JP5059601B2 - Wdm送信ネットワーク用クーラーレス集積回路および浮動波長グリッドフォトニック集積回路(pic) - Google Patents
Wdm送信ネットワーク用クーラーレス集積回路および浮動波長グリッドフォトニック集積回路(pic) Download PDFInfo
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- JP5059601B2 JP5059601B2 JP2007508548A JP2007508548A JP5059601B2 JP 5059601 B2 JP5059601 B2 JP 5059601B2 JP 2007508548 A JP2007508548 A JP 2007508548A JP 2007508548 A JP2007508548 A JP 2007508548A JP 5059601 B2 JP5059601 B2 JP 5059601B2
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- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
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Description
本明細書をより十分に理解するために、本明細書全体にわたって用いられる特定の用語に関して、以下のように定義する。
これまで、長距離光通信の場合、光送信器は、主に光学的にファイバ接続されたディスクリート半導体レーザーソースと、離散外部変調器とを備えていた。ほとんどの場合、レーザーソースにはDFBレーザーが選択され、変調器にはマッハツェンダリチウムニオブ酸塩変調器が選択されている。最近では、同一基板上に集積された、モノリシックDBRまたはDFBレーザー/電界吸収(EA)変調器(EAM)を備えた、これらの2つの構成要素を集積したものが市販されるようになった。ほとんどの場合、レーザーソースにはDFBレーザーが選択されている。これらの装置はまた、EML(電界吸収変調器/レーザー)とも称される。EA変調器とDFBまたはDBRレーザーのような単一周波レーザーとをモノリシックに集積することが非常に望ましい。EA変調器のような外部で変調されるレーザーソースは、それらの固有の低静的チャープから、直接変調されるレーザーソースよりも魅力的である。これらのEMLは、以下の点において、上述の離散レーザー/変調器を超える利点を有する。(1)レーザーと変調器との間の結合または挿入損失が減じられるか、またはごくわずかであり、安定した信頼性の高い変調ソースを達成する。(2)レーザー/変調器インターフェースまたは変調器面からのフィードバック反射の少なくとも一部による、レーザーチャープは、無視できないにしても減じられる。(3)集積装置などの製造コストがより低い。
本発明によれば、EML、TxPIC、およびRxPICのようなPICは、広い温度範囲にわたって非冷却で動作することができるので、長距離、メトロ、WAN、またはLANでの使用に関わらず、光伝送ネットワークまたは光通信ネットワークにおける光トランスポンダモジュールまたは光送受信モジュールのための使用において、密封パッケージおよび付属のクーラーを備えたTECサブマウントのような高価なパッケージングを、排除できないにせよ、多くの場合抑制することができる。非冷却WDM送信器を実現するための主要な課題は、動作波長の制御であり、今日知られているように、DWDMシステムなどにおいて、送信波長の正確な制御を意味し、一方で、送信器の波長を変化させるために、温度における環境の変化が本質的に機能することである。本発明は、斬新な検出スキームおよび適応型アルゴリズムによって、新しいDWDMシステムの方法を目的とし、その性能を最適化し、DWDMシステム内の光送受信器が非冷却で動作するために、PICの高機能な制御を提供する。送信器のチャープのような高速動作のパラメータの制御は、満足な品質データが実現されることを、依然として継続的に確保する。
Claims (15)
- 光送信ネットワークであって、
前記光送信ネットワークは、
クーラーレス光送信器であって、前記光送信器は、複数の光源と、前記複数の光源に結合された第1回路と、複数の入力および1つの出力を有する光コンバイナとを含み、前記複数の光源の各々は、前記光送信器が第1温度を有することに応答して、複数の第1光信号のうちの対応する1つの第1光信号を出力するように構成され、前記複数の第1光信号の各々は、複数の第1波長のうちの対応する1つの第1波長を有し、前記複数の第1波長は、波長グリッドを形成し、前記光送信器が第2温度を有することに応答して、前記複数の光源の各々は、複数の第2光信号のうちの対応する1つの第2光信号を出力し、前記第1回路は、前記複数の第2光信号の各々が複数の第2波長のうちの対応する1つの第2波長を有するように前記複数の光源を制御するように構成され、前記複数の第2波長の各々は、前記複数の第1波長のうちの対応する1つの第1波長に対して均一にシフトされており、前記光コンバイナの前記複数の入力の各々は、前記複数の第2光信号のうちの対応する1つの第2光信号を受信し、前記複数の第2光信号を組み合わせて、前記光コンバイナの前記出力において提供される波長分割多重(WDM)光信号を生成するように構成される、光送信器と、
光受信器であって、前記光受信器は、1つの入力および複数の出力を有する光デコンバイナを含み、前記光デコンバイナはさらに、関連フィルタグリッドを有し、前記光デコンバイナの前記入力は、前記WDM信号を受信するように構成される、光受信器と、
複数のフォトダイオードであって、前記複数のフォトダイオードの各々は、前記光デコンバイナの前記複数の出力のうちの1つの出力に結合されており、前記複数のフォトダイオードは、電気信号を生成する、フォトダイオードと、
第2回路であって、前記第2回路は、前記光デコンバイナに結合されており、前記第2回路は、前記フィルタグリッドの少なくとも一部が前記波長グリッドの少なくとも一部とマッチするように、制御信号に応答して前記フィルタグリッドをスペクトル的にシフトさせるように構成され、前記光デコンバイナは、前記複数の第2光信号の各々が前記光デコンバイナの前記複数の出力のうちの対応する1つの出力により提供されるように、前記WDM信号を逆多重化する、第2回路と、
第3回路であって、前記第3回路は、少なくとも部分的に前記電気信号に基づいて前記制御信号を生成するように構成される、第3回路と
を含み
前記複数の第1波長の各々は、複数の第1チャネル間隔のうちの対応する1つの第1チャネル間隔だけ互いにスペクトル的に離れており、前記複数の第2波長の各々は、複数の第2チャネル間隔のうちの対応する1つの第2チャネル間隔だけ互いにスペクトル的に離れており、前記第1回路はさらに、複数のヒーターおよび1つの制御器を備え、前記複数のヒーターの各々は、前記複数の光源のうちのそれぞれの1つの光源に結合され、前記制御器は、前記複数の第1チャネル間隔および前記複数の第2チャネル間隔の各々が実質的に一定に維持されるように、前記複数のヒーターのうちの対応する1つのヒーターに複数のバイアス値のうちの1つのバイアス値を適用する、光送信ネットワーク。 - 前記複数の第1波長の各々は、複数の第1チャネル間隔のうちの対応する1つの第1チャネル間隔だけ互いにスペクトル的に離れており、前記複数の第2波長の各々は、複数の第2チャネル間隔のうちの対応する1つの第2チャネル間隔だけ互いにスペクトル的に離れており、前記複数の第1チャネル間隔および前記第2チャネル間隔の各々は、実質的に同一である、請求項1に記載の光送信ネットワーク。
- 前記光送信器は、送信フォトニック集積回路(TxPIC)チップを含む、請求項1に記載の光送信ネットワーク。
- 前記光受信器は、受信フォトニック集積回路(RxPIC)チップを含む、請求項1に記載の光送信ネットワーク。
- 前記第2回路は、前記光デコンバイナに結合されたヒーターを含み、前記光デコンバイナの前記波長グリッドが前記ヒーターによりスペクトル的にシフトされる、請求項1に記載の光送信ネットワーク。
- 前記第2回路は、前記光デコンバイナに結合された電気光学デバイスを含み、前記光デコンバイナの前記波長グリッドが前記電気光学デバイスによりスペクトル的にシフトされる、請求項1に記載の光送信ネットワーク。
- 前記光デコンバイナは、複数の格子アームを有するアレイ波長格子であり、前記電気光学デバイスは、前記複数の格子アームにわたって電場を印加するように構成される、請求項5に記載の光送信ネットワーク。
- 前記光送信器の前記第2温度は、周囲の室温よりも高い、請求項1に記載の光送信ネットワーク。
- 前記第2温度は、約30℃〜約85℃の範囲内にある、請求項1に記載の光送信ネットワーク。
- 前記複数の第1波長の各々は、複数の第1チャネル間隔のうちの対応する1つの第1チャネル間隔だけ互いにスペクトル的に離れており、前記複数の第2波長の各々は、対応する間隔だけ互いにスペクトル的に離れており、前記複数の第1チャネル間隔のうちの少なくとも1つおよび複数の第2チャネル間隔のうちの少なくとも1つは、前記複数の第1および第2チャネル間隔のうちの残りの間隔とは異なる、請求項1に記載の光送信ネットワーク。
- 前記光コンバイナは、波長選択性コンバイナである、請求項1に記載の光送信システム。
- 前記波長選択性コンバイナは、アレイ波長格子、エシェル格子、カスケード式マッハツェンダ干渉計、および自由空間回折格子からなる群より選択される、請求項11に記載の光送信システム。
- 前記光コンバイナは、出力カップラー、スターカップラー、およびMMIカップラーからなる群より選択される、請求項1に記載の光送信ネットワーク。
- 光送信ネットワークであって、
前記光送信ネットワークは、
クーラーレス光送信器であって、前記光送信器は、複数の光源と、前記複数の光源に結合された第1回路と、複数の入力および1つの出力を有する光コンバイナとを含み、前記複数の光源の各々は、前記光送信器が第1温度を有することに応答して、複数の第1光信号のうちの対応する1つの第1光信号を出力するように構成され、前記複数の第1光信号の各々は、複数の第1波長のうちの対応する1つの第1波長を有し、前記複数の第1波長は、波長グリッドを形成し、前記光送信器が第2温度を有することに応答して、前記複数の光源の各々は、複数の第2光信号のうちの対応する1つの第2光信号を出力し、前記第1回路は、前記複数の第2光信号の各々が複数の第2波長のうちの対応する1つの第2波長を有するように前記複数の光源を制御するように構成され、前記複数の第2波長の各々は、前記複数の第1波長のうちの対応する1つの第1波長に対して均一にシフトされており、前記光コンバイナの前記複数の入力の各々は、前記複数の第2光信号のうちの対応する1つの第2光信号を受信し、前記複数の第2光信号を組み合わせて、前記光コンバイナの前記出力において提供される波長分割多重(WDM)光信号を生成するように構成される、光送信器と、
光サービスチャネル送信器であって、前記光サービスチャネル送信器は、光サービスチャネルを供給するように構成される、光サービスチャネル送信器と、
光受信器であって、前記光受信器は、1つの入力および複数の出力を有する光デコンバイナを含み、前記光デコンバイナはさらに、関連フィルタグリッドを有し、前記光デコンバイナの前記入力は、前記WDM信号を受信するように構成される、光受信器と、
複数のフォトダイオードであって、前記複数のフォトダイオードの各々は、前記光サービスチャネルの少なくとも一部を受信するように構成される、フォトダイオードと、
第2回路であって、前記第2回路は、前記光デコンバイナに結合されており、前記第2回路は、前記フィルタグリッドの少なくとも一部が前記波長グリッドの少なくとも一部とマッチするように、制御信号に応答して前記フィルタグリッドをスペクトル的にシフトさせるように構成され、前記光デコンバイナは、前記複数の第2光信号の各々が前記光デコンバイナの前記複数の出力のうちの対応する1つの出力により提供されるように、前記WDM信号を逆多重化する、第2回路と、
第3回路であって、前記第3回路は、前記光サービスチャネルに応答して前記制御信号を生成するように構成される、第3回路と
を含み、
前記複数の第1波長の各々は、複数の第1チャネル間隔のうちの対応する1つの第1チャネル間隔だけ互いにスペクトル的に離れており、前記複数の第2波長の各々は、複数の第2チャネル間隔のうちの対応する1つの第2チャネル間隔だけ互いにスペクトル的に離れており、前記第1回路はさらに、複数のヒーターおよび1つの制御器を備え、前記複数のヒーターの各々は、前記複数の光源のうちのそれぞれの1つの光源に結合され、前記制御器は、前記複数の第1チャネル間隔および前記複数の第2チャネル間隔の各々が実質的に一定に維持されるように、前記複数のヒーターのうちの対応する1つのヒーターに複数のバイアス値のうちの1つのバイアス値を適用する、光送信ネットワーク。 - 前記制御信号は、前記電気信号に関連したビットエラーレート(BER)に少なくとも部分的に基づいて生成される、請求項14に記載の光送信ネットワーク。
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- 2005-04-14 CA CA2562790A patent/CA2562790C/en not_active Expired - Fee Related
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- 2005-04-14 EP EP05735582.8A patent/EP1740992B1/en active Active
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US7636522B2 (en) | 2009-12-22 |
US9031412B2 (en) | 2015-05-12 |
CN1997924A (zh) | 2007-07-11 |
JP2007532980A (ja) | 2007-11-15 |
US20050249509A1 (en) | 2005-11-10 |
EP1740992B1 (en) | 2018-10-10 |
CA2562790C (en) | 2012-10-02 |
EP1740992A2 (en) | 2007-01-10 |
CA2562790A1 (en) | 2005-11-10 |
US20100166424A1 (en) | 2010-07-01 |
WO2005106546A2 (en) | 2005-11-10 |
WO2005106546A3 (en) | 2006-05-11 |
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