FIG. 3, the input ports II1 and II2 or the input ports II3 and II4 correspond to each other.

また、非隣接ポートからのクロストークを、−４０dB以下に遮蔽する特性を容易に実現できるので、クロストークによる信号劣化が生じない。上記非隣接ポートとしては、例えば、図３に示すように、入力ポートＩＩ１とＩＩ３とが、または、入力ポートＩＩ２とＩＩ４と、または入力ポートＩＩ１とＩＩ４とが、各々対応している。
ここで，光合流回路３２３〜３３０として、光カプラの替わりにインターリーバを用いることもできる。
以上の第１及び第２の実施形態においては、光合波回路や光合分波回路として単一素子のＡＷＧを用いたが、他の素子、例えば分波ＡＷＧとファイバ配線の組み合わせ、あるいは誘電体多層膜を用いた合分波回路とファイバ配線の組み合わせでも、同様の効果が得られる。 In addition, since the characteristic of shielding the crosstalk from the non-adjacent port to -40 dB or less can be easily realized, signal degradation due to the crosstalk does not occur. As the non-adjacent ports, for example, as shown in FIG. 3, input ports II1 and II3, input ports II2 and II4, or input ports II1 and II4 correspond to each other .
Here, as the optical combining circuits 323 to 330, an interleaver can be used instead of the optical coupler.
In the first and second embodiments described above, a single element AWG is used as the optical multiplexing circuit or the optical multiplexing / demultiplexing circuit. However, other elements, for example, a combination of the demultiplexing AWG and fiber wiring, or a dielectric multilayer The same effect can be obtained by combining a multiplexing / demultiplexing circuit using a film and fiber wiring.

本発明の第１の実施形態による波長ルータを用いて構成した光波長多重通信システムを示す概略図である。It is the schematic which shows the optical wavelength division multiplexing communication system comprised using the wavelength router by the 1st Embodiment of this invention. 本発明の第１の実施形態による波長ルータの入力及び出力ポートの波長の関係を示すテーブルである。It is a table which shows the relationship of the wavelength of the input and output port of the wavelength router by the 1st Embodiment of this invention. 本発明の第２の実施形態による波長ルータを用いて構成した光波長多重通信システムを示す概略図である。It is the schematic which shows the optical wavelength division multiplexing communication system comprised using the wavelength router by the 2nd Embodiment of this invention. 本発明の第２の実施形態による波長ルータの入出力ポートの波長の関係を示す表である。It is a table | surface which shows the relationship of the wavelength of the input / output port of the wavelength router by the 2nd Embodiment of this invention. 従来の波長ルータを用いて構成した光波長多重通信システムを示す概略図である。It is the schematic which shows the optical wavelength division multiplexing communication system comprised using the conventional wavelength router. 従来の波長ルータを用いた光波長多重通信システムの概略構成例を示すブロック図である。It is a block diagram which shows the schematic structural example of the optical wavelength division multiplexing communication system using the conventional wavelength router. 従来の波長ルータにおける隣接チャネルへのクロストークを説明する図である。It is a figure explaining the crosstalk to the adjacent channel in the conventional wavelength router.

Explanation of symbols

１０１，１０２，１０３，１０４…送信装置
１０５，１０６，１０７，１０８…受信装置
１０９，１１０，１１１，１１２，１１３，１１４，１１５，１１６…光ファイバ
１１７，１１８…光合分波回路
１１９，１２０，１２１，１２２…光合波回路
３０１，３０２，３０３，３０４…送信装置
３０５，３０６，３０７，３０８…受信装置
３０９，３１０，３１１，３１２，３１３，３１４，３１５，３１６…光ファイバ
３１７，３１８…光合分波回路
３１９，３２０，３２１，３２２…光合波回路
101, 102, 103, 104 ... transmitting device 105, 106, 107, 108 ... receiving device 109, 110, 111, 112, 113, 114, 115, 116 ... optical fiber 117, 118 ... optical multiplexing / demultiplexing circuit 119, 120, 121, 122 ... Optical multiplexing circuit 301, 302, 303, 304 ... Transmitting device 305, 306, 307, 308 ... Receiving device 309, 310, 311, 312, 313, 314, 315, 316 ... Optical fiber 317, 318 ... Optical multiplexing Demultiplexing circuit 319, 320, 321, 322 ... Optical multiplexing circuit

Claims

A first optical multiplexing / demultiplexing circuit having four input ports and four output ports, having wavelength recursion, a second optical multiplexing / demultiplexing circuit, and four optical multiplexing circuits composed of an interleaver A wavelength router that
Each of the first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit includes four input ports and four output ports, and outputs an input wavelength multiplexed optical signal to a predetermined output port according to the wavelength. Has the function to
Each of the optical multiplexing circuits includes two input ports and one output port,
The Mth input port (M is an integer in the range of 1 ≦ M ≦ 4) of the wavelength router is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit when M is an odd number, and M Is even, it is connected to the Mth input port of the second optical multiplexing / demultiplexing circuit,
M-th output ports of the two optical multiplexing / demultiplexing circuits are respectively connected to input ports of the M-th optical multiplexing / demultiplexing circuit,
The wavelength router, wherein an output port of the Mth optical multiplexing circuit is connected to an Mth output port of the wavelength router.

First and second optical multiplexing / demultiplexing circuits having four input ports and eight output ports, and first and second having two input ports and one output port , A third, fourth, fifth, sixth, seventh and eighth optical combining circuit, and a first, second, third and fourth optical combining circuit comprising an interleaver Because
Each of the first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit includes four input ports and eight output ports, and outputs an input wavelength multiplexed optical signal to a predetermined output port according to the wavelength. Has the function to
Each of the first, second, third and fourth optical multiplexing circuits comprises two input ports and one output port;
The Mth input port (M is an integer in the range of 1 ≦ M ≦ 4) of the wavelength router is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit when M is an odd number, and M Is even, it is connected to the Mth input port of the second optical multiplexing / demultiplexing circuit,
The first and fifth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the first optical multiplexing circuit, respectively.
The second and sixth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the second optical multiplexing circuit, respectively.
The third and seventh output ports of the first optical multiplexing / demultiplexing circuit are respectively connected to the first and second input ports of the third optical multiplexing circuit,
The fourth and eighth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the fourth optical multiplexing circuit, respectively.
The first and fifth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the fifth optical multiplexing circuit, respectively.
The second and sixth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the sixth optical multiplexing circuit, respectively.
The third and seventh output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the seventh optical multiplexing circuit, respectively.
The fourth and eighth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the eighth optical multiplexing circuit, respectively.
The output ports of the first and fifth optical multiplexing circuits are respectively connected to the input ports of the first optical multiplexing circuit,
The output ports of the second and sixth optical multiplexing circuits are respectively connected to the input ports of the second optical multiplexing circuit,
The output ports of the third and seventh optical combining circuits are respectively connected to the input ports of the third optical combining circuit,
The output ports of each of the fourth and eighth optical combining circuits are connected to the input ports of the fourth optical combining circuit, respectively.
The wavelength router, wherein an output port of the M-th optical multiplexing circuit is connected to an M-th output port of the wavelength router.

The wavelength router according to claim 1 or 2, wherein the first and second optical multiplexing / demultiplexing circuits are arrayed waveguide diffraction gratings.

A plurality of optical transmitters that generate optical signals having different wavelengths, and an optical transmission means that includes a multiplexer that multiplexes output optical signals of the plurality of optical transmitters; The first optical fiber transmission line to which the output optical signal of the transmitting means is input and the plurality of first optical fiber transmission lines are connected to different input ports, respectively, and the output input from the input port A path is assigned according to the wavelength of the optical signal, and the output optical signal thus distributed is output from an output port of a corresponding wavelength, and a first optical fiber connected to each of the output ports of the wavelength router is formed of one optical fiber. 2 optical fiber transmission lines, a demultiplexer for demultiplexing an optical signal transmitted by the second optical fiber transmission line for each wavelength, and receiving an optical signal for each wavelength demultiplexed by the demultiplexer. Multiple In the optical wavelength multiplexing transmission system that includes a light receiving means and an optical receiver,
The wavelength router includes four input ports and four output ports, and includes four first and second optical multiplexing / demultiplexing circuits each having wavelength reciprocity and an interleaver. A wavelength router having an optical multiplexing circuit;
Each of the first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit includes four input ports and four output ports, and outputs an input wavelength multiplexed optical signal to a predetermined output port according to the wavelength. Has the function to
Each of the optical multiplexing circuits includes two input ports and one output port,
The Mth input port (M is an integer in the range of 1 ≦ M ≦ 4) of the wavelength router is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit when M is an odd number, and M Is even, it is connected to the Mth input port of the second optical multiplexing / demultiplexing circuit,
M-th output ports of the two optical multiplexing / demultiplexing circuits are respectively connected to input ports of the M-th optical multiplexing / demultiplexing circuit,
An optical wavelength division multiplexing transmission system, wherein an output port of the Mth optical multiplexing circuit is connected to an Mth output port of the wavelength router.

A plurality of optical transmitters that generate optical signals having different wavelengths, and an optical transmission means that includes a multiplexer that multiplexes output optical signals of the plurality of optical transmitters; The first optical fiber transmission line to which the output optical signal of the transmitting means is input and the plurality of first optical fiber transmission lines are connected to different input ports, respectively, and the output input from the input port A path is assigned according to the wavelength of the optical signal, and the output optical signal thus distributed is output from an output port of a corresponding wavelength, and a first optical fiber connected to each of the output ports of the wavelength router is formed of one optical fiber. 2 optical fiber transmission lines, a demultiplexer for demultiplexing an optical signal transmitted by the second optical fiber transmission line for each wavelength, and receiving an optical signal for each wavelength demultiplexed by the demultiplexer. Multiple In the optical wavelength multiplexing transmission system that includes a light receiving means and an optical receiver,
The wavelength router includes a first optical multiplexing / demultiplexing circuit having four input ports and eight output ports, a second optical multiplexing / demultiplexing circuit, two input ports, and one output port. First, second, third, fourth, fifth, sixth, seventh and eighth optical combining circuits, and first, second, third and fourth optical combining circuits composed of an interleaver A wavelength router comprising:
Each of the first optical multiplexing / demultiplexing circuit and the second optical multiplexing / demultiplexing circuit includes four input ports and eight output ports, and outputs an input wavelength multiplexed optical signal to a predetermined output port according to the wavelength. Has the function to
Each of the optical multiplexing circuits includes two input ports and one output port,
The Mth input port (M is an integer in the range of 1 ≦ M ≦ 4) of the wavelength router is connected to the Mth input port of the first optical multiplexing / demultiplexing circuit when M is an odd number, and M Is even, it is connected to the Mth input port of the second optical multiplexing / demultiplexing circuit,
The first and fifth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the first optical multiplexing circuit, respectively.
The second and sixth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the second optical multiplexing circuit, respectively.
The third and seventh output ports of the first optical multiplexing / demultiplexing circuit are respectively connected to the first and second input ports of the third optical multiplexing circuit,
The fourth and eighth output ports of the first optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the fourth optical multiplexing circuit, respectively.
The first and fifth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the fifth optical multiplexing circuit, respectively.
The second and sixth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the sixth optical multiplexing circuit, respectively.
The third and seventh output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the seventh optical multiplexing circuit, respectively.
The fourth and eighth output ports of the second optical multiplexing / demultiplexing circuit are connected to the first and second input ports of the eighth optical multiplexing circuit, respectively.
The output ports of the first and fifth optical multiplexing circuits are respectively connected to the input ports of the first optical multiplexing circuit,
The output ports of the second and sixth optical multiplexing circuits are respectively connected to the input ports of the second optical multiplexing circuit,
The output ports of the third and seventh optical combining circuits are respectively connected to the input ports of the third optical combining circuit,
The output ports of each of the fourth and eighth optical combining circuits are connected to the input ports of the fourth optical combining circuit, respectively.
An optical wavelength division multiplexing transmission system, wherein an output port of the Mth optical multiplexing circuit is connected to an Mth output port of the wavelength router.