JP4763013B2 - 遅延復調デバイスの位相調整方法 - Google Patents
遅延復調デバイスの位相調整方法 Download PDFInfo
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- JP4763013B2 JP4763013B2 JP2008083639A JP2008083639A JP4763013B2 JP 4763013 B2 JP4763013 B2 JP 4763013B2 JP 2008083639 A JP2008083639 A JP 2008083639A JP 2008083639 A JP2008083639 A JP 2008083639A JP 4763013 B2 JP4763013 B2 JP 4763013B2
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/676—Optical arrangements in the receiver for all-optical demodulation of the input optical signal
- H04B10/677—Optical arrangements in the receiver for all-optical demodulation of the input optical signal for differentially modulated signal, e.g. DPSK signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/223—Demodulation in the optical domain
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0136—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0147—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on thermo-optic effects
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
- G02F1/212—Mach-Zehnder type
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/20—Intrinsic phase difference, i.e. optical bias, of an optical modulator; Methods for the pre-set thereof
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Description
また、第2のステップにおいて、各マッハツェンダー干渉計の2つのアーム導波路の中央部に1/2波長板を挿入した後、挿入された各1/2波長板を平面光波回路上に接着固定する際に、偏波乖離量をモニターして偏波乖離量が最も小さくなる位置で、各1/2波長板を平面光波回路上に固定するようにしている。これにより、より偏波乖離量が小さい遅延復調デバイスを作製することができる。
図1に示す遅延復調デバイス1は、DQPSK信号を復調させる平面光波回路型(PLC型)の遅延復調デバイス(復調器)である。この遅延復調デバイス1は、例えば、伝送速度が40GbpsのDQPSK方式を用いた図2に示す光伝送システムに使用される40GbpsDQPSK用遅延復調デバイスである。
次に、上述したDQPSK信号を復調させる平面光波回路型の遅延復調デバイス1の位相調整方法を説明する。
まず、第1および第2のマッハツェンダー干渉計4,5の2つのアーム導波路上のヒータのうち、偏波乖離量が小さくなる方のヒータにそれぞれ給電して、偏波乖離量を低減させる。
第1のステップで偏波乖離量を低減させた後、第1のマッハツェンダー干渉計4の2つのアーム導波路8,9の中央部に1/2波長板47を、第2のマッハツェンダー干渉計5の2つのアーム導波路12,13の中央部に1/2波長板48をそれぞれ挿入する。
1/2波長板47,48の挿入後、2つのマッハツェンダー干渉計4,5の少なくとも一方の、第1のステップで偏波乖離量を低減させた際に給電したのと同一のヒータに給電して、第1のマッハツェンダー干渉計4と第2のマッハツェンダー干渉計5間での位相差がπ/2になるように位相を調整する。
[実施例]
図3に示すシリコン基板30上に、石英系ガラスで構成される光入力導波路2、Y分岐導波路3、マッハツェンダー干渉計4,5、光出力導波路21乃至24、および2つの遅延部41,42を含む平面光波回路(PLC)1Aを、火炎堆積法(FHD法)、フォトリソグラフィ、反応性イオンエッチングにより形成した40GbpsのDQPSK用の遅延復調デバイス1を作製した。
○第1のステップで、第1および第2のマッハツェンダー干渉計4,5の2つのアーム導波路上のヒータのうち、偏波乖離量が小さくなる方のヒータにそれぞれ給電することにより、図7に示すように偏波乖離量(PDλ)を低減させることができる。
1A…平面光波回路
1B…PLCチップ
2…光入力導波路
3…Y分岐導波路
4…第1のマッハツェンダー干渉計
5…第2のマッハツェンダー干渉計
6,10…入力側カプラ
7,11…出力側カプラ
8,9,12,13…アーム導波路
14,15…Y分岐導波路で分岐された導波路
21,22,23,24…光出力導波路
30…PLC基板
31…クラッド層
41…第1遅延部
42…第2遅延部
A〜H…ヒータ
47,48…1/2波長板
49…溝
60…樹脂
Claims (1)
- 長さの異なる2つのアーム導波路をそれぞれ有し、DQPSK信号が分岐されて入力される2×2の2つのマッハツェンダー干渉計と、各マッハツェンダー干渉計の前記2つのアーム導波路上にそれぞれ2つずつ形成されたヒータと、を備え、DQPSK信号を復調させる平面光波回路型の遅延復調デバイスの位相調整方法であって、
前記ヒータは、1/2波長板が挿入される前記アーム導波路の中央部を挟んで両側に同じヒータ長及び同じヒータ幅のものが形成されており、
前記各マッハツェンダー干渉計の前記2つのアーム導波路上のヒータのうち、偏波乖離量が小さくなる方の2つのヒータのそれぞれに偏波乖離量がこれ以上低減しなくなるまでの時間給電して、偏波乖離量を低減させる第1のステップと、
前記第1のステップで偏波乖離量を低減させた後、前記各マッハツェンダー干渉計の前記2つのアーム導波路に1/2波長板を挿入する第2のステップと、
前記1/2波長板の挿入後、前記2つのマッハツェンダー干渉計の少なくとも一方の、前記第1のステップで偏波乖離量を低減させた際に給電したのと同一のヒータに給電して、前記2つのマッハツェンダー干渉計間での位相を調整する第3のステップと、を備え、
前記第2のステップでは、前記各マッハツェンダー干渉計の前記2つのアーム導波路の中央部に1/2波長板を挿入した後、挿入された各1/2波長板を平面光波回路上に接着固定する際に、偏波乖離量をモニターして偏波乖離量が最も小さくなる位置で、前記各1/2波長板を平面光波回路上に固定することを特徴とする遅延復調デバイスの位相調整方法。
Priority Applications (2)
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JP2008083639A JP4763013B2 (ja) | 2008-03-27 | 2008-03-27 | 遅延復調デバイスの位相調整方法 |
US12/412,847 US7813032B2 (en) | 2008-03-27 | 2009-03-27 | Methods to control phase shifts of delay demodulation devices |
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JP2008083639A JP4763013B2 (ja) | 2008-03-27 | 2008-03-27 | 遅延復調デバイスの位相調整方法 |
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JP2009237300A JP2009237300A (ja) | 2009-10-15 |
JP4763013B2 true JP4763013B2 (ja) | 2011-08-31 |
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20110085761A1 (en) * | 2009-05-26 | 2011-04-14 | Furukawa Electric Co., Ltd. | Arrayed waveguide grating and method of manufacturing arrayed waveguide grating |
WO2011027883A1 (ja) | 2009-09-04 | 2011-03-10 | 古河電気工業株式会社 | 90度ハイブリッド |
WO2011152202A1 (ja) | 2010-05-31 | 2011-12-08 | 古河電気工業株式会社 | Plc型復調用遅延回路及びplc型光干渉計 |
JP2012203129A (ja) * | 2011-03-24 | 2012-10-22 | Furukawa Electric Co Ltd:The | 光導波回路およびその製造方法ならびに光導波回路装置 |
CN102377491B (zh) * | 2011-10-18 | 2014-11-19 | 武汉光迅科技股份有限公司 | 一种平面光波导型差分正交相移键控解调器 |
Citations (2)
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JP2007201939A (ja) * | 2006-01-27 | 2007-08-09 | Fujitsu Ltd | 差動m位相偏移変調信号の復調用干渉計 |
JP2007286426A (ja) * | 2006-04-18 | 2007-11-01 | Nippon Telegr & Teleph Corp <Ntt> | 光信号処理器 |
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US6546161B2 (en) * | 2000-01-21 | 2003-04-08 | Nippon Telegraph And Telephone Corporation | No polarization dependent waveguide type optical circuit |
US6961492B2 (en) * | 2003-09-17 | 2005-11-01 | Lucent Technologies Inc. | Tunable dispersion compensator |
JP4440855B2 (ja) | 2005-08-25 | 2010-03-24 | 富士通株式会社 | Rz−dpsk光受信回路 |
US7480091B2 (en) * | 2007-03-06 | 2009-01-20 | The Furukawa Electric Co., Ltd. | Delay-line demodulator and method of adjusting a phase shift in the demodulator |
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- 2008-03-27 JP JP2008083639A patent/JP4763013B2/ja not_active Expired - Fee Related
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- 2009-03-27 US US12/412,847 patent/US7813032B2/en not_active Expired - Fee Related
Patent Citations (2)
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JP2007201939A (ja) * | 2006-01-27 | 2007-08-09 | Fujitsu Ltd | 差動m位相偏移変調信号の復調用干渉計 |
JP2007286426A (ja) * | 2006-04-18 | 2007-11-01 | Nippon Telegr & Teleph Corp <Ntt> | 光信号処理器 |
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JP2009237300A (ja) | 2009-10-15 |
US7813032B2 (en) | 2010-10-12 |
US20100067098A1 (en) | 2010-03-18 |
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