CN1005235B - 平衡相干接收器 - Google Patents

平衡相干接收器 Download PDF

Info

Publication number
CN1005235B
CN1005235B CN86100077.3A CN86100077A CN1005235B CN 1005235 B CN1005235 B CN 1005235B CN 86100077 A CN86100077 A CN 86100077A CN 1005235 B CN1005235 B CN 1005235B
Authority
CN
China
Prior art keywords
receiver
output
error signal
local oscillator
detector
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
Application number
CN86100077.3A
Other languages
English (en)
Other versions
CN86100077A (zh
Inventor
理查德·爱德华·爱泼互斯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
STC PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by STC PLC filed Critical STC PLC
Publication of CN86100077A publication Critical patent/CN86100077A/zh
Publication of CN1005235B publication Critical patent/CN1005235B/zh
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • H04B10/61—Coherent receivers
    • H04B10/63—Homodyne, i.e. coherent receivers where the local oscillator is locked in frequency and phase to the carrier signal

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

在采用平衡光电探测器的相干光接收器中，本机振荡器的强度波动是通过其与非理想平衡的输出作相关的比较而化为零，以得到一个用于反馈回路而使平衡达到最佳化的误差信号。

Description

平衡相干接收器
本发明涉及平衡相干接收器。
已调信号的相干检测的一般原理确已建立。在由纽约威利（Weily）出版公司出版，蒙带·罗斯（Monte Ross）所著的《激光接收器》一书中描述了光通信系统领域内使用激光本机振荡器和平衡检测器的相干接收器，该书的112～113页有一种接收器的说明，输入信号加本机振荡器参照信号馈给一对基本相同的检测器中的一只，与此同时，输入信号减本机振荡器参照信号则馈给这一对检测器中的另一只。除了射束分裂器外，该装置需要两块半镀银镜，一个用于本机振荡信号的180°换相器以及用于两个检测器输出的基片电路，来自两个检测器的相减输出便形成输出信号。
所以一个惯用的相干光接收器需要接收信号场E1与较大的本机振荡器场E2之和，其结果由光电检测器PD检测（图1）。因为对场来说有一个平方律灵敏度（E1+E2）[（E1+E2）2＝E1 2+E2 2+2E1E2＝I1+I2+2E1E2]，故输出O/P包含一个分量2E1·E2与两个场的乘积成正比，因此本机振荡器场E2越大，则相干增益越大。一个理想的大量值本机振荡器，其灵敏度仅受量子噪声的限止。然而，实际上本机振荡器有一些不需要的调幅（强度噪声），它出现在分量I2中，LO越大，与接收器输出耦合的AM（调幅）噪声越大。
前面已经提及到平衡接收器将允许把AM噪声平衡掉，在我们的英国专利书2121636A中，已叙述一个相干光接收器，在该接收器中，混频器的两个输出都可在接收放大器中被检测和反相迭加。这就抵消了由本机振荡器引起的大的光电流变化。
平衡输入接收器如图2所示，具有吸引力的是它把双检测器接收器PD1，PD2的杂散电容的影响减到最小，并且使大的本机振荡器（LO）的直流光电流分量化为零，否则该分量将产生接收器动态范围的问题。
或者，这也可通过对两个独立的接收器的增益进行电平衡而达到，正如艾贝斯·G等人发表在1984年光纤通讯会议录第34～35页上的论文TUA2（ABBAS·Get al TUA2 pp34，35，Proc.OFC′84）所描述并由图3所表示的一样。
LO强度波动被抑制的程度决定于平衡精度。10%的（强度）平衡误差将得到十倍的改进，1%的（强度）平衡误差将得到一百倍的改进，依此类推。完善的平衡是理想的，但要达到它却有一些障碍。耦合器（功率分配器）通常对温度和应力是敏感的，成对的光电检测器可能有不同的响应度，光纤对检测器的损耗也可能有所不同。即使最初可以把平衡调整到最佳状态，但是环境条件的微小变化将对此产生干扰，所以很少有机会达到足够精确与稳定的平衡，以致无法抑制大的本机振荡器信号中出现的波动。
依照本发明，提供一个相干光接收器，其中本机振荡的强度波动是与处于不完善平衡状态下的接收器的输出进行互相关的，以此得到一个误差信号，该误差信号通过反馈控制电路，被用来使平衡达到最佳状态。
为了使本发明清楚易懂，可以参见附图，其中：
图1是按已有技术和已经提及的单端相干接收器的方框图。
图2也是按已有技术和已经提及的具有单个低噪声放大器的平衡接收器的方框图。
图3是按已有技术和已经提及的具有独立的低噪声放大器和电平衡电路的平衡接收器的方框图。
图4是具体表示本发明的相干接收器的方框图。
图5A是另一个具体表示本发明的相干接收器的方框图。
图5B是图5A接收器经改进后的方框图。
图6是根据本发明进一步具体化的相干接收器的方框图。
图7显示平衡接收器使本机振荡器波动化为零的三种方法。
图4的接收器是由一个本机振荡器LO，一个对本机振荡器进行光学监视的光电检测器PD和一个互相关器CC组成，该互相关器CC使监视器输出与来自差动放大器DA的电信号输出O/P进行相关处理。
光输入信号I/P和本机振荡器信号馈给一个光耦合器，该光耦合器，举例说，可以是一个半镀银镜的光束组合器，或者更可取的可以是一个采用双锥形熔融成型工艺用光纤制造的耦合器。
组合器的产物被施加到各自的光检测器PD1、PD2，光检测器PD1、PD2又把输出提供给低噪声放大器LNA1、LNA2低噪声放大器LNA1、LNA2再把放大信号馈给可变差动增益控制电路DGC，它受来自互相关器CC的误差控制信号EC支配，通过独立的光电检测器PD监视有害的本机振荡器波动盖将其与接收器输出信号进行互相关的处理，便可得到不平衡误差控制信号。相关器的输出就是所需的误差信号ES，它通过可变的差动增益控制电路DGC调节平衡，DGC的输出是在差动放大器DA中放大的。
图5A表示获取误差信号的另一种方案，图中表明一个光平衡接收器的相关反馈控制。在此，本机振荡器LO输出和光输入信号I/P馈给一个光纤耦合器，它的耦合比可由温度应力电压机理（如铌酸锂）来控制，来自耦合器的输出馈给光电二极管PD1、PD2并在低噪声放大器LNA中放大。该输出由一互相关器CC感出，互相关器CC′使电输出信号O/P与经由监视器得到的光电检测器

Claims (6)

1、一个相干光接收器，其特征包括本机振荡器和使本振荡器的振荡强度波动与接收器的输出进行互相关的互相关器，在接收器处于平衡不完善情况下时，互相关器产生一误差信号;及被设置和连接成使平衡达到最佳的反馈控制电路。
2、如权利要求1所述的接收器，其特征在于具有平衡检测器并且所述的反馈控制电路包括可变差动增益控制电路，该电路在误差信号控制下作出响应，以便差动地调整平衡检测器的输出之比。
3、如权利要求1所述的接收器，其特征在于所述接收器包括一连接成接收送到接收器的光输入和本机振荡器输入的光耦合器，在误差信号的控制下，该耦合器的耦合比是可变的。
4、如权利要求3所述的接收器，可调制其本机振荡器的振幅以产生波动，反馈控制电路包含一个从接收器输出取得误差信号的同步检波器，并用这误差信号去改变耦合器的耦合比。
5、如权利要求1所述的接收器，其特征在于包括连成接收送到接收器的光输入和本机振荡器的输入的光耦合器，及设置成接收光耦合器的输出的光电检测器，且检测器的响应度通过改变取决于误差信号的检测器的偏压进行控制。
6、如权利要求3所述的接收器，其特征在于直流信号是从该接收器的输出得到的，并用作误差控制信号，以控制耦合比。
CN86100077.3A 1985-03-07 1986-01-06 平衡相干接收器 Expired CN1005235B (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8505937 1985-03-07
GB8505937A GB2172164B (en) 1985-03-07 1985-03-07 Balanced coherent receiver

Publications (2)

Publication Number Publication Date
CN86100077A CN86100077A (zh) 1986-11-05
CN1005235B true CN1005235B (zh) 1989-09-20

Family

ID=10575611

Family Applications (1)

Application Number Title Priority Date Filing Date
CN86100077.3A Expired CN1005235B (zh) 1985-03-07 1986-01-06 平衡相干接收器

Country Status (8)

Country Link
US (1) US4718121A (zh)
EP (1) EP0194786B1 (zh)
JP (1) JPS61208327A (zh)
CN (1) CN1005235B (zh)
AU (1) AU588283B2 (zh)
DE (1) DE3681473D1 (zh)
ES (1) ES8707041A1 (zh)
GB (1) GB2172164B (zh)

Families Citing this family (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172766B (en) * 1985-03-21 1988-12-21 Stc Plc Optical receiver
DE3770358D1 (de) * 1986-07-21 1991-07-04 Siemens Ag Optischer ueberlagerungsempfaenger fuer insbesondere phasensprungmoduliertes licht.
NL8602864A (nl) * 1986-11-12 1988-06-01 Philips Nv Inrichting voor optische heterodyne detektie van een optische signaalbundel en optisch transmissiesysteem voorzien van een dergelijke inrichting.
EP0302275A3 (de) * 1987-08-04 1991-03-27 Siemens Aktiengesellschaft Vorrichtung zum Detektieren intensitätsmodulierter Lichtsignale
EP0307721B1 (de) * 1987-09-11 1992-10-28 Siemens Aktiengesellschaft Optischer Überlagerungsempfänger mit Dreifachfaserkoppler
US4900917A (en) * 1988-07-15 1990-02-13 American Telephone And Telegraph Company, At&T Bell Laboratories Polarization insensitive optical communication device utilizing optical preamplification
NL8900389A (nl) * 1989-02-17 1990-09-17 Philips Nv Optische koherente ontvanger.
GB8920733D0 (en) * 1989-09-13 1989-10-25 British Telecomm An optical detector
US5134276A (en) * 1990-10-09 1992-07-28 International Business Machines Corporation Noise cancelling circuitry for optical systems with signal dividing and combining means
JPH04278737A (ja) * 1991-03-06 1992-10-05 Kokusai Denshin Denwa Co Ltd <Kdd> コヒーレント光受信器
NL9201130A (nl) * 1992-06-25 1994-01-17 Nederland Ptt Optische menginrichting met een fotodetector voor een heterodyne ontvanger.
US5483368A (en) * 1992-11-18 1996-01-09 Kabushiki Kaisha Toshiba Optical communication system suitable for selective reception of multiple services
US5491682A (en) * 1994-09-21 1996-02-13 Eastman Kodak Company Apparatus and method for controllable gain and phase matching in an optical data storage system with source noise subtraction
US5537383A (en) * 1995-03-01 1996-07-16 Eastman Kodak Company Optical data storage system with differential data detection and source noise subtraction for use with magneto-optic, write-once and other optical media
US5586101A (en) * 1995-03-01 1996-12-17 Eastman Kodak Company Magneto-optic data storage system with differential detection channels having separate gain control circuit
US6356381B1 (en) 1997-12-19 2002-03-12 The United States Of America As Represented By The Secretary Of Commerce Multi-wavelength cross-correlator for ultrashort radiation pulses
US6157752A (en) * 1998-09-21 2000-12-05 Bae Systems Aerospace Electronics Inc. Fiber optic link
WO2004107567A1 (ja) * 2003-05-29 2004-12-09 Mitsubishi Denki Kabushiki Kaisha 光制御型フェーズドアレーアンテナ装置
US7373091B2 (en) * 2003-09-25 2008-05-13 Lucent Technologies Inc. Multicasting optical switch fabric and method of detection based on novel heterodyne receiver
US7330669B2 (en) * 2004-04-20 2008-02-12 Lucent Technologies Inc. Optical heterodyne receiver based on oversampling
US7477852B2 (en) * 2005-01-31 2009-01-13 Alcatel-Lucent Usa Inc. Optical receiver apparatus and method
US7742701B2 (en) * 2005-03-16 2010-06-22 Michael George Taylor Coherent optical channel substitution
US7406269B2 (en) * 2006-03-10 2008-07-29 Discovery Semiconductors, Inc. Feedback-controlled coherent optical receiver with electrical compensation/equalization
US7941059B1 (en) * 2006-04-28 2011-05-10 Hrl Laboratories, Llc Down conversion for distortion free recovery of a phase modulated optical signal
US7877020B1 (en) 2006-04-28 2011-01-25 Hrl Laboratories, Llc Coherent RF-photonic link linearized via a negative feedback phase-tracking loop
JP4918400B2 (ja) * 2007-04-27 2012-04-18 富士通株式会社 光信号受信装置
US8126338B2 (en) * 2007-11-07 2012-02-28 Discovery Semiconductors, Inc. Method and apparatus for repeaterless high-speed optical transmission over single-mode fiber using coherent receiver and electronic dispersion compensation
US8204378B1 (en) 2008-03-27 2012-06-19 Tektronix, Inc. Coherent optical signal processing
WO2009134221A1 (en) * 2008-04-30 2009-11-05 Optical Air Data Systems, Llc Laser doppler velocimeter
JP2010081274A (ja) * 2008-09-26 2010-04-08 Nihon Univ 光通信波長帯における高速パルス型ホモダイン検波器
WO2010045286A1 (en) * 2008-10-14 2010-04-22 Schlumberger Canada Limited Polarization-diverse, heterodyne optical receiving system
JP5444877B2 (ja) * 2009-06-24 2014-03-19 富士通株式会社 デジタルコヒーレント受信器
WO2011083573A1 (ja) 2010-01-07 2011-07-14 株式会社 東芝 動画像符号化装置及び動画像復号化装置
US8948613B2 (en) * 2010-03-17 2015-02-03 Lightlab Imaging, Inc. Intensity noise reduction methods and apparatus for interferometric sensing and imaging systems
US8508723B2 (en) 2011-02-14 2013-08-13 Optical Air Data Systems, Llc Laser wind velocimeter with multiple radiation sources
GB201114330D0 (en) 2011-08-19 2011-10-05 Michelson Diagnostics Ltd Detector circuits for interferometers
US8879051B2 (en) 2011-12-23 2014-11-04 Optical Air Data Systems, Llc High power laser doppler velocimeter with multiple amplification stages
US9026278B2 (en) 2011-12-23 2015-05-05 Optical Air Data Systems, Llc LDV system for measuring wind at high altitude
US8961181B2 (en) 2011-12-23 2015-02-24 Optical Air Data Systems, Llc LDV system for improving the aim of a shooter
US9106334B2 (en) * 2013-05-16 2015-08-11 Exfo Inc. Method and system for common-mode-rejection-ratio (CMRR) characterization of an integrated coherent receiver
US9337937B2 (en) * 2014-03-10 2016-05-10 Cisco Technology, Inc. Common mode rejection ratio control for coherent optical receivers
CN107395289A (zh) * 2017-08-03 2017-11-24 电子科技大学 一种用于补偿多路输出相干接收机输出强度不平衡的方法
FR3096199A1 (fr) * 2019-06-21 2020-11-20 Orange Détection cohérente avec oscillateur local optimisé
WO2020254080A1 (fr) * 2019-06-21 2020-12-24 Orange Detection coherente avec oscillateur local optimise
WO2024110428A1 (en) * 2022-11-21 2024-05-30 Imec Vzw Optical balanced homodyne receiver

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191047A (en) * 1961-09-28 1965-06-22 Hewlett Packard Co Optical maser heterodyning using photoresponsive detectors
US3214590A (en) * 1962-06-28 1965-10-26 Bell Telephone Labor Inc Communication receiver utilizing negative feedback polarization modulation of electromagnetic waves and communication system including said receiver
US3571597A (en) * 1969-10-14 1971-03-23 Commerce Usa System for phase stabilizing widely separated oscillators
US3971930A (en) * 1974-04-24 1976-07-27 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Polarization compensator for optical communications
JPS56150734A (en) * 1980-04-23 1981-11-21 Nippon Telegr & Teleph Corp <Ntt> Heterodyne receiver for optical communication using semiconductor laser
FR2515903A1 (fr) * 1981-11-05 1983-05-06 Telecommunications Sa Circuit hybride adaptatif
JPS58149025A (ja) * 1982-03-02 1983-09-05 Nec Corp 光ヘテロダイン・ホモダイン検波装置
GB2121636B (en) * 1982-05-20 1986-03-05 Standard Telephones Cables Ltd Coherent optical receiver
JPS59165538A (ja) * 1983-03-10 1984-09-18 Nec Corp 光検波受信装置

Also Published As

Publication number Publication date
GB2172164B (en) 1989-02-22
ES552764A0 (es) 1987-07-01
GB2172164A (en) 1986-09-10
ES8707041A1 (es) 1987-07-01
US4718121A (en) 1988-01-05
EP0194786A2 (en) 1986-09-17
EP0194786A3 (en) 1988-09-14
EP0194786B1 (en) 1991-09-18
CN86100077A (zh) 1986-11-05
JPS61208327A (ja) 1986-09-16
DE3681473D1 (de) 1991-10-24
GB8505937D0 (en) 1985-04-11
AU5403586A (en) 1986-09-11
AU588283B2 (en) 1989-09-14

Similar Documents

Publication Publication Date Title
CN1005235B (zh) 平衡相干接收器
US4596052A (en) Coherent optical receiver
EP0251062B1 (en) Dual balanced optical signal receiver
US9716555B2 (en) Common mode rejection ratio control for coherent optical receivers
US6604871B2 (en) Method and apparatus for compensating for polarization mode dispersion (PMD) using a Mach-Zender interferometer
JPH07177088A (ja) 偏波分散補償方法
CA1293997C (en) Polarization insensitive optical communication device utilizing optical preamplification
US4723317A (en) Optical heterodyne mixers providing image-frequency rejection
JP2658180B2 (ja) 偏波ダイバーシチ光受信装置
US5995276A (en) Wavelength-division-multiplexing optical amplifier device and wavelength-division-multiplexing optical transmission system
US4464630A (en) Transimpedance pre-amplifier
US4759081A (en) Optical receiver
EP0390069B1 (en) Polarization diversity heterodyne receiver of a baseband combining type in which i.f. signals are adjusted by negative feedback from a device output signal
JPS63135829A (ja) 光学ヘテロダイン検波器
CN115728723A (zh) 平衡探测器及调频连续波雷达
JPH07281229A (ja) 光偏波制御装置
JPS60184229A (ja) 光ヘテロダイン・ホモダイン検波受信装置
EP0691757B1 (en) Optical frequency mixing apparatus
JPS6210937A (ja) 光ヘテロダイン・ホモダイン受信装置
EP0474294B1 (en) Polarization-independent receiver
JPH06252660A (ja) 光受信器
JP2000295181A (ja) 光送信器及び光通信システム
JP2658951B2 (ja) 受光回路
JPH11298411A (ja) 位相変調された光信号の検出とアラインメント誤差の検出方法およびその装置
JPH0716174B2 (ja) 光ヘテロダイン・ホモダイン検波装置

Legal Events

Date Code Title Description
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C13 Decision
GR02 Examined patent application
C14 Grant of patent or utility model
GR01 Patent grant
C53 Correction of patent of invention or patent application
COR Change of bibliographic data

Free format text: CORRECT: APPLICANT; FROM: INTERNATIONAL STANDARD ELECTRIC CORPORATION (ISEC) TO: NORTHERN TELECOM LTD.

CP03 Change of name, title or address

Address after: Quebec, Canada

Applicant after: NORTHERN TELECOM LTD.

Address before: American New York

Applicant before: ITT Corp.

C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee