JP2004500722A5 - - Google Patents

Download PDF

Info

Publication number
JP2004500722A5
JP2004500722A5 JP2000506740A JP2000506740A JP2004500722A5 JP 2004500722 A5 JP2004500722 A5 JP 2004500722A5 JP 2000506740 A JP2000506740 A JP 2000506740A JP 2000506740 A JP2000506740 A JP 2000506740A JP 2004500722 A5 JP2004500722 A5 JP 2004500722A5
Authority
JP
Japan
Prior art keywords
polarization
optical
wavelength
beams
control state
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.)
Pending
Application number
JP2000506740A
Other languages
Japanese (ja)
Other versions
JP2004500722A (en
Filing date
Publication date
Priority claimed from US08/907,551 external-priority patent/US6005697A/en
Application filed filed Critical
Priority claimed from PCT/US1998/015618 external-priority patent/WO1999008403A1/en
Publication of JP2004500722A publication Critical patent/JP2004500722A/en
Publication of JP2004500722A5 publication Critical patent/JP2004500722A5/ja
Pending legal-status Critical Current

Links

Images

Claims (32)

ＷＤＭ信号を搬送する光ファイバの２つのアレイ間の光チャネルの波長ルーチングを提供する光波長スイッチの相互接続アレイを有する光クロスコネクト・ネットワークにおける、
（ａ）ＷＤＭ信号を伝える入力ポートと、
（ｂ）前記ＷＤＭ信号の第１及び第２スペクトル帯を伝える２つの出力ポートと、
（ｃ）前記入力ＷＤＭ信号を、直交偏光を有し空間的に分離された第１ビームと第２ビームとに分解する偏光分離素子と、
（ｄ）前記第１ビームの偏光を前記第２ビームの偏光とほぼ一致するように回転させる第１制御状態と、前記第２ビームの偏光を前記第１ビームの偏光とほぼ一致するように回転させる第２制御状態とを有する第１偏光回転子であって、前記第１偏光回転子の前記制御状態が外部制御信号によって切換可能である第１偏光回転子と、
（ｅ）前記第１偏光回転子から前記第１及び第２ビームを受信するよう結合された波長フィルタであって、前記波長フィルタが、前記第１ビームが偏光が互いに直交している第３及び第４ビームに分解され、前記第２ビームが偏光が互いに直交している第５及び第６ビームに分解されるような偏光依存光伝送機能を有し、その際前記第３及び第５ビームが第１偏光の第１スペクトル帯を搬送し、前記第４及び第６ビームが第２偏光の第２スペクトル帯を搬送し、かつその際前記第１及び第２スペクトル帯がほぼ相補的であり前記第１及び第２偏光が直交する波長フィルタと、
（ｆ）前記第３、第４、第５及び第６ビームを２対の直交偏光ビームに空間的に分離する偏光依存ルーチング素子と、
（ｇ）前記第３及び第５ビームが直交偏光となり前記第４及び第６ビームが直交偏光となるように、前記第３、第４、第５及び第６ビームを回転させる第２偏光回転子と、
（ｈ）前記第２偏光回転子から前記第３、第４、第５及び第６ビームを受信し、第１偏光回転子の前記制御状態に基づいて前記出力ポートの一方で前記第１スペクトル帯を含む前記第３及び第５ビームを空間的に再結合し、前記出力ポートのもう一方で前記第２スペクトル帯を含む前記第４及び第６ビームを空間的に再結合する偏光結合素子とを有する１×２光波長スイッチと、
前記第１偏光回転子の前記制御状態を制御する制御手段とを備える改善点。In an optical cross-connect network having an interconnected array of optical wavelength switches that provides wavelength routing of an optical channel between two arrays of optical fibers carrying WDM signals
(A) an input port for transmitting a WDM signal;
(B) two output ports carrying the first and second spectral bands of the WDM signal;
(C) a polarization separation element that decomposes the input WDM signal into a first beam and a second beam that have orthogonal polarization and are spatially separated;
(D) a first control state in which the polarization of the first beam is rotated to substantially match the polarization of the second beam, and the polarization of the second beam is rotated to approximately match the polarization of the first beam. A first polarization rotator having a second control state, wherein the control state of the first polarization rotator is switchable by an external control signal;
(E) a wavelength filter coupled to receive the first and second beams from the first polarization rotator, wherein the wavelength filter has third and third polarizations in which the first beam has a polarization orthogonal to each other; It has a polarization-dependent optical transmission function that is decomposed into a fourth beam, and the second beam is decomposed into fifth and sixth beams whose polarizations are orthogonal to each other, wherein the third and fifth beams are Carrying a first spectral band of a first polarization, wherein the fourth and sixth beams carry a second spectral band of a second polarization, wherein the first and second spectral bands are substantially complementary, and A wavelength filter in which the first and second polarizations are orthogonal;
(F) a polarization dependent routing element that spatially separates the third, fourth, fifth and sixth beams into two pairs of orthogonally polarized beams;
(G) a second polarization rotator that rotates the third, fourth, fifth, and sixth beams such that the third and fifth beams are orthogonally polarized and the fourth and sixth beams are orthogonally polarized; When,
(H) receiving the third, fourth, fifth and sixth beams from the second polarization rotator, and the first spectral band on one of the output ports based on the control state of the first polarization rotator A polarization coupling element that spatially recombines the third and fifth beams including and spatially recombines the fourth and sixth beams including the second spectral band on the other side of the output port; A 1 × 2 optical wavelength switch,
And a control means for controlling the control state of the first polarization rotator. 前記第１偏光回転子がさらに、
前記第１制御状態で前記第１ビームの偏光を回転させ、前記第２制御状態で前記第１ビームを回転せずに通過させる第１領域と、
前記第１制御状態で前記第２ビームを回転せずに通過させ、前記第２制御状態で前記第２ビームの偏光を回転させる第２領域とを備える、請求項１に記載の光クロスコネクト・ネットワーク。The first polarization rotator further comprises:
A first region that rotates polarization of the first beam in the first control state and allows the first beam to pass through without rotation in the second control state;
2. The optical cross-connect of claim 1, further comprising: a second region that passes the second beam without rotation in the first control state and rotates a polarization of the second beam in the second control state. network. 第２偏光回転子がさらに、
前記第５ビームの偏光を回転させる第１領域と、
前記第６ビームの偏光を回転させる第２領域と、
前記第３ビームを回転せずに通過させる第３領域と、
前記第４ビームを回転せずに通過させる第４領域とを備える、請求項１に記載の光クロスコネクト・ネットワーク。A second polarization rotator
A first region for rotating the polarization of the fifth beam;
A second region for rotating the polarization of the sixth beam;
A third region through which the third beam passes without rotation;
The optical cross-connect network according to claim 1, further comprising: a fourth region that allows the fourth beam to pass through without rotating. 前記波長フィルタが、各波長板が所定の方向を向いた積層された複数の複屈折波長板を備える、請求項１に記載の光クロスコネクト・ネットワーク。The optical cross-connect network according to claim 1, wherein the wavelength filter includes a plurality of birefringent wavelength plates stacked such that each wavelength plate faces a predetermined direction. 光波長スイッチの前記アレイが、複数の前記１×２光波長スイッチから製作された１×Ｎ光波長スイッチを備える、請求項１に記載の光クロスコネクト・ネットワーク。The optical cross-connect network of claim 1, wherein the array of optical wavelength switches comprises a 1 × N optical wavelength switch fabricated from a plurality of the 1 × 2 optical wavelength switches. 光波長スイッチの前記アレイが、
前記ＷＤＭ信号を２つのスペクトル帯に分割する第１の１×２光波長スイッチと、
前記第１の１×２光波長スイッチからの前記２つのスペクトル帯を４つのチャネルに分割する並列の第２及び第３の１×２光波長スイッチとを各々有する１×４光波長スイッチを備える、請求項１に記載の光クロスコネクト・ネットワーク。The array of optical wavelength switches is
A first 1 × 2 optical wavelength switch that divides the WDM signal into two spectral bands;
A 1 × 4 optical wavelength switch, each having a parallel second and third 1 × 2 optical wavelength switch that divides the two spectral bands from the first 1 × 2 optical wavelength switch into four channels; The optical cross-connect network according to claim 1. 前記１×４光波長スイッチがさらに、The 1 × 4 optical wavelength switch further includes:
前記４つの光チャネルの選択された第１及び第２のものに接続される第１の２×２光スイッチであって、前記第１の２×２光スイッチが前記制御手段の制御の元で前記第１及び第２光チャネルの順序を切換可能なように逆転させる第１の２×２光スイッチと、A first 2 × 2 optical switch connected to a selected first and second one of the four optical channels, wherein the first 2 × 2 optical switch is under the control of the control means; A first 2 × 2 optical switch for reversibly reversing the order of the first and second optical channels;
前記４つの光チャネルの選択された第３及び第４のものに接続される第２の２×２光スイッチであって、前記第２の２×２光スイッチが前記制御手段の制御の元で前記第３及び第４光チャネルの順序を切換可能なように逆転させる第２の２×２光スイッチとを備える、請求項６に記載の光クロスコネクト・ネットワーク。A second 2 × 2 optical switch connected to a selected third and fourth of the four optical channels, wherein the second 2 × 2 optical switch is under the control of the control means; The optical cross-connect network according to claim 6, further comprising: a second 2 × 2 optical switch that reversely switches the order of the third and fourth optical channels. 前記光波長スイッチが、The optical wavelength switch is
入力ＷＤＭ信号をドロップ・チャネルの所定の集合と通過チャネルの残りの集合とに分割する第１の１×２光波長スイッチと、A first 1 × 2 optical wavelength switch that splits the input WDM signal into a predetermined set of drop channels and a remaining set of pass channels;
出力ＷＤＭ信号を生成するために、前記通過チャネルをアド・チャネルの所定の集合と結合する第２の１×２光波長スイッチとを備える、請求項１に記載の光クロスコネクト・ネットワーク。The optical cross-connect network of claim 1, comprising a second 1x2 optical wavelength switch that couples the transit channel with a predetermined set of add channels to generate an output WDM signal. さらに、前記ドロップ・チャネルをドロップ・チャネルの所定の第１集合とドロップ・チャネルの残りの第２集合とに分割する第３の１×２光波長スイッチを備える、請求項８に記載の光クロスコネクト・ネットワーク。9. The optical cross of claim 8, further comprising a third 1x2 optical wavelength switch that divides the drop channel into a predetermined first set of drop channels and a remaining second set of drop channels. Connect network. さらに、前記第２の１×２光波長スイッチについて前記アド・チャネルを生成するために、アド・チャネルの第１集合とアド・チャネルの第２の残りの集合を結合する第３の１×２光波長スイッチを備える、請求項８に記載の光クロスコネクト・ネットワーク。Further, a third 1 × 2 that combines the first set of add channels and the second remaining set of add channels to generate the add channel for the second 1 × 2 optical wavelength switch. The optical cross-connect network of claim 8, comprising an optical wavelength switch. 前記波長フィルタが、前記偏光依存光伝送機能を提供する積層された複数の複屈折波長板を有する、請求項１に記載の光クロスコネクト・ネットワーク。The optical cross-connect network of claim 1, wherein the wavelength filter comprises a plurality of stacked birefringent wave plates that provide the polarization-dependent optical transmission function. 前記積層された複数の複屈折波長板が、方解石、金紅石、ニオブ酸リチウム、及びＹＶＯThe plurality of laminated birefringent waveplates include calcite, gold pyroxene, lithium niobate, and YVO. ４4 ベースの結晶からなる材料のグループから選択される、請求項１１に記載の光クロスコネクト・ネットワーク。12. The optical cross-connect network according to claim 11, selected from the group of materials consisting of a base crystal. ＷＤＭ信号を搬送する光ファイバの２つのアレイ間の光チャネルの波長ルーチングを提供する光波長スイッチの相互接続アレイを有する光クロスコネクト・ネットワークにおける、
（ａ）ＷＤＭ信号を伝える入力ポートと、
（ｂ）前記ＷＤＭ信号の第１及び第２スペクトル帯を伝える２つの出力ポートと、
（ｃ）前記入力ＷＤＭ信号を、直交偏光を有し空間的に分離された第１ビームと第２ビームとに分解する偏光分離素子と、
（ｄ）前記第１ビームの偏光を前記第２ビームの偏光とほぼ一致するように回転させる第１状態と、前記第２ビームの偏光を前記第１ビームの偏光とほぼ一致するように回転させる第２状態とを有する第１偏光回転子であって、前記第１偏光回転子の前記制御状態が外部制御信号によって切換可能である第１偏光回転子と、
（ｅ）前記第１偏光回転子から前記第１及び第２ビームを受信するよう結合された第１波長フィルタであって、前記第１波長フィルタが、前記第１ビームが偏光が互いに直交している第３及び第４ビームに分解され、前記第２ビームが偏光が互いに直交している第５及び第６ビームに分解されるような偏光依存光伝送機能を有し、その際前記第３及び第５ビームが第１偏光の第１スペクトル帯を搬送し、前記第４及び第６ビームが第２偏光の第２スペクトル帯を搬送し、かつその際前記第１及び第２スペクトル帯がほぼ相補的であり前記第１及び第２偏光が直交する第１波長フィルタと、
（ｆ）前記第３、第４、第５及び第６ビームを２対の直交偏光ビームに空間的に分離する偏光依存ルーチング素子と、
（ｇ）前記第１波長フィルタとほぼ同じ伝送機能を有する第１波長フィルタであって、前記第２波長フィルタが前記偏光依存ルーチング素子を出る前記第３、第４、第５及び第６ビームを回転させて、前記第１波長フィルタに入る前の前記第２ビームと同じ偏光状態に戻す第２波長フィルタと、
（ｈ）前記第３及び第５ビームが直交偏光となり前記第４及び第６ビームが直交偏光となるように、前記第１偏光回転子の前記制御状態によって前記第２波長フィルタを出る前記第３、第４、第５及び第６ビームの偏光を回転させる第２偏光回転子と、
（ｉ）前記第２偏光回転子から前記第３、第４、第５及び第６ビームを受信し、第１偏光回転子の前記制御状態に基づいて前記出力ポートの一方で前記第１スペクトル帯を含む前記第３及び第５ビームを空間的に再結合し、前記出力ポートのもう一方で前記第２スペクトル帯を含む前記第４及び第６ビームを空間的に再結合する偏光結合素子とを有する１×２光波長スイッチと、
前記第１偏光回転子と前記第２偏光回転子との前記制御状態を制御する制御手段とを備える改善点。In an optical cross-connect network having an interconnected array of optical wavelength switches that provides wavelength routing of an optical channel between two arrays of optical fibers carrying WDM signals
(A) an input port for transmitting a WDM signal;
(B) two output ports carrying the first and second spectral bands of the WDM signal;
(C) a polarization separation element that decomposes the input WDM signal into a first beam and a second beam that have orthogonal polarization and are spatially separated;
(D) A first state in which the polarization of the first beam is rotated so as to substantially match the polarization of the second beam, and a polarization of the second beam is rotated so as to substantially match the polarization of the first beam. A first polarization rotator having a second state, wherein the control state of the first polarization rotator is switchable by an external control signal;
(E) a first wavelength filter coupled to receive the first and second beams from the first polarization rotator, wherein the first wavelength filter is configured such that the first beam is orthogonally polarized; Having a polarization-dependent optical transmission function such that the second beam is decomposed into fifth and sixth beams whose polarizations are orthogonal to each other. The fifth beam carries the first spectral band of the first polarization, the fourth and sixth beams carry the second spectral band of the second polarization, and the first and second spectral bands are substantially complementary. A first wavelength filter in which the first and second polarizations are orthogonal;
(F) a polarization dependent routing element that spatially separates the third, fourth, fifth and sixth beams into two pairs of orthogonally polarized beams;
(G) a first wavelength filter having substantially the same transmission function as the first wavelength filter, wherein the second wavelength filter passes the third, fourth, fifth and sixth beams exiting the polarization dependent routing element; A second wavelength filter that rotates to return to the same polarization state as the second beam before entering the first wavelength filter;
(H) The third wavelength exiting the second wavelength filter according to the control state of the first polarization rotator so that the third and fifth beams are orthogonally polarized and the fourth and sixth beams are orthogonally polarized. A second polarization rotator for rotating the polarization of the fourth, fifth and sixth beams;
(I) receiving said third, fourth, fifth and sixth beams from said second polarization rotator and said first spectral band at one of said output ports based on said control state of said first polarization rotator A polarization coupling element that spatially recombines the third and fifth beams including and spatially recombines the fourth and sixth beams including the second spectral band on the other side of the output port; A 1 × 2 optical wavelength switch,
An improvement point comprising a control means for controlling the control state of the first polarization rotator and the second polarization rotator. 前記第１偏光回転子がさらに、
前記第１制御状態で前記第１ビームの偏光を回転させ、前記第２制御状態で前記第１ビームを回転せずに通過させる第１領域と、
前記第１制御状態で前記第２ビームを回転せずに通過させ、前記第２制御状態で前記第２ビームの偏光を回転させる第２領域とを備える、請求項１３に記載の光クロスコネクト・ネットワーク。The first polarization rotator further comprises:
A first region that rotates polarization of the first beam in the first control state and allows the first beam to pass through without rotation in the second control state;
The optical cross-connect according to claim 13 , further comprising: a second region that allows the second beam to pass without rotation in the first control state and rotates polarization of the second beam in the second control state. network. 前記第２偏光回転子がさらに、
前記第５ビームの偏光を回転させる第１領域と、
前記第６ビームの偏光を回転させる第２領域と、
前記第３ビームを回転せずに通過させる第３領域と、
前記第４ビームを回転せずに通過させる第４領域とを備える、請求項１３に記載の光クロスコネクト・ネットワーク。The second polarization rotator further comprises:
A first region for rotating the polarization of the fifth beam;
A second region for rotating the polarization of the sixth beam;
A third region through which the third beam passes without rotation;
The optical cross-connect network according to claim 13 , further comprising a fourth region that allows the fourth beam to pass through without rotation. 前記第１波長フィルタが、各波長板が所定の方向を向いた積層された複数の複屈折波長板を備える、請求項１３に記載の光クロスコネクト・ネットワーク。The optical cross-connect network according to claim 13 , wherein the first wavelength filter includes a plurality of birefringent wave plates stacked with each wave plate facing a predetermined direction. 前記第２波長フィルタが、各波長板が所定の方向を向いた積層された複数の複屈折波長板を備える、請求項１３に記載の光クロスコネクト・ネットワーク。The optical cross-connect network according to claim 13 , wherein the second wavelength filter includes a plurality of birefringent wave plates stacked with each wave plate facing a predetermined direction. 前記第１波長フィルタが前記偏光依存光伝送機能を提供する積層された複数の複屈折波長板を有し、前記第２波長フィルタが、前記第１波The first wavelength filter has a plurality of stacked birefringent wavelength plates that provide the polarization-dependent light transmission function, and the second wavelength filter includes the first wave filter. 長フィルタの前記積層された複数の複屈折波長板とほぼ同じ前記伝送機能を提供する積層された複数の複屈折波長板を有する、請求項１３に記載の光クロスコネクト・ネットワーク。14. The optical cross-connect network of claim 13, comprising a plurality of stacked birefringent wave plates that provide substantially the same transmission function as the stacked birefringent wave plates of a long filter. 前記第１波長フィルタの前記積層された複数の複屈折波長板が、方解石、金紅石、ニオブ酸リチウム、及びＹＶＯThe plurality of laminated birefringent wave plates of the first wavelength filter are calcite, gold fluorite, lithium niobate, and YVO. ４4 ベースの結晶からなる材料のグループから選択される、請求項１８に記載の光クロスコネクト・ネットワーク。The optical cross-connect network of claim 18 selected from the group of materials consisting of a base crystal. 前記第２波長フィルタの前記積層された複数の複屈折波長板が、方解石、金紅石、ニオブ酸リチウム、及びＹＶＯThe plurality of laminated birefringent wave plates of the second wavelength filter are calcite, gold fluorite, lithium niobate, and YVO. ４4 ベースの結晶からなる材料のグループから選択される、請求項１８に記載の光クロスコネクト・ネットワーク。The optical cross-connect network of claim 18 selected from the group of materials consisting of a base crystal. Ｎ個の光チャネルを有するＷＤＭ光信号を搬送する光ファイバの第１アレイと第２アレイを相互接続する光クロスコネクト・ネットワークであって、前記光クロスコネクト・ネットワークが、
前記光チャネルの各々について光ファイバの前記第１アレイの１つと通信する入力ポートとＮ個の出力ポートの間の波長ルーチングを各々提供する１×Ｎ波長スイッチの第１アレイであって、前記１×Ｎ波長スイッチが、異なった順列の光チャネルを前記出力ポートに選択的にルーチングする複数の制御状態を有する１×Ｎ波長スイッチの第１アレイと、
前記光チャネルの各々について光ファイバの前記第２アレイの１つと通信する入力ポートとＮ個の出力ポートの間の波長ルーチングを各々提供する１×Ｎ波長スイッチの第２アレイであって、前記１×Ｎ波長スイッチが、異なった順列の光チャネルを前記出力ポートに選択的にルーチングする複数の制御状態を有する１×Ｎ波長スイッチの第２アレイと、
１×Ｎ波長スイッチの前記第１アレイの前記出力ポートと１×Ｎ波長スイッチの前記第２アレイの前記出力ポートとの間の光通信を提供する相互接続手段と、
光ファイバの前記第１及び第２アレイ間の望ましい相互接続を提供するために、１×Ｎ波長スイッチの前記第１及び第２アレイの前記制御状態を選択する制御手段とを備え、
その際前記１×Ｎ波長スイッチが、
（ａ）入力ＷＤＭ信号を、直交偏光を有し空間的に分離された第１ビームと第２ビームに分解する偏光分離素子と、
（ｂ）前記第１ビームの偏光を前記第２ビームの偏光とほぼ一致するように回転させる第１制御状態と、前記第２ビームの偏光を前記第１ビームの偏光とほぼ一致するように回転させる第２制御状態とを有する第１偏光回転子であって、前記第１偏光回転子の前記制御状態が前記制御手段によって切換可能である第１偏光回転子と、
（ｃ）前記第１偏光回転子から前記第１及び第２ビームを受信するよう結合された波長フィルタであって、前記波長フィルタが、前記第１ビームが偏光が互いに直交している第３及び第４ビームに分解され、前記第２ビームが偏光が互いに直交している第５及び第６ビームに分解されるような偏光依存光伝送機能を有し、前記第３及び第５ビームが第１偏光の第１スペクトル帯を搬送し、前記第４及び第６ビームが第２偏光の第２スペクトル帯を搬送し、その際前記第１及び第２スペクトル帯がほぼ相補的であり前記第１及び第２偏光が直交する波長フィルタと、
（ｄ）前記第３、第４、第５及び第６ビームを２対の直交偏光ビームに空間的に分離する偏光依存ルーチング素子と、
（ｅ）前記第３及び第５ビームが直交偏光となり前記第４及び第６ビームが直交偏光となるように前記第３、第４、第５及び第６ビームの偏光を回転させる第２偏光回転子と、
（ｆ）前記第２偏光回転子から前記第３、第４、第５及び第６ビームを受信し、前記第１スペクトル帯を含む前記第３及び第５ビームを空間的に再結合し、前記第２スペクトル帯を含む前記第４及び第６ビームを空間的に再結合する偏光結合素子とを有する複数の１×２波長スイッチを含む光クロスコネクト・ネットワーク。An optical cross-connect network interconnecting a first and second array of optical fibers carrying WDM optical signals having N optical channels, the optical cross-connect network comprising:
A first array of 1 × N wavelength switches each providing wavelength routing between an input port communicating with one of the first array of optical fibers and N output ports for each of the optical channels, A first array of 1 × N wavelength switches having a plurality of control states for selectively routing optical channels of different permutations to the output port;
A second array of 1 × N wavelength switches each providing wavelength routing between an input port and N output ports communicating with one of the second arrays of optical fibers for each of the optical channels, A second array of 1 × N wavelength switches having a plurality of control states in which the × N wavelength switch selectively routes different permutations of optical channels to the output port;
Interconnect means for providing optical communication between the output port of the first array of 1 × N wavelength switches and the output port of the second array of 1 × N wavelength switches;
Control means for selecting the control state of the first and second arrays of 1 × N wavelength switches to provide a desired interconnection between the first and second arrays of optical fibers;
At that time, the 1 × N wavelength switch is
(A) a polarization separation element that decomposes an input WDM signal into a first beam and a second beam that have orthogonal polarization and are spatially separated;
(B) a first control state in which the polarization of the first beam is rotated so as to substantially match the polarization of the second beam; and the polarization of the second beam is rotated so as to substantially match the polarization of the first beam. A first polarization rotator having a second control state, wherein the control state of the first polarization rotator is switchable by the control means;
(C) a wavelength filter coupled to receive the first and second beams from the first polarization rotator, wherein the wavelength filter has third and third polarizations in which the first beam has a polarization orthogonal to each other; A polarization-dependent optical transmission function that is decomposed into a fourth beam and the second beam is decomposed into fifth and sixth beams whose polarizations are orthogonal to each other; and the third and fifth beams are first Carrying a first spectral band of polarization, wherein the fourth and sixth beams carry a second spectral band of second polarization, wherein the first and second spectral bands are substantially complementary, and A wavelength filter in which the second polarization is orthogonal;
(D) a polarization-dependent routing element that spatially separates the third, fourth, fifth and sixth beams into two pairs of orthogonally polarized beams;
(E) Second polarization rotation that rotates the polarization of the third, fourth, fifth, and sixth beams so that the third and fifth beams are orthogonally polarized and the fourth and sixth beams are orthogonally polarized. With the child,
(F) receiving the third, fourth, fifth and sixth beams from the second polarization rotator, spatially recombining the third and fifth beams including the first spectral band, and An optical cross-connect network including a plurality of 1 × 2 wavelength switches having a polarization coupling element that spatially recombines the fourth and sixth beams including the second spectral band. 前記第１偏光回転子がさらに、
前記第１制御状態で前記第１ビームの偏光を回転させ、前記第２制御状態で前記第１ビームを回転せずに通過させる第１領域と、
前記第１制御状態で前記第２ビームを回転せずに通過させ、前記第２制御状態で前記第２ビームの偏光を回転させる第２領域とを備える、請求項２１に記載の光クロスコネクト・ネットワーク。The first polarization rotator further comprises:
A first region that rotates polarization of the first beam in the first control state and allows the first beam to pass through without rotation in the second control state;
The optical cross-connect according to claim 21 , further comprising: a second region that allows the second beam to pass without rotation in the first control state and rotates the polarization of the second beam in the second control state. network. 前記第２偏光回転器がさらに、
前記第５ビームの偏光を回転させる第１領域と、
前記第６ビームの偏光を回転させる第２領域と、
前記第３ビームを回転せずに通過させる第３領域と、
前記第４ビームを回転せずに通過させる第４領域とを備える、請求項２１に記載の光クロスコネクト・ネットワーク。The second polarization rotator further comprises:
A first region for rotating the polarization of the fifth beam;
A second region for rotating the polarization of the sixth beam;
A third region through which the third beam passes without rotation;
The optical cross-connect network according to claim 21 , further comprising a fourth region that allows the fourth beam to pass through without rotating. 前記波長フィルタが、各波長板が所定の方向を向いた積層された複数の複屈折波長板を備える、請求項２１に記載の光クロスコネクト・ネットワーク。The optical cross-connect network according to claim 21 , wherein the wavelength filter comprises a plurality of birefringent wave plates stacked with each wave plate facing a predetermined direction. 前記１×Ｎ光波長スイッチが１×４光波長スイッチであり、さらに、
前記ＷＤＭ信号を２つのスペクトル帯に分割する第１の１×２光波長スイッチと、
前記第１の１×２波長スイッチからの前記２つのスペクトル帯を４つの光チャネルに分割する並列の第２及び第３の１×２光波長スイッチとを備える、請求項２１に記載の光クロスコネクト・ネットワーク。The 1 × N optical wavelength switch is a 1 × 4 optical wavelength switch;
A first 1 × 2 optical wavelength switch that divides the WDM signal into two spectral bands;
23. The optical cross of claim 21 comprising parallel second and third 1x2 optical wavelength switches that divide the two spectral bands from the first 1x2 wavelength switch into four optical channels. Connect network. 前記１×４光波長スイッチがさらに、
前記４つの光チャネルの選択された第１及び第２のものに接続される第１の２×２光スイッチであって、前記第１の２×２光スイッチが前記制御手段の制御の元で前記第１及び第２光チャネルの順序を切換可能なように逆転させる第１の２×２光スイッチと、
前記４つの光チャネルの選択された第３及び第４のものに接続される第２の２×２光スイッチであって、前記第２の２×２光スイッチが前記制御手段の制御の元で前記第３及び第４光チャネルの順序を切換可能なように逆転させる第２の２×２光スイッチとを備える、請求項２５に記載の光クロスコネクト・ネットワーク。The 1 × 4 optical wavelength switch further includes:
A first 2 × 2 optical switch connected to a selected first and second one of the four optical channels, wherein the first 2 × 2 optical switch is under the control of the control means; A first 2 × 2 optical switch for reversibly reversing the order of the first and second optical channels;
A second 2 × 2 optical switch connected to a selected third and fourth of the four optical channels, wherein the second 2 × 2 optical switch is under the control of the control means; 26. The optical cross-connect network of claim 25 , comprising a second 2x2 optical switch that reverses the order of the third and fourth optical channels in a switchable manner. 前記波長フィルタが、前記偏光依存光伝送機能を提供する積層された複数の複屈折波長板を有する、請求項２１に記載の光クロスコネクト・ネットワーク。The optical cross-connect network of claim 21, wherein the wavelength filter comprises a plurality of stacked birefringent waveplates that provide the polarization-dependent optical transmission function. 前記積層された複数の複屈折波長板が、方解石、金紅石、ニオブ酸リチウム、及びＹＶＯThe plurality of laminated birefringent waveplates include calcite, gold pyroxene, lithium niobate, and YVO. ４4 ベースの結晶からなる材料のグループから選択される、請求項２７に記載の光クロスコネクト・ネットワーク。28. The optical cross-connect network of claim 27, selected from the group of materials consisting of a base crystal. 切換可能波長ルータであって、A switchable wavelength router,
ＷＤＭ光信号を受信し前記ＷＤＭ光信号を、直交偏光を有し空間的に分離された第１ビームと第２ビームとに分解する第１複屈折素子と、A first birefringent element that receives a WDM optical signal and decomposes the WDM optical signal into a first beam and a second beam that have orthogonal polarization and are spatially separated;
前記第１ビームの偏光を前記第２ビームの偏光とほぼ一致するように回転させる第１制御状態と、前記第２ビームの偏光を前記第１ビームの偏光とほぼ一致するように回転させる第２制御状態とを有する第１偏光回転子であって、前記第１偏光回転子の前記制御状態が外部制御信号によって切換可能である第１偏光回転子と、A first control state in which the polarization of the first beam is rotated to substantially match the polarization of the second beam; and a second control state in which the polarization of the second beam is rotated to approximately match the polarization of the first beam. A first polarization rotator having a control state, wherein the control state of the first polarization rotator is switchable by an external control signal;
前記第１偏光回転子から前記第１及び第２ビームを受信するよう結合された波長フィルタであって、前記波長フィルタが、前記第１ビームが偏光が互いに直交している第３及び第４ビームに分解され、前記第２ビームが偏光が互いに直交している第５及び第６ビームに分解されるような偏光依存光伝送機能を提供する積層された複数の複屈折波長板を有し、その際前記第３及び第５ビームが第１偏光の第１の所定のスペクトル帯を搬送し、前記第４及び第６ビームが第２偏光の第２の所定のスペクトル帯を搬送し、その際前記第１及び第２スペクトル帯がほぼ相補的であり前記第１及び第２偏光が直交する波長フィルタと、A wavelength filter coupled to receive the first and second beams from the first polarization rotator, wherein the wavelength filter includes third and fourth beams in which the first beam is orthogonally polarized; A plurality of stacked birefringent wave plates providing a polarization-dependent light transmission function such that the second beam is decomposed into fifth and sixth beams whose polarizations are orthogonal to each other, and Wherein the third and fifth beams carry a first predetermined spectral band of a first polarization, and the fourth and sixth beams carry a second predetermined spectral band of a second polarization, A wavelength filter in which the first and second spectral bands are substantially complementary and the first and second polarizations are orthogonal;
前記第３、第４、第５及び第６ビームを４つの水平偏光および垂直偏光成分に空間的に分離する第２複屈折素子と、A second birefringent element that spatially separates the third, fourth, fifth and sixth beams into four horizontally polarized and vertically polarized components;
前記第３及び第５ビームが直交偏光となり前記第４及び第６ビームが直交偏光となるように前記第３、第４、第５及び第６ビームの偏光を回転させる第２偏光回転子と、A second polarization rotator that rotates the polarization of the third, fourth, fifth, and sixth beams so that the third and fifth beams are orthogonally polarized and the fourth and sixth beams are orthogonally polarized;
前記第２偏光回転子から前記第３、第４、第５及び第６ビームを受信し、前記第１スペクトル帯を含む前記第３及び第５ビームを空間的に再結合し、前記第２Receiving the third, fourth, fifth and sixth beams from the second polarization rotator, spatially recombining the third and fifth beams including the first spectral band, and the second スペクトル帯を含む前記第４及び第６ビームを空間的に再結合する第３複屈折素子とを備えるルータ。And a third birefringent element that spatially recombines the fourth and sixth beams including a spectral band. 前記第１偏光回転子がさらに、The first polarization rotator further comprises:
前記第１制御状態で前記第１ビームの偏光を回転させ、前記第２制御状態で前記第１ビームを回転せずに通過させる第１領域と、A first region that rotates polarization of the first beam in the first control state and allows the first beam to pass through without rotation in the second control state;
前記第１制御状態で前記第２ビームを回転せずに通過させ、前記第２制御状態で前記第２ビームの偏光を回転させる第２領域とを備える、請求項２９に記載のルータ。30. The router according to claim 29, further comprising: a second region that allows the second beam to pass without rotation in the first control state and rotates the polarization of the second beam in the second control state. 前記第２偏光回転子がさらに、The second polarization rotator further comprises:
前記第５ビームの偏光を回転させる第１領域と、A first region for rotating the polarization of the fifth beam;
前記第６ビームの偏光を回転させる第２領域と、A second region for rotating the polarization of the sixth beam;
前記第３ビームを回転せずに通過させる第３領域と、A third region through which the third beam passes without rotation;
前記第４ビームを回転せずに通過させる第４領域とを備える、請求項２９に記載のルータ。30. The router according to claim 29, further comprising a fourth region that allows the fourth beam to pass through without rotating. 前記積層された複数の複屈折波長板が、方解石、金紅石、ニオブ酸リチウム、及びＹＶＯThe plurality of laminated birefringent waveplates include calcite, gold pyroxene, lithium niobate, and YVO. ４4 ベースの結晶からなる材料のグループから選択される、請求項２９に記載のルータ。30. The router of claim 29, selected from the group of materials consisting of a base crystal.
JP2000506740A 1997-08-08 1998-07-28 Multi-wavelength cross-connect optical network Pending JP2004500722A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/907,551 US6005697A (en) 1996-07-23 1997-08-08 Multi-wavelength cross-connect optical network
PCT/US1998/015618 WO1999008403A1 (en) 1997-08-08 1998-07-28 Multi-wavelength cross-connect optical network

Publications (2)

Publication Number Publication Date
JP2004500722A JP2004500722A (en) 2004-01-08
JP2004500722A5 true JP2004500722A5 (en) 2005-01-06

Family

ID=25424293

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000506740A Pending JP2004500722A (en) 1997-08-08 1998-07-28 Multi-wavelength cross-connect optical network

Country Status (6)

Country Link
EP (1) EP1002383A4 (en)
JP (1) JP2004500722A (en)
CN (1) CN1274494A (en)
AU (1) AU8666898A (en)
CA (1) CA2299402A1 (en)
WO (1) WO1999008403A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6519060B1 (en) 1999-06-04 2003-02-11 Chorum Technologies Lp Synchronous optical network in frequency domain
US6263129B1 (en) * 1999-07-06 2001-07-17 Avanex Corporation High-isolation dense wavelength division multiplexer utilizing a polarization beam splitter, non-linear interferometers and birefringent plates
EP1212640A4 (en) 1999-09-15 2003-01-22 Spectraswitch Inc Birefringent optical device
US6735016B1 (en) 1999-09-15 2004-05-11 Spectraswitch, Inc. Electro-optically controllable polarization insensitive optical device
EP1120987A1 (en) * 2000-01-28 2001-08-01 Telefonaktiebolaget L M Ericsson (Publ) Cross-connect protection
DE10243141B4 (en) * 2002-09-17 2006-05-11 Siemens Ag Method for transmitting optical polarization multiplexed signals
JP5004914B2 (en) * 2008-09-26 2012-08-22 日本電信電話株式会社 Optical cross-connect device and optical network

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55121215U (en) * 1979-02-21 1980-08-28
EP0307244A1 (en) * 1987-09-11 1989-03-15 BRITISH TELECOMMUNICATIONS public limited company An optical space switch
DE69013130T2 (en) * 1989-12-28 1995-03-09 Fujitsu Ltd Optical spatial switch and network with such optical spatial switches.
US5363228A (en) * 1993-03-05 1994-11-08 General Electric Company Optical device with spatial light modulators for switching arbitrarily polarized light
US5414540A (en) * 1993-06-01 1995-05-09 Bell Communications Research, Inc. Frequency-selective optical switch employing a frequency dispersive element, polarization dispersive element and polarization modulating elements
US5694233A (en) * 1996-07-23 1997-12-02 Macro-Vision Communications, Llc Switchable wavelength router

Similar Documents

Publication Publication Date Title
US6005697A (en) Multi-wavelength cross-connect optical network
US5912748A (en) Switchable wavelength router
CA2285283C (en) N x m optical wavelength routing switch
US6049404A (en) N+M digitally programmable optical routing switch
US5946116A (en) 1 X N digitally programmable optical routing switch
US5694233A (en) Switchable wavelength router
US6545779B1 (en) System for dealing with faults in an optical link
US6600582B1 (en) Optical add/drop wavelength switch
US6288807B1 (en) Optical wavelength router
US6545783B1 (en) Optical wavelength add/drop multiplexer
US6275312B1 (en) Optical routing switch
WO2010146589A1 (en) Multiple port wavelength selectable router
JP2004500722A5 (en)
JP2004500722A (en) Multi-wavelength cross-connect optical network
US6490377B1 (en) Optical interleaver