JP3984171B2 - Relay device and setting method thereof - Google Patents
Relay device and setting method thereof Download PDFInfo
- Publication number
- JP3984171B2 JP3984171B2 JP2003009392A JP2003009392A JP3984171B2 JP 3984171 B2 JP3984171 B2 JP 3984171B2 JP 2003009392 A JP2003009392 A JP 2003009392A JP 2003009392 A JP2003009392 A JP 2003009392A JP 3984171 B2 JP3984171 B2 JP 3984171B2
- Authority
- JP
- Japan
- Prior art keywords
- wavelength
- optical
- optical signal
- multiplexing device
- demultiplexing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Description
【０００１】
【発明の属する技術分野】
この発明は、光波長分割多重（ＷＤＭ）方式による光通信ネットワークを構成する中継装置に関する。
【０００２】
【従来の技術】
光波長分割多重信号を送信する送信機及び光波長分割多重信号を受信する受信機を備えた複数の通信ノード間で光波長分割多重（ＷＤＭ）方式による光通信ネットワークを構成する場合、各通信ノードを、それぞれの光信号を互いに輻輳することなく伝達可能な中継装置に接続する必要がある。
【０００３】
図３はＮ入力Ｎ出力（ここでは８入力８出力）の波長周回性アレイ導波路回折格子による従来の中継装置の一例を示すもので、図中、１０−１〜１０−８は通信ノードの送信機、２０−１〜２０−８は通信ノードの受信機、３０は波長周回性アレイ導波路回折格子（中継装置）である。
【０００４】
波長周回性アレイ導波路回折格子３０は、８個の入力ポート３１−１〜３１−８及び８個の出力ポート３２−１〜３２−８を有し、第ｋ（ｋ＝１，２，…８）番目の入力ポート３１−ｋは第ｋ番目の通信ノードの送信機１０−ｋと光ファイバ等の光伝送路により接続され、また、第ｋ番目の出力ポート３２−ｋは第ｋ番目の通信ノードの受信機２０−ｋと光ファイバ等の光伝送路により接続される。
【０００５】
送信機１０から波長分割多重されて送られてきた波長λ１〜λ８（λ１＜λ２＜λ３＜λ４＜λ５＜λ６＜λ７＜λ８、又はλ１＞λ２＞λ３＞λ４＞λ５＞λ６＞λ７＞λ８）の光信号は、波長周回性アレイ導波路回折格子３０の該当する入力ポート３１に入力されると、アレイ導波路回折格子３０の波長分波機能により、波長毎に異なる出力ポート３２からそれぞれ出力される。
【０００６】
図４は波長周回性アレイ導波路回折格子３０の入力ポート３１−１〜３１−８及び出力ポート３２−１〜３２−８間を結ぶ波長の関係を表で示したものである。特にアレイ導波路回折格子３０が波長周回性を有することにより８×８通りの入出力を８種類の波長を用いて実現することができる（特許文献１参照）。
【０００７】
【特許文献１】
特開２０００−２０１１１２号公報
【０００８】
【発明が解決しようとする課題】
しかしながら、前述したＮ入力Ｎ出力の波長周回性アレイ導波路回折格子による中継装置を用いた場合、Ｎより少ないＭ個の通信ノードを収容するネットワークを、連続した波長の光信号を用いて構成しようとすると、必要な波長の数は２Ｍ−１とＮのうち小さい方の値（例えば、８入力８出力の波長周回性アレイ導波路回折格子を用いて４つの通信ノード間を接続するためには７波長が必要であり、１６入力１６出力の波長周回性アレイ導波路回折格子を用いて７つの通信ノード間を接続するためには１３波長が必要）になる。
【０００９】
これは波長周回性アレイ導波路回折格子の入出力特性において、一部分の入出力関係のみに着目すると、波長周回性が満たされていないためである。
【００１０】
ネットワークに収容できる通信ノード数の上限はＮであるから、将来の拡張性を見込んでＮの大きな波長周回性アレイ導波路回折格子による中継装置を用いてネットワークを構築すると、通信ノード数が少ない初期導入時においても多数の波長の光信号が必要となり、使用する波長数を少なくできる特徴が生かせないという問題があった。
【００１１】
本発明は、上記従来の欠点に鑑みてなされたもので、収容可能な通信ノード数の上限値に比べて実際に収容する通信ノードの数が少ない時に、連続した波長の光信号を用いてネットワークを構成するために必要な波長数が少なくて済む中継装置を提供することを目的とする。
【００１２】
【課題を解決するための手段】
上記の課題を解決するため、この発明では、光波長分割多重信号を送信する送信機及び光波長分割多重信号を受信する受信機を備えた通信ノード間を接続して光通信ネットワークを構成する中継装置であって、
光伝送路を介して通信ノードの送信機にそれぞれ接続される２n（ｎは２以上の任意の整数）個の入力ポートと、光伝送路を介して通信ノードの受信機にそれぞれ接続される２n個の出力ポートと、各入力ポートに対応して設けられ、前記送信機からの光波長分割多重信号を波長毎の光信号に分波する波長分波装置と、各出力ポートに対応して設けられ、波長毎の光信号を光波長分割多重信号に合波して前記受信機に送出する波長合波装置と、波長分波装置と波長合波装置との間を接続する複数の光導波路とからなり、
ａ，Ａは０以上でｎ以下の整数、ｂは０以上で２a-1未満の整数（但し、ａ＝０の場合はｂ＝０のみとする）、Ｂは０以上で２A-1未満の整数（但し、Ａ＝０の場合はＢ＝０のみとする）とし、光信号の波長を１からの連番で表すものとする時、
１番目の波長分波装置及び１番目の波長合波装置を結ぶ光導波路は、番号１の波長の光信号を出力する前記波長分波装置の出力端と、当該番号１の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
２a−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路は、
ａ＝Ａの時（但し、ａ＝Ａ＝０の場合は除く）は、２a-1−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＞Ａの時は、２a-1−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２a-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＜Ａの時は、２a−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２A-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとした中継装置を提案する。
【００１３】
前記構成によれば、２i（ｉ＝１，２，……ｎ）を単位とする数の入力ポート及び出力ポート間で波長周回性が満たされることになるため、収容可能な通信ノード数の上限値Ｎ（但し、Ｎ＝２n）より少ないＭ個の通信ノードを収容するネットワークを、連続した波長の光信号を用いて構成する場合に必要な波長の数が２iのうちＭ以上で最小の値（例えば、８入力８出力（ｎ＝３）の中継装置を用いて４つの通信ノード間を接続するために必要な波長の数は４、１６入力１６出力（ｎ＝４）の中継装置を用いて７つの通信ノード間を接続するために必要な波長の数は８）となり、従来に比べて必要な波長数を削減することができる。
【００１４】
【発明の実施の形態】
以下、本発明を詳しく説明する。
【００１５】
図１は本発明の中継装置の実施の形態の一例を示すもので、図中、１０−１〜１０−８は通信ノードの送信機、２０−１〜２０−８は通信ノードの受信機、４０は本発明の中継装置である。
【００１６】
中継装置４０は、２n（ｎは２以上の任意の整数）個、ここでは８（ｎ＝３）個の入力ポート４１−１〜４１−８と、８個の出力ポート４２−１〜４２−８と、各入力ポートに対応して設けられ、光波長分割多重信号を波長毎の光信号に分波する波長分波装置４３−１〜４３−８と、各出力ポートに対応して設けられ、波長毎の光信号を光波長分割多重信号に合波する波長合波装置４４−１〜４４−８と、波長分波装置４３−１〜４３−８と波長合波装置４４−１〜４４−８との間を接続する複数の光導波路４５とからなっている。
【００１７】
ここで、光導波路４５は、波長分波装置４３−１〜４３−８と波長合波装置４４−１〜４４−８との間を、２i（ｉ＝１，２，３）を単位とする数の入力ポート及び出力ポート間で波長周回性が満たされるように設定・配置する、具体的には以下のように設定・配置する。
【００１８】
即ち、ａ，Ａは０以上でｎ以下の整数、ｂは０以上で２a-1未満の整数（但し、ａ＝０の場合はｂ＝０のみとする）、Ｂは０以上で２A-1未満の整数（但し、Ａ＝０の場合はＢ＝０のみとする）とし、光信号の波長を１からの連番で表すものとする時、
１番目の波長分波装置及び１番目の波長合波装置を結ぶ光導波路は、番号１の波長の光信号を出力する前記波長分波装置の出力端と、当該番号１の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
２a−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路は、
ａ＝Ａの時（但し、ａ＝Ａ＝０の場合は除く）は、２a-1−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＞Ａの時は、２a-1−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２a-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＜Ａの時は、２a−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２A-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとする、ように設定・配置する。
【００１９】
以下、ｎ＝２（４入力４出力）の場合の設定の過程について説明する。
【００２０】
まず、１番目の波長分波装置４３−１及び１番目の波長合波装置４４−１を結ぶ光導波路（ａ＝０、Ａ＝０、ｂ＝０、Ｂ＝０）は、１番目の波長、即ち波長λ１の光信号を出力する波長分波装置４３−１の出力端と、当該波長λ１の光信号を入力する波長合波装置４４−１の入力端との間を結ぶ。
【００２１】
次に、ａに１を加算した時（ａ＝１、Ａ＝０、ｂ＝０、Ｂ＝０）の波長分波装置４３−２及び波長合波装置４４−１を結ぶ光導波路は、２a-1−ｂ＝１番目の波長分波装置及び２A−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長λ１に対し２a-1＝１を加えた番号、即ち波長λ２の光信号を出力する波長分波装置４３−２の出力端と、当該波長λ２の光信号を入力する波長合波装置４４−１の入力端との間を結ぶ。
【００２２】
ａにさらに１を加算した時（ａ＝２、Ａ＝０、ｂ＝０、Ｂ＝０）の波長分波装置４３−４及び波長合波装置４４−１を結ぶ光導波路は、２a-1−ｂ＝２番目の波長分波装置及び２A−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長λ２に対し２a-1＝２を加えた番号、即ち波長λ４の光信号を出力する波長分波装置４３−４の出力端と、当該波長λ２の光信号を入力する波長合波装置４４−１の入力端との間を結ぶ。
【００２３】
さらにｂに１を加算した時（ａ＝２、Ａ＝０、ｂ＝１、Ｂ＝０）の波長分波装置４３−３及び波長合波装置４４−１を結ぶ光導波路は、２a-1−ｂ＝１番目の波長分波装置及び２A−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長λ１に対し２a-1＝２を加えた番号、即ち波長λ３の光信号を出力する波長分波装置４３−３の出力端と、当該波長λ２の光信号を入力する波長合波装置４４−１の入力端との間を結ぶ。
【００２４】
次に、ａ，ｂを０に戻し、Ａに１を加算した時（ａ＝０、Ａ＝１、ｂ＝０、Ｂ＝０）の波長分波装置４３−１及び波長合波装置４４−２を結ぶ光導波路は、２a−ｂ＝１番目の波長分波装置及び２A-1−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長λ１に対し２A-1＝１を加えた番号、即ち波長λ２の光信号を出力する波長分波装置４３−１の出力端と、当該波長λ２の光信号を入力する波長合波装置４４−２の入力端との間を結ぶ。
【００２５】
さらにａに１を加算した時（ａ＝１、Ａ＝１、ｂ＝０、Ｂ＝０）の波長分波装置４３−２及び波長合波装置４４−２を結ぶ光導波路は、２a-1−ｂ＝１番目の波長分波装置及び２A-1−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長、即ち波長λ１の光信号を出力する波長分波装置４３−２の出力端と、当該波長λ１の光信号を入力する波長合波装置４４−２の入力端との間を結ぶ。
【００２６】
ａにさらに１を加算した時（ａ＝２、Ａ＝１、ｂ＝０、Ｂ＝０）の波長分波装置４３−４及び波長合波装置４４−２を結ぶ光導波路は、２a-1−ｂ＝２番目の波長分波装置及び２A−Ｂ＝２番目の波長合波装置を結ぶ光導波路を通る波長λ１に対し２a-1＝２を加えた番号、即ち波長λ３の光信号を出力する波長分波装置４３−４の出力端と、当該波長λ３の光信号を入力する波長合波装置４４−２の入力端との間を結ぶ。
【００２７】
さらにｂに１を加算した時（ａ＝２、Ａ＝１、ｂ＝１、Ｂ＝０）の波長分波装置４３−３及び波長合波装置４４−２を結ぶ光導波路は、２a-1−ｂ＝１番目の波長分波装置及び２A−Ｂ＝２番目の波長合波装置を結ぶ光導波路を通る波長λ２に対し２a-1＝２を加えた番号、即ち波長λ４の光信号を出力する波長分波装置４３−３の出力端と、当該波長λ４の光信号を入力する波長合波装置４４−２の入力端との間を結ぶ。
【００２８】
次に、ａ，ｂを０に戻し、Ａにさらに１を加算した時（ａ＝０、Ａ＝２、ｂ＝０、Ｂ＝０）の波長分波装置４３−１及び波長合波装置４４−４を結ぶ光導波路は、２a−ｂ＝１番目の波長分波装置及び２A-1−Ｂ＝２番目の波長合波装置を結ぶ光導波路を通る波長λ２に対し２A-1＝２を加えた番号、即ち波長λ４の光信号を出力する波長分波装置４３−１の出力端と、当該波長λ４の光信号を入力する波長合波装置４４−４の入力端との間を結ぶ。
【００２９】
さらにａに１を加算した時（ａ＝１、Ａ＝２、ｂ＝０、Ｂ＝０）の波長分波装置４３−２及び波長合波装置４４−４を結ぶ光導波路は、２a−ｂ＝２番目の波長分波装置及び２A-1−Ｂ＝２番目の波長合波装置を結ぶ光導波路を通る波長λ１に対し２A-1＝２を加えた番号、即ち波長λ３の光信号を出力する波長分波装置４３−２の出力端と、当該波長λ３の光信号を入力する波長合波装置４４−４の入力端との間を結ぶ。
【００３０】
ａにさらに１を加算した時（ａ＝２、Ａ＝２、ｂ＝０、Ｂ＝０）の波長分波装置４３−４及び波長合波装置４４−４を結ぶ光導波路は、２a-1−ｂ＝２番目の波長分波装置及び２A-1−Ｂ＝２番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長、即ち波長λ１の光信号を出力する波長分波装置４３−４の出力端と、当該波長λ１の光信号を入力する波長合波装置４４−４の入力端との間を結ぶ。
【００３１】
さらにｂに１を加算した時（ａ＝２、Ａ＝２、ｂ＝１、Ｂ＝０）の波長分波装置４３−３及び波長合波装置４４−４を結ぶ光導波路は、２a-1−ｂ＝１番目の波長分波装置及び２A-1−Ｂ＝２番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長、即ち波長λ２の光信号を出力する波長分波装置４３−３の出力端と、当該波長λ２の光信号を入力する波長合波装置４４−４の入力端との間を結ぶ。
【００３２】
次に、ａ，ｂを０に戻し、さらにＢに１を加算した時（ａ＝０、Ａ＝２、ｂ＝０、Ｂ＝１）の波長分波装置４３−１及び波長合波装置４４−３を結ぶ光導波路は、２a−ｂ＝１番目の波長分波装置及び２A-1−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長λ１に対し２A-1＝２を加えた番号、即ち波長λ３の光信号を出力する波長分波装置４３−１の出力端と、当該波長λ３の光信号を入力する波長合波装置４４−３の入力端との間を結ぶ。
【００３３】
さらにａに１を加算した時（ａ＝１、Ａ＝２、ｂ＝０、Ｂ＝１）の波長分波装置４３−２及び波長合波装置４４−３を結ぶ光導波路は、２a−ｂ＝２番目の波長分波装置及び２A-1−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長λ２に対し２A-1＝２を加えた番号、即ち波長λ４の光信号を出力する波長分波装置４３−２の出力端と、当該波長λ４の光信号を入力する波長合波装置４４−３の入力端との間を結ぶ。
【００３４】
ａにさらに１を加算した時（ａ＝２、Ａ＝２、ｂ＝０、Ｂ＝１）の波長分波装置４３−４及び波長合波装置４４−３を結ぶ光導波路は、２a-1−ｂ＝２番目の波長分波装置及び２A-1−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長、即ち波長λ２の光信号を出力する波長分波装置４３−４の出力端と、当該波長λ２の光信号を入力する波長合波装置４４−３の入力端との間を結ぶ。
【００３５】
さらにｂに１を加算した時（ａ＝２、Ａ＝２、ｂ＝１、Ｂ＝１）の波長分波装置４３−３及び波長合波装置４４−３を結ぶ光導波路は、２a-1−ｂ＝１番目の波長分波装置及び２A-1−Ｂ＝１番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長、即ち波長λ１の光信号を出力する波長分波装置４３−３の出力端と、当該波長λ１の光信号を入力する波長合波装置４４−３の入力端との間を結ぶ。
【００３６】
図２は光導波路４５によって結ばれる波長分波装置４３−１〜４３−８及び波長合波装置４４−１〜４４−８間の波長の関係、実質的に中継装置４０の入力ポート４１−１〜４１−８及び出力ポート４２−１〜４２−８間を結ぶ波長の関係を表で示したものである。
【００３７】
中継装置４０の入力ポート４１−１〜４１−８及び出力ポート４２−１〜４２−８は、従来の場合と同様、第ｋ（ｋ＝１，２，…８）番目の入力ポート４１−ｋは第ｋ番目の通信ノードの送信機１０−ｋと光ファイバ等の光伝送路により接続され、また、第ｋ番目の出力ポート４２−ｋは第ｋ番目の通信ノードの受信機２０−ｋと光ファイバ等の光伝送路により接続される。
【００３８】
第ｋ番目の通信ノードの送信機１０−ｋから光伝送路を介して送られてきた波長λ１〜λ８の光波長分割多重信号は、中継装置４０の該当する入力ポート４１−ｋに入力され、波長分波装置４３−ｋに入力され、分波される。分波された光信号は、光導波路４５を介して波長合波装置４４−１〜４４−８のいずれかにそれぞれ入力される。
【００３９】
一方、第ｋ番目の波長合波装置４４−ｋは、波長分波装置４３−１〜４３−８のいずれかからそれぞれ入力された波長λ１〜λ８の光信号を合波して光波長分割多重信号を生成する。波長合波装置４４−ｋにて生成された光波長分割多重信号は、中継装置４０の該当する出力ポート４２−ｋから出力され、光伝送路を介して通信ノードの受信機２０−ｋに送られる。
【００４０】
図２からも分かるように、前述した中継装置４０においては、２i（ｉ＝１，２，３，４）を単位とする数の入力ポート及び出力ポート間で波長周回性が満たされているため、８個の通信ノード間の接続をλ１からλ８までの８つの波長を用いて実現できる外、４個以下の通信ノード間の接続をλ１からλ４までの４つの波長（１番目から４番目までの入力ポート及び出力ポート、又は５番目から８番目までの入力ポート及び出力ポートを用いて）もしくはλ５からλ８までの４つの波長（１番目から４番目までの入力ポート及び５番目から８番目までの出力ポート、又は５番目から８番目までの入力ポート及び１番目から４番目までの出力ポートを用いて）を用いて実現でき、また、２個以下の通信ノード間の接続についても、λ１，λ２の２つの波長もしくはλ３，λ４の２つの波長もしくはλ５，λ６の２つの波長もしくはλ７，λ８の２つの波長を用いて前記同様に実現できる。
【００４１】
なお、前述した中継装置における波長分波装置及び波長合波装置としては、アレイ導波路回折格子を用いることができ、また、光導波路としては光ファイバを用いることができる。また、前述した実施の形態では、入力ポート及び出力ポートの数が８（ｎ＝３）個の場合を示しているが、これに限定されるものではない。
【００４２】
【発明の効果】
以上説明したように、本発明の中継装置によれば、２i（ｉ＝１，２，……ｎ）を単位とする数の入力ポート及び出力ポート間で波長周回性が満たされることになるため、収容可能な通信ノード数の上限値Ｎ（但し、Ｎ＝２n）より少ないＭ個の通信ノードを収容するネットワークを、連続した波長の光信号を用いて構成する場合に必要な波長の数が２iのうちＭ以上で最小の値となり、従来に比べて必要な波長数を削減することができる。
【図面の簡単な説明】
【図１】本発明の中継装置の実施の形態の一例を示す構成図
【図２】本発明の中継装置における入力ポート及び出力ポート間を結ぶ波長の関係を示す説明図
【図３】従来の中継装置の一例を示す構成図
【図４】従来の中継装置における入力ポート及び出力ポート間を結ぶ波長の関係を示す説明図
【符号の説明】
１０−１〜１０−８：通信ノードの送信機、２０−１〜２０−８：通信ノードの受信機、４０：中継装置、４１−１〜４１−８：入力ポート、４２−１〜４２−８：出力ポート、４３−１〜４３−８：波長分波装置、４４−１〜４４−８：波長合波装置、４５：光導波路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a repeater that constitutes an optical communication network using an optical wavelength division multiplexing (WDM) system.
[0002]
[Prior art]
When configuring an optical communication network based on an optical wavelength division multiplexing (WDM) system between a plurality of communication nodes having a transmitter that transmits an optical wavelength division multiplexed signal and a receiver that receives an optical wavelength division multiplexed signal, each communication node Must be connected to a repeater that can transmit the optical signals without congesting each other.
[0003]
FIG. 3 shows an example of a conventional repeater using a wavelength-circulating arrayed waveguide grating having N inputs and N outputs (here, 8 inputs and 8 outputs). In the figure, reference numerals 10-1 to 10-8 denote communication nodes. A transmitter, 20-1 to 20-8 are receivers of communication nodes, and 30 is a wavelength-circulating arrayed waveguide grating (relay device).
[0004]
The wavelength-circulating arrayed waveguide grating 30 has eight input ports 31-1 to 31-8 and eight output ports 32-1 to 32-8, and kth (k = 1, 2,...). 8) The k-th input port 31-k is connected to the transmitter 10-k of the k-th communication node by an optical transmission line such as an optical fiber, and the k-th output port 32-k is the k-th output port. The communication node receiver 20-k is connected by an optical transmission line such as an optical fiber.
[0005]
Wavelengths λ1 to λ8 (λ1 <λ2 <λ3 <λ4 <λ5 <λ6 <λ7 <λ8, or λ1>λ2>λ3>λ4>λ5>λ6>λ7> λ8 transmitted from the transmitter 10 by wavelength division multiplexing. ) Is input to the corresponding input port 31 of the wavelength-circulating
[0006]
FIG. 4 is a table showing the relationship of wavelengths connecting the input ports 31-1 to 31-8 and the output ports 32-1 to 32-8 of the wavelength-circulating arrayed waveguide grating 30. In particular, since the arrayed waveguide diffraction grating 30 has wavelength revolving characteristics, 8 × 8 input / outputs can be realized using eight types of wavelengths (see Patent Document 1).
[0007]
[Patent Document 1]
JP 2000-201112 A
[Problems to be solved by the invention]
However, when the above-described repeater using an N-input N-output wavelength-circulating arrayed waveguide grating is used, a network that accommodates M communication nodes that are fewer than N is configured using optical signals having continuous wavelengths. Then, the number of required wavelengths is the smaller of 2M-1 and N (for example, in order to connect four communication nodes using an 8-input 8-output wavelength-circulating arrayed waveguide grating) 7 wavelengths are required, and 13 wavelengths are required to connect 7 communication nodes using a 16-input 16-output wavelength-circulating arrayed waveguide grating.
[0009]
This is because, in the input / output characteristics of the wavelength-circulating arrayed waveguide grating, focusing on only a part of the input / output relationship, the wavelength-circulating property is not satisfied.
[0010]
Since the upper limit of the number of communication nodes that can be accommodated in the network is N, if a network is constructed using a repeater using a wavelength-circular arrayed waveguide diffraction grating having a large N in anticipation of future expandability, the initial number of communication nodes is small. Even at the time of introduction, an optical signal having a large number of wavelengths is required, and there is a problem that the feature of reducing the number of wavelengths used cannot be utilized.
[0011]
The present invention has been made in view of the above-mentioned conventional drawbacks, and is a network using optical signals of continuous wavelengths when the number of communication nodes actually accommodated is smaller than the upper limit value of the number of communication nodes that can be accommodated. It is an object of the present invention to provide a relay device that requires a small number of wavelengths to configure.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a relay that configures an optical communication network by connecting communication nodes including a transmitter that transmits an optical wavelength division multiplexed signal and a receiver that receives the optical wavelength division multiplexed signal. A device,
2 n (n is an arbitrary integer greater than or equal to 2 ) input ports respectively connected to the transmitter of the communication node via the optical transmission line, and connected to the receiver of the communication node via the
a and A are integers greater than or equal to 0 and less than or equal to n, b is an integer greater than or equal to 0 and less than 2 a-1 (provided that only b = 0 when a = 0), B is greater than or equal to 0 and 2 A-1 An integer less than (however, if A = 0, only B = 0), and the wavelength of the optical signal is represented by a serial number from 1,
An optical waveguide connecting the first wavelength demultiplexing device and the first wavelength multiplexing device includes an output end of the wavelength demultiplexing device that outputs an optical signal having a wavelength of No. 1 and an optical signal having the wavelength of the No. 1 It shall be connected to the input end of the wavelength multiplexer to be input,
An optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device is:
When a = A (except when a = A = 0), an optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device is used. It connects between the output end of the wavelength demultiplexing device that outputs an optical signal of the same number as the wavelength that passes through, and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a> A, the wavelength having a number obtained by adding 2 a-1 to the wavelength passing through the optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device It connects between the output end of the wavelength demultiplexing device that outputs an optical signal and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a <A, the wavelength of the number obtained by adding 2 A-1 to the wavelength passing through the optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device A relay device is proposed that connects between an output end of the wavelength demultiplexing device that outputs an optical signal and an input end of the wavelength multiplexing device that inputs an optical signal of the wavelength of the number.
[0013]
According to the above-described configuration, since the wavelength circulation property is satisfied between the number of input ports and output ports in units of 2 i (i = 1 , 2,... N), the number of communication nodes that can be accommodated. When a network accommodating M communication nodes smaller than the upper limit value N (where N = 2 n ) is configured using optical signals having continuous wavelengths, the number of wavelengths required is M or more of 2 i. The number of wavelengths required to connect four communication nodes using a relay device with the minimum value (for example, 8
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0015]
FIG. 1 shows an example of an embodiment of a relay apparatus according to the present invention, in which 10-1 to 10-8 are transmitters of communication nodes, 20-1 to 20-8 are receivers of communication nodes, Reference numeral 40 denotes a relay device of the present invention.
[0016]
The relay apparatus 40 has 2 n (n is an arbitrary integer equal to or greater than 2 ), here, 8 (n = 3) input ports 41-1 to 41-8 and 8 output ports 42-1 to 42. -8 and wavelength demultiplexing devices 43-1 to 43-8 that are provided corresponding to each input port and demultiplex an optical wavelength division multiplexed signal into optical signals for each wavelength, and provided corresponding to each output port Wavelength multiplexing devices 44-1 to 44-8 for multiplexing optical signals for each wavelength into optical wavelength division multiplexed signals, wavelength demultiplexing devices 43-1 to 43-8, and wavelength multiplexing devices 44-1 to 44-1. 44-8, and a plurality of
[0017]
Here, the
[0018]
That is, a and A are integers greater than or equal to 0 and less than or equal to n, b is an integer greater than or equal to 0 and less than 2 a-1 (provided that only b = 0 when a = 0), and B is greater than 0 and equal to 2 A When an integer less than -1 is used (however, if A = 0, only B = 0), and the wavelength of the optical signal is represented by a serial number from 1,
An optical waveguide connecting the first wavelength demultiplexing device and the first wavelength multiplexing device includes an output end of the wavelength demultiplexing device that outputs an optical signal having a wavelength of No. 1 and an optical signal having the wavelength of the No. 1 It shall be connected to the input end of the wavelength multiplexer to be input,
An optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device is:
When a = A (except when a = A = 0), an optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device is used. It connects between the output end of the wavelength demultiplexing device that outputs an optical signal of the same number as the wavelength that passes through, and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a> A, the wavelength having a number obtained by adding 2 a-1 to the wavelength passing through the optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device It connects between the output end of the wavelength demultiplexing device that outputs an optical signal and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a <A, the wavelength of the number obtained by adding 2 A-1 to the wavelength passing through the optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device It is set and arranged so as to connect between an output end of the wavelength demultiplexing device that outputs an optical signal and an input end of the wavelength multiplexing device that inputs an optical signal having the wavelength of the number.
[0019]
The setting process when n = 2 (4 inputs and 4 outputs) will be described below.
[0020]
First, the optical waveguide (a = 0, A = 0, b = 0, B = 0) connecting the first wavelength demultiplexing device 43-1 and the first wavelength multiplexing device 44-1 is the first wavelength. That is, the output terminal of the wavelength demultiplexing device 43-1 that outputs the optical signal having the wavelength λ1 is connected to the input terminal of the wavelength multiplexing device 44-1 that inputs the optical signal having the wavelength λ1.
[0021]
Next, when 1 is added to a (a = 1, A = 0, b = 0, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-2 and the wavelength multiplexing device 44-1 is 2 a-1 -b = 1 is a number obtained by adding 2 a-1 = 1 to the wavelength λ1 passing through the optical waveguide connecting the first wavelength demultiplexing device and 2 A -B = 1st wavelength multiplexing device, that is, the wavelength λ2 Is connected between the output end of the wavelength demultiplexing device 43-2 for outputting the optical signal and the input end of the wavelength multiplexing device 44-1 for inputting the optical signal of the wavelength λ2.
[0022]
When 1 is further added to a (a = 2, A = 0, b = 0, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-4 and the wavelength multiplexing device 44-1 is 2 a− 1− b = 2 is a number obtained by adding 2 a−1 = 2 to the wavelength λ2 passing through the optical waveguide connecting the second wavelength demultiplexing device and 2 A− B = first wavelength multiplexing device, that is, the light of wavelength λ4. The output end of the wavelength demultiplexing device 43-4 that outputs a signal is connected to the input end of the wavelength multiplexing device 44-1 that inputs an optical signal of the wavelength λ2.
[0023]
Further, when 1 is added to b (a = 2, A = 0, b = 1, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-3 and the wavelength multiplexing device 44-1 is 2 a−. 1− b = 1 is a number obtained by adding 2 a−1 = 2 to the wavelength λ1 passing through the optical waveguide connecting the first wavelength demultiplexing device and the 2 A− B = first wavelength multiplexing device, that is, the light of wavelength λ3. The output end of the wavelength demultiplexing device 43-3 that outputs a signal is connected to the input end of the wavelength multiplexing device 44-1 that inputs an optical signal of the wavelength λ2.
[0024]
Next, a and b are returned to 0, and 1 is added to A (a = 0, A = 1, b = 0, B = 0), the wavelength demultiplexing device 43-1 and the wavelength multiplexing device 44- an optical waveguide connecting the 2, 2 a -b = 1 th the wavelength λ1 passing through the optical waveguide connecting the wavelength demultiplexing device, and 2 a-1 -B = 1 th
[0025]
Further, when 1 is added to a (a = 1, A = 1, b = 0, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-2 and the wavelength multiplexing device 44-2 is 2 a−. 1 −b = 1 wavelength, and 2 A−1 −B = wavelength having the same number as the wavelength passing through the optical waveguide connecting the first wavelength multiplexing device, that is, the wavelength for outputting the optical signal of wavelength λ1 The output terminal of the wave device 43-2 is connected to the input terminal of the wavelength multiplexer 44-2 for inputting the optical signal having the wavelength λ1.
[0026]
When 1 is further added to a (a = 2, A = 1, b = 0, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-4 and the wavelength multiplexing device 44-2 is 2 a− 1− b = 2 is a number obtained by adding 2 a−1 = 2 to the wavelength λ1 passing through the optical waveguide connecting the second wavelength demultiplexing device and 2 A− B = second wavelength multiplexing device, that is, the light of wavelength λ3. The output end of the wavelength demultiplexing device 43-4 that outputs the signal is connected to the input end of the wavelength multiplexing device 44-2 that inputs the optical signal of the wavelength λ3.
[0027]
Further, when 1 is added to b (a = 2, A = 1, b = 1, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-3 and the wavelength multiplexing device 44-2 is 2 a−. 1− b = 1 is a number obtained by adding 2 a−1 = 2 to the wavelength λ2 passing through the optical waveguide connecting the first wavelength demultiplexing device and the 2 A− B = 2nd wavelength multiplexing device, that is, the light of wavelength λ4. The output end of the wavelength demultiplexing device 43-3 that outputs a signal is connected to the input end of the wavelength multiplexing device 44-2 that inputs an optical signal of the wavelength λ4.
[0028]
Next, a and b are returned to 0, and 1 is added to A (a = 0, A = 2, b = 0, B = 0), the wavelength demultiplexing device 43-1 and the
[0029]
Further, when 1 is added to a (a = 1, A = 2, b = 0, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-2 and the wavelength multiplexing device 44-4 is 2 a −. b = number obtained by adding 2 A-1 = 2 to the wavelength λ1 passing through the optical waveguide connecting the second wavelength demultiplexing device and 2 A-1 -B = second wavelength multiplexing device, that is, the light of wavelength λ3 The output end of the wavelength demultiplexing device 43-2 that outputs the signal is connected to the input end of the wavelength multiplexing device 44-4 that inputs the optical signal of the wavelength λ3.
[0030]
When 1 is further added to a (a = 2, A = 2, b = 0, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-4 and the wavelength multiplexing device 44-4 is 2 a− 1 −b = the wavelength having the same number as the wavelength passing through the optical waveguide connecting the second wavelength demultiplexing device and 2 A-1 −B = second wavelength multiplexing device, that is, the wavelength for outputting the optical signal having the wavelength λ1. The output terminal of the wave device 43-4 is connected to the input terminal of the wavelength multiplexer 44-4 for inputting the optical signal having the wavelength λ1.
[0031]
Further, when 1 is added to b (a = 2, A = 2, b = 1, B = 0), the optical waveguide connecting the wavelength demultiplexing device 43-3 and the wavelength multiplexing device 44-4 is 2 a−. 1 -b = wavelength of the same number as the wavelength passing through the optical waveguide connecting the first wavelength demultiplexing device and 2 A-1 -B = second wavelength multiplexing device, that is, the wavelength for outputting the optical signal of wavelength λ2 The output terminal of the wave device 43-3 is connected to the input terminal of the wavelength multiplexer 44-4 for inputting the optical signal having the wavelength λ2.
[0032]
Next, the wavelength demultiplexing device 43-1 and the
[0033]
Further, when 1 is added to a (a = 1, A = 2, b = 0, B = 1), the optical waveguide connecting the wavelength demultiplexing device 43-2 and the wavelength multiplexing device 44-3 is 2 a −. b = number obtained by adding 2 A-1 = 2 to the wavelength λ2 passing through the optical waveguide connecting the second wavelength demultiplexing device and the 2 A-1 -B = first wavelength multiplexing device, that is, the light of wavelength λ4 The output end of the wavelength demultiplexing device 43-2 that outputs a signal and the input end of the wavelength multiplexing device 44-3 that inputs an optical signal of the wavelength λ4 are connected.
[0034]
When 1 is further added to a (a = 2, A = 2, b = 0, B = 1), the optical waveguide connecting the wavelength demultiplexing device 43-4 and the wavelength multiplexing device 44-3 is 2 a− 1 −b = the wavelength of the same number as the wavelength passing through the optical waveguide connecting the second wavelength demultiplexing device and 2 A−1 -B = first wavelength multiplexing device, that is, the wavelength for outputting the optical signal of
[0035]
Further, when 1 is added to b (a = 2, A = 2, b = 1, B = 1), the optical waveguide connecting the wavelength demultiplexing device 43-3 and the wavelength multiplexing device 44-3 is 2 a−. 1 −b = 1 wavelength, and 2 A−1 −B = wavelength having the same number as the wavelength passing through the optical waveguide connecting the first wavelength multiplexing device, that is, the wavelength for outputting the optical signal of wavelength λ1 The output terminal of the wave device 43-3 is connected to the input terminal of the wavelength multiplexer 44-3 for inputting the optical signal having the wavelength λ1.
[0036]
FIG. 2 shows the wavelength relationship between the wavelength demultiplexing devices 43-1 to 43-8 and the wavelength multiplexing devices 44-1 to 44-8 connected by the
[0037]
The input ports 41-1 to 41-8 and the output ports 42-1 to 42-8 of the relay device 40 are the k-th (k = 1, 2,... 8) -th input port 41-k as in the conventional case. Are connected to the transmitter 10-k of the kth communication node by an optical transmission line such as an optical fiber, and the kth output port 42-k is connected to the receiver 20-k of the kth communication node. They are connected by an optical transmission line such as an optical fiber.
[0038]
The optical wavelength division multiplexed signals of wavelengths λ1 to λ8 sent from the transmitter 10-k of the kth communication node via the optical transmission line are input to the corresponding input port 41-k of the relay device 40, The signal is input to the wavelength demultiplexer 43-k and demultiplexed. The demultiplexed optical signal is input to any of the wavelength multiplexing devices 44-1 to 44-8 via the
[0039]
On the other hand, the k-th wavelength multiplexing device 44-k multiplexes optical signals of wavelengths λ1 to λ8 respectively input from any of the wavelength demultiplexing devices 43-1 to 43-8, and performs optical wavelength division multiplexing. Generate a signal. The optical wavelength division multiplexed signal generated by the wavelength multiplexing device 44-k is output from the corresponding output port 42-k of the relay device 40 and sent to the receiver 20-k of the communication node via the optical transmission line. It is done.
[0040]
As can be seen from FIG. 2, in the relay device 40 described above, the wavelength circulation property is satisfied between the number of input ports and output ports in units of 2 i (i = 1 , 2, 3, 4). Therefore, the connection between the eight communication nodes can be realized using eight wavelengths from λ1 to λ8, and the connection between the four communication nodes can be performed at four wavelengths from λ1 to λ4 (from the first to the fourth). 4 wavelengths (from 1st to 4th input port and 5th to 8th) or from λ5 to λ8) Output ports, or 5th to 8th input ports and 1st to 4th output ports), and connection between two or less communication nodes , 2 of λ2 The wavelength or [lambda] 3, .lambda.4 two wavelengths or [lambda] 5, two wavelengths or λ7 of .lambda.6, the equally realized using two wavelengths of .lambda.8.
[0041]
An arrayed waveguide diffraction grating can be used as the wavelength demultiplexing device and wavelength multiplexing device in the above-described repeater, and an optical fiber can be used as the optical waveguide. In the above-described embodiment, the number of input ports and output ports is 8 (n = 3). However, the present invention is not limited to this.
[0042]
【The invention's effect】
As described above, according to the relay apparatus of the present invention, the wavelength circulatory property is satisfied between the number of input ports and output ports in units of 2 i (i = 1 , 2,... N). Therefore, the number of wavelengths required when a network accommodating M communication nodes smaller than the upper limit value N (where N = 2 n ) of the number of communication nodes that can be accommodated is configured using optical signals having continuous wavelengths. The number is minimum when the number is 2 i or more, and the required number of wavelengths can be reduced as compared with the prior art.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of an embodiment of a relay apparatus of the present invention. FIG. 2 is an explanatory diagram showing a relationship between wavelengths connecting an input port and an output port in the relay apparatus of the present invention. FIG. 4 is a block diagram showing an example of a relay device. FIG. 4 is an explanatory diagram showing the relationship of wavelengths connecting input ports and output ports in a conventional relay device.
10-1 to 10-8: transmitter of communication node, 20-1 to 20-8: receiver of communication node, 40: relay device, 41-1 to 41-8: input port, 42-1 to 42- 8: output port, 43-1 to 43-8: wavelength demultiplexing device, 44-1 to 44-8: wavelength multiplexing device, 45: optical waveguide.
Claims (2)
光伝送路を介して通信ノードの送信機にそれぞれ接続される２n（ｎは２以上の任意の整数）個の入力ポートと、光伝送路を介して通信ノードの受信機にそれぞれ接続される２n個の出力ポートと、各入力ポートに対応して設けられ、前記送信機からの光波長分割多重信号を波長毎の光信号に分波する波長分波装置と、各出力ポートに対応して設けられ、波長毎の光信号を光波長分割多重信号に合波して前記受信機に送出する波長合波装置と、波長分波装置と波長合波装置との間を接続する複数の光導波路とからなり、
ａ，Ａは０以上でｎ以下の整数、ｂは０以上で２a-1未満の整数（但し、ａ＝０の場合はｂ＝０のみとする）、Ｂは０以上で２A-1未満の整数（但し、Ａ＝０の場合はＢ＝０のみとする）とし、光信号の波長を１からの連番で表すものとする時、
１番目の波長分波装置及び１番目の波長合波装置を結ぶ光導波路は、番号１の波長の光信号を出力する前記波長分波装置の出力端と、当該番号１の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
２a−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路は、
ａ＝Ａの時（但し、ａ＝Ａ＝０の場合は除く）は、２a-1−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＞Ａの時は、２a-1−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２a-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＜Ａの時は、２a−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２A-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとした
ことを特徴とする中継装置。A relay device that configures an optical communication network by connecting between communication nodes including a transmitter that transmits an optical wavelength division multiplexed signal and a receiver that receives an optical wavelength division multiplexed signal,
2 n (n is an arbitrary integer greater than or equal to 2 ) input ports respectively connected to the transmitter of the communication node via the optical transmission line, and connected to the receiver of the communication node via the optical transmission line 2 n output ports, a wavelength demultiplexer provided corresponding to each input port and demultiplexing the optical wavelength division multiplexed signal from the transmitter into optical signals for each wavelength, and corresponding to each output port A wavelength multiplexing device that multiplexes an optical signal for each wavelength into an optical wavelength division multiplexed signal and sends it to the receiver, and a plurality of optical devices that connect between the wavelength demultiplexing device and the wavelength multiplexing device Consisting of a waveguide,
a and A are integers greater than or equal to 0 and less than or equal to n, b is an integer greater than or equal to 0 and less than 2 a-1 (provided that only b = 0 when a = 0), B is greater than or equal to 0 and 2 A-1 An integer less than (however, if A = 0, only B = 0), and the wavelength of the optical signal is represented by a serial number from 1,
An optical waveguide connecting the first wavelength demultiplexing device and the first wavelength multiplexing device includes an output end of the wavelength demultiplexing device that outputs an optical signal having a wavelength of No. 1 and an optical signal having the wavelength of the No. 1 It shall be connected to the input end of the wavelength multiplexer to be input,
An optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device is:
When a = A (except when a = A = 0), an optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device is used. It connects between the output end of the wavelength demultiplexing device that outputs an optical signal of the same number as the wavelength that passes through, and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a> A, the wavelength having a number obtained by adding 2 a-1 to the wavelength passing through the optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device It connects between the output end of the wavelength demultiplexing device that outputs an optical signal and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a <A, the wavelength of the number obtained by adding 2 A-1 to the wavelength passing through the optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device A relay apparatus characterized in that it connects between an output end of the wavelength demultiplexing apparatus that outputs an optical signal and an input end of the wavelength multiplexing apparatus that inputs an optical signal of the wavelength of the number.
ａ，Ａは０以上でｎ以下の整数、ｂは０以上で２a-1未満の整数（但し、ａ＝０の場合はｂ＝０のみとする）、Ｂは０以上で２A-1未満の整数（但し、Ａ＝０の場合はＢ＝０のみとする）とし、光信号の波長を１からの連番で表すものとする時、
１番目の波長分波装置及び１番目の波長合波装置を結ぶ光導波路は、番号１の波長の光信号を出力する前記波長分波装置の出力端と、当該番号１の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
２a−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路は、
ａ＝Ａの時（但し、ａ＝Ａ＝０の場合は除く）は、２a-1−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長と同じ番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＞Ａの時は、２a-1−ｂ番目の波長分波装置及び２A−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２a-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとし、
ａ＜Ａの時は、２a−ｂ番目の波長分波装置及び２A-1−Ｂ番目の波長合波装置を結ぶ光導波路を通る波長に対し２A-1を加えた番号の波長の光信号を出力する前記波長分波装置の出力端と、当該番号の波長の光信号を入力する前記波長合波装置の入力端との間を結ぶものとする
ことを特徴とする中継装置における光導波路の設定方法。2 n (n is an arbitrary integer greater than or equal to 2 ) input ports, 2 n output ports, and corresponding to each input port are provided, and an optical wavelength division multiplexed signal is demultiplexed into optical signals for each wavelength. A wavelength demultiplexer, a wavelength demultiplexer provided corresponding to each output port, for multiplexing and transmitting an optical signal for each wavelength into an optical wavelength division multiplexed signal, and a wavelength demultiplexer and a wavelength demultiplexer It is a setting method of an optical waveguide in a relay device comprising a plurality of optical waveguides connecting between,
a and A are integers greater than or equal to 0 and less than or equal to n, b is an integer greater than or equal to 0 and less than 2 a-1 (provided that only b = 0 when a = 0), B is greater than or equal to 0 and 2 A-1 An integer less than (however, if A = 0, only B = 0), and the wavelength of the optical signal is represented by a serial number from 1,
An optical waveguide connecting the first wavelength demultiplexing device and the first wavelength multiplexing device includes an output end of the wavelength demultiplexing device that outputs an optical signal having a wavelength of No. 1 and an optical signal having the wavelength of the No. 1 It shall be connected to the input end of the wavelength multiplexer to be input,
An optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device is:
When a = A (except when a = A = 0), an optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device is used. It connects between the output end of the wavelength demultiplexing device that outputs an optical signal of the same number as the wavelength that passes through, and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a> A, the wavelength having a number obtained by adding 2 a-1 to the wavelength passing through the optical waveguide connecting the 2 a-1 -b th wavelength demultiplexing device and the 2 A -B th wavelength multiplexing device It connects between the output end of the wavelength demultiplexing device that outputs an optical signal and the input end of the wavelength multiplexing device that inputs the optical signal of the wavelength of the number,
When a <A, the wavelength of the number obtained by adding 2 A-1 to the wavelength passing through the optical waveguide connecting the 2 a -b th wavelength demultiplexing device and the 2 A-1 -B th wavelength multiplexing device The optical fiber in the repeater is characterized in that it connects between an output end of the wavelength demultiplexing device that outputs an optical signal and an input end of the wavelength multiplexing device that inputs an optical signal of the wavelength of the number. Waveguide setting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003009392A JP3984171B2 (en) | 2003-01-17 | 2003-01-17 | Relay device and setting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003009392A JP3984171B2 (en) | 2003-01-17 | 2003-01-17 | Relay device and setting method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004222127A JP2004222127A (en) | 2004-08-05 |
| JP3984171B2 true JP3984171B2 (en) | 2007-10-03 |
Family
ID=32898903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003009392A Expired - Fee Related JP3984171B2 (en) | 2003-01-17 | 2003-01-17 | Relay device and setting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3984171B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964829A (en) * | 2017-05-22 | 2018-12-07 | 中兴通讯股份有限公司 | A kind of trunking |
-
2003
- 2003-01-17 JP JP2003009392A patent/JP3984171B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004222127A (en) | 2004-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH04167634A (en) | Optical wavelength multiplex add/drop device and optical wavelength multiplex network | |
| JP3993580B2 (en) | Wavelength division multiplexing self-healing bidirectional ring network | |
| US20030206743A1 (en) | Cross connecting device and optical communication system | |
| JP2002152784A (en) | Optical cross connect device | |
| EP1116346B1 (en) | Tuneable add/drop multiplexer | |
| JP3984171B2 (en) | Relay device and setting method thereof | |
| JP3480544B2 (en) | WDM communication system and method | |
| JP2004135331A (en) | Optical cross-connect system | |
| US7133614B2 (en) | Optical multiple transmission method, optical network and optical transmission apparatus | |
| JP2000224108A (en) | Wavelength division multiplexer demltiplexer | |
| JP3614320B2 (en) | Wavelength multiple polymerization demultiplexing transmission system and wavelength division multiplexing transmission apparatus | |
| JP3055603B2 (en) | Optical network | |
| JP3703018B2 (en) | Star optical network | |
| JP3889721B2 (en) | Optical wavelength division multiplexing network equipment | |
| JPH04104634A (en) | Wavelength multiplex optical network | |
| JP4553236B2 (en) | Optical communication method and optical transmission apparatus | |
| JP3566593B2 (en) | WDM network | |
| JP3895295B2 (en) | Optical wavelength division multiplexing network equipment | |
| JP2000206362A (en) | OPTICAL ADM(Add/Drop Multiplexing) NODE DEVICE | |
| JP3616991B2 (en) | Optical communication network | |
| JP4476200B2 (en) | Optical signal transmitter / receiver, optical signal multiplexer / demultiplexer, and optical communication network | |
| JP2005117509A (en) | Optical communication network system and its wavelength routing device | |
| JP4233973B2 (en) | Optical communication network system | |
| JPH10303984A (en) | Optical switching device and optical network system | |
| JP4755126B2 (en) | Wavelength routing network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050131 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20061220 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070123 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070309 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20070703 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20070705 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100713 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 3984171 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100713 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110713 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120713 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130713 Year of fee payment: 6 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |