公开(公告)号：US4977620A

公开(公告)日：1990-12-11

申请号：US2663

申请日：1987-01-05

Applicant: David W. Smith ,  David Cotter ,  Richard Wyatt

Inventor： David W. Smith ,  David Cotter ,  Richard Wyatt

IPC: G02F2/00 ,  G02F1/35 ,  H01S3/06 ,  H01S3/30 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/148 ,  H04B10/152

CPC classification number: H04B10/61 ,  G02F2/002 ,  H04B10/63

Abstract: An optical homodyne detection system employs the phenomenon of stimulated Brillouin scattering to amplify the carrier component of an incoming coherent modulated optical wave. The composite wave formed of the amplified carrier component and unamplified information component is locked in phase, frequency and polarization with the incoming modulated wave. Using this composite wave, a homodyne detection system is formed to detect the data in the information component.

Abstract translation: PCT No.PCT / GB86 / 00252 Sec。 371日期1987年1月5日 102（e）日期1987年1月5日PCT申请日1986年5月9日PCT公布。 出版物WO86 / 06849 日期：1986年11月20日。光学零差检测系统采用受激布里渊散射的现象来放大输入相干调制光波的载波分量。 由放大的载波分量和未放大的信息分量形成的复合波与输入的调制波锁相在相位，频率和极化中。 使用该复合波，形成零差检测系统以检测信息分量中的数据。

公开(公告)号：US4898443A

公开(公告)日：1990-02-06

申请号：US289396

申请日：1988-12-19

Applicant: Richard E. Epworth ,  Stephen Wright ,  Terry Bricheno

Inventor： Richard E. Epworth ,  Stephen Wright ,  Terry Bricheno

IPC: G02B6/293 ,  H04B10/148

CPC classification number: H04B10/60

Abstract: A non-circularly-symmetric intensity distribution is formed on a quadrant photodetector by coherently mixing two optical signals propagating in selected modes of different order. These modes are chosen either such that a change in relative phase of the two signals produces solely a rotation of the orientation of that intensity distribution, or such that a change in relative states of polarization produces this rotation.

Abstract translation: 通过相干地混合以不同顺序的选定模式传播的两个光信号，在象限光电检测器上形成非圆形对称强度分布。 这些模式被选择为使得两个信号的相对相位的变化仅产生该强度分布的取向的旋转，或者使得相对极化状态的变化产生该旋转。

公开(公告)号：US4732447A

公开(公告)日：1988-03-22

申请号：US842105

申请日：1986-03-20

Applicant: Stephen Wright ,  Anthony W. Davis

Inventor： Stephen Wright ,  Anthony W. Davis

IPC: H04B10/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/148 ,  H04B10/152 ,  G02B6/28

CPC classification number: H04B10/61 ,  H04B10/612 ,  H04B10/63

Abstract: A receiver for modulated optical signals including a multiport optical fibre coupler arrangement (10) to one input port of which the modulated optical signals are applied and to another input port of which a local oscillator optical signal of substantially the same optical frequency as the modulated optical signal is applied whereby the output ports of the coupler give separate output signals that are differentially related to the optical frequency phase difference between the modulated input signal and the local oscillator signal, means for individually demodulating (12a-12c) the output signals and means for summing the demodulated output signals.

Abstract translation: 一种用于调制光信号的接收机，包括多端口光纤耦合器装置（10）到被调制的光信号的一个输入端口，并且其另一个输入端口具有与调制光学器件基本相同的光频率的本地振荡器光信号 施加信号，由此耦合器的输出端口给出与调制输入信号和本地振荡器信号之间的光频率相位差有差异的分离的输出信号，用于单独解调（12a-12c）输出信号的装置和用于 解调后的输出信号相加。

公开(公告)号：US4723316A

公开(公告)日：1988-02-02

申请号：US860823

申请日：1986-05-08

Applicant: Bernard Glance

Inventor： Bernard Glance

IPC: G02F2/00 ,  H04B10/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/148 ,  H04B10/152 ,  H04B9/00

CPC classification number: H04B10/61 ,  H04B10/614 ,  H04B10/64

Abstract: The present invention relates to coherent optical heterodyning receivers which mix a received optical signal, including an arbitrary polarization state, and a local oscillator signal, including a fixed polarization state, while providing a performance which is independent of the polarization direction of a received signal. In one receiver version, the received signal is heterodyned using only a portion of the local oscillator signal, while in a second receiver version, the entire local oscillator signal is used. The combined polarized signals are split in a polarizing beam splitter between the two orthogonal polarization axes for propagation in separate branches. Each branch includes a photodetector and means for processing the resulting photodetector output signal to retrieve the modulation information from the processed signal. The sum of the two demodulated signals from the two branches provides a baseband signal independent of the polarization state of the received optical signal.

Abstract translation: 本发明涉及将包括任意偏振态的接收光信号和包括固定偏振态的本地振荡器信号混合在一起的相干光外差接收机，同时提供与接收信号的偏振方向无关的性能。 在一种接收机版本中，仅使用本地振荡器信号的一部分来接收信号，而在第二接收机版本中，使用整个本地振荡器信号。 组合的偏振信号被分成两个正交偏振轴之间的偏振分束器，用于在分离的分支中传播。 每个分支包括光电检测器和用于处理所得光电检测器输出信号以从处理的信号中检索调制信息的装置。 来自两个分支的两个解调信号的总和提供独立于所接收的光信号的偏振状态的基带信号。

公开(公告)号：US4697284A

公开(公告)日：1987-09-29

申请号：US860822

申请日：1986-05-08

Applicant: Bernard Glance

Inventor： Bernard Glance

IPC: H04B10/00 ,  G01J9/04 ,  G02B27/28 ,  G02F2/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/148 ,  H04B10/152 ,  H04B9/00

CPC classification number: H04B10/60 ,  G01J9/04 ,  H04B10/614 ,  H04B10/64

Abstract: The present invention relates to a single-photodiode optical mixer for heterodyne detection of optical signals. In the present optical mixer, a received optical signal and an optical local oscillator signal, which are each polarized along one direction of a polarizing beam-splitter, are directed at a 3 dB beam-splitter. Equal portions of the received signal and local oscillator signal are directed along first and second paths by the beam-splitter for arrival at a polarizing beam-splitter. One of the paths between the two beam-splitters comprises a 90 degree polarization rotator for rotating the polarization of the signal passing therethrough by .pi./2 radians. The output from the polarizing beam-splitter comprises the signal from the first path including a first polarization direction and the signal from the second path including a second polarization direction, which two signals are detected independently by a single photodetector to generate an IF signal which is the sum of the two IF currents.

Abstract translation: 本发明涉及用于光信号外差检测的单光电二极管光混合器。 在本光学混合器中，沿着偏振光束分离器的一个方向各自偏振的接收光信号和光本地振荡器信号指向3dB分束器。 接收信号和本地振荡器信号的相等部分通过分束器沿着第一和第二路径被引导到偏振分束器。 两个光束分离器之间的路径之一包括用于旋转通过其的π/ 2弧度的信号的偏振的90度偏振旋转器。 来自偏振光束分离器的输出包括来自包括第一偏振方向的第一路径的信号和包括第二偏振方向的来自第二路径的信号，该两个信号由单个光电检测器独立地检测以产生IF信号， 两个IF电流的总和。

公开(公告)号：US4063084A

公开(公告)日：1977-12-13

申请号：US706723

申请日：1976-07-19

Applicant: Frank E. Goodwin ,  Thomas A. Nussmeier

Inventor： Frank E. Goodwin ,  Thomas A. Nussmeier

IPC: H04B10/148 ,  H04B9/00

CPC classification number: H04B10/60 ,  H04B10/614 ,  H04B10/63

Abstract: An improved homodyne receiver for use in wideband optical communications systems is disclosed. The receiver utilizes quadrature demodulation of the optical signal in the manner of a two-phase receiver. A beam-splitting/phase-splitting optical assembly is used to channelize the received and the local oscillator beams to a pair of optical detectors. Squaring amplifiers in the quadrature channels followed by a summing network provide an output signal which is proportional to the square of the modulation of the input signal. This receiver is especially well-suited to the reception of Pulse Code Modulated optical signals.

Abstract translation: 公开了一种用于宽带光通信系统的改进的零差接收机。 接收机以两相接收机的方式利用光信号的正交解调。 分束/分相光学组件用于将接收的和本地振荡器波束通道化成一对光学检测器。 正交通道中的平方放大器跟随求和网络提供与输入信号的调制的平方成比例的输出信号。 该接收器特别适用于接收脉冲编码调制光信号。

公开(公告)号：US3569996A

公开(公告)日：1971-03-09

申请号：US3569996D

申请日：1968-06-07

Applicant: BELL TELEPHONE LABOR INC

Inventor： GOELL JAMES E ,  HUBBARD WILLIAM M

IPC: G02F2/00 ,  H04B10/148 ,  H04B9/00

CPC classification number: H04B10/60 ,  G02F2/002 ,  H04B10/64

Abstract: In the optical heterodyne receivers disclosed, the overall signal-to-noise ratio is improved by widening in terms of time duration the information-modulated optical pulses so that their bandwidth is comparable to the bandwidth of the detector. In particular, multiple reflection widening techniques are disclosed. Balanced detection with pulse widening in each path is also disclosed.

公开(公告)号：US3404353A

公开(公告)日：1968-10-01

申请号：US44434165

申请日：1965-03-31

Applicant: RESEARCH CORP

Inventor： HARRIS STEPHEN E ,  BUHRER CARL F

IPC: G02F2/00 ,  H04B10/148

CPC classification number: H04B10/60 ,  G02F2/00

公开(公告)号：US3404279A

公开(公告)日：1968-10-01

申请号：US44561265

申请日：1965-04-05

Applicant: MC DONNELL DOUGLAS CORP

Inventor： MATARE HERBERT F

IPC: G02F2/00 ,  H04B10/148

CPC classification number: H04B10/60 ,  G02F2/002

公开(公告)号：US08331802B2

公开(公告)日：2012-12-11

申请号：US12801972

申请日：2010-07-06

Applicant: Akihiro Fujii

Inventor： Akihiro Fujii

IPC: H04B10/148

CPC classification number: H04B10/63 ,  H04B10/61

Abstract: In a synchronous circuit, a synchronizing signal generator combines either an optical BPSK signal or local oscillation light with a phase-shifted signal to produce different optical signals, one of which for use in producing a signal demodulated from the BPSK signal is square-law detected, and calculates the optical signal detected to convert the signal into an electric signal. The generator produces an electric phase-locking signal which will be a demodulated signal from the BPSK signal on the basis of the electric signal. The phase-locking signal is used as a modulating signal by an intensity-modulating circuit to modulate an incident continuous light into an optical intensity-modulated signal, which is optoelectrically converted and square-law detected by an optoelectric converter. The converted signal is used by an optical VCO circuit as a phase error signal to adjust the phase or frequency of the local oscillation light, which is supplied to the signal generator.

Abstract translation: 在同步电路中，同步信号发生器将光学BPSK信号或本地振荡光与相移信号组合以产生不同的光信号，其中一个用于产生从BPSK信号解调的信号是平方律检测的 ，并计算检测的光信号以将该信号转换为电信号。 发生器产生电相锁定信号，该信号将根据电信号来自BPSK信号的解调信号。 相位锁定信号由强度调制电路用作调制信号，以将入射的连续光调制成由光电转换器检测到的光电转换和平方律的光强度调制信号。 转换的信号由光VCO电路用作相位误差信号，以调节提供给信号发生器的本地振荡光的相位或频率。