公开(公告)号：EP0438237A3

公开(公告)日：1992-09-30

申请号：EP91300206.9

申请日：1991-01-11

申请人： SPERRY MARINE INC.

发明人： Gerdt, David W.

IPC分类号： H04J14/08 ,  G01D5/26

CPC分类号： H04J14/08 ,  H04J14/002

摘要： The pulsed input light source (15) of the fiber-optic sensor array (11,12,13,14) is divided into a plurality of input light sources for the respective sensors of the array by a network of low-loss single mode fixed ratio fiber-optic couplers (17,20,21). The input light (15) is applied to the input fiber (16) of a first fixed ratio coupler (17), the output fibers (18,19) thereof providing the input fibers of further fixed ratio couplers (20) and so forth until the light is divided into the appropriate number of sources. The divided light sources are applied to the input fibers of the variable ratio fiber-optic coupler sensors (11,12,13,14) of the array through differing lengths of optical fiber so that the input light pulses impinge upon the sensors of the array at different times. The output fibers (25,28,32,34) of the sensors (11,12,13,14) are coupled to multimode busses (26,27) through low-loss taps (29,31,33,35). In an alternative embodiment (Figure 2) for highly unbalanced ratio fiber-optic coupler sensors (51,52,53), the pulsed input light (52) is applied to the input fiber (55) of a first sensor (51). The high percentage output leg (56) of the first sensor (51) provides the input to a second sensor (52) of the array, the high percentage output fiber (60) thereof providing the input to the next array sensor (53). The low percentage legs of the sensors (57,61), which carry the information, are tapped (59,62) into a multimode fiber-optic bus (58).

摘要翻译： 光纤传感器阵列（11,12,13,14）的脉冲输入光源（15）通过低损耗单模固定网络被分成用于阵列的各个传感器的多个输入光源 光纤耦合器（17,20,21）。 输入光（15）被施加到第一固定比率耦合器（17）的输入光纤（16），其输出光纤（18,19）提供进一步固定比率耦合器（20）的输入光纤等等，直到 灯光分为适当数量的光源。 通过不同长度的光纤将划分的光源施加到阵列的可变比率光纤耦合器传感器（11,12,13,14）的输入光纤，使得输入光脉冲撞击阵列的传感器 在不同的时间。 传感器（11,12,13,14）的输出光纤（25,28,32,34）通过低损耗抽头（29,31,33,35）耦合到多模总线（26,27）。 在用于高度不平衡比的光纤耦合器传感器（51,52,53）的替代实施例（图2）中，脉冲输入光（52）被施加到第一传感器（51）的输入光纤（55）。 第一传感器（51）的高百分比输出腿（56）将输入提供给阵列的第二传感器（52），其高百分比输出光纤（60）将输入提供给下一阵列传感器（53）。 携带信息的传感器（57,61）的低百分比腿被分配（59,62）到多模光纤总线（58）中。

公开(公告)号：EP0500452A1

公开(公告)日：1992-08-26

申请号：EP92400427.8

申请日：1992-02-18

申请人： FRANCE TELECOM

发明人： Guignard, Philippe ,  Hamel, André

IPC分类号： H04B10/14 ,  H04B10/20

CPC分类号： H04B10/516 ,  H04J14/002

摘要： Réseau de communication optique comprenant plusieurs stations (S1, S2, S3, S4) comportant chacune un émetteur d'informations (E1, E2, E3, E4) et un récepteur d'informations (R1, R2, R3, R4), les stations étant reliées entre elles par des supports de transmission de signaux optiques (22, 24) et des moyens (26) de gestion du réseau, chaque station comprenant, au niveau de l'émetteur, des moyens de codage des informations (10, 12, 14) par modulation d'un retard optique, un retard optique modulé comportant un retard principal fixe et un retard variable de modulation petit devant le retard principal fixe, et au niveau du récepteur des moyens de décodage des informations (16, 18, 20) par démodulation d'un retard optique.
Application aux réseaux de communication privés.

摘要翻译： 光通信网络包括几个站（S1，S2，S3，S4），每个站包括数据发射机（E1，E2，E3，E4）和数据接收机（R1，R2，R3，R4），这些站通过光信号 传输支持（22,24）和管理网络的装置（26），每个站在发射机级别包括通过调制光学延迟来对数据（10,12,14）进行编码的装置，包括固定的 主延迟和与固定主延迟相比较小的可变调制延迟，以及在接收器电平处，通过解调光学延迟来解码数据（16,18,20）。 应用于私人通信网络。

公开(公告)号：EP0438237A2

公开(公告)日：1991-07-24

申请号：EP91300206.9

申请日：1991-01-11

申请人： SPERRY MARINE INC.

发明人： Gerdt, David W.

IPC分类号： H04J14/08 ,  G01D5/26

CPC分类号： H04J14/08 ,  H04J14/002

摘要： The pulsed input light source (15) of the fiber-optic sensor array (11,12,13,14) is divided into a plurality of input light sources for the respective sensors of the array by a network of low-loss single mode fixed ratio fiber-optic couplers (17,20,21). The input light (15) is applied to the input fiber (16) of a first fixed ratio coupler (17), the output fibers (18,19) thereof providing the input fibers of further fixed ratio couplers (20) and so forth until the light is divided into the appropriate number of sources. The divided light sources are applied to the input fibers of the variable ratio fiber-optic coupler sensors (11,12,13,14) of the array through differing lengths of optical fiber so that the input light pulses impinge upon the sensors of the array at different times. The output fibers (25,28,32,34) of the sensors (11,12,13,14) are coupled to multimode busses (26,27) through low-loss taps (29,31,33,35).
In an alternative embodiment (Figure 2) for highly unbalanced ratio fiber-optic coupler sensors (51,52,53), the pulsed input light (52) is applied to the input fiber (55) of a first sensor (51). The high percentage output leg (56) of the first sensor (51) provides the input to a second sensor (52) of the array, the high percentage output fiber (60) thereof providing the input to the next array sensor (53). The low percentage legs of the sensors (57,61), which carry the information, are tapped (59,62) into a multimode fiber-optic bus (58).

摘要翻译： 光纤传感器阵列（11,12,13,14）的脉冲输入光源（15）通过低损耗单模固定网络被分成用于阵列的各个传感器的多个输入光源 光纤耦合器（17,20,21）。 输入光（15）被施加到第一固定比率耦合器（17）的输入光纤（16），其输出光纤（18,19）提供进一步固定比率耦合器（20）的输入光纤等等，直到 灯光分为适当数量的光源。 通过不同长度的光纤将划分的光源施加到阵列的可变比率光纤耦合器传感器（11,12,13,14）的输入光纤，使得输入光脉冲撞击阵列的传感器 在不同的时间。 传感器（11,12,13,14）的输出光纤（25,28,32,34）通过低损耗抽头（29,31,33,35）耦合到多模总线（26,27）。 在用于高度不平衡比的光纤耦合器传感器（51,52,53）的替代实施例（图2）中，脉冲输入光（52）被施加到第一传感器（51）的输入光纤（55）。 第一传感器（51）的高百分比输出腿（56）将输入提供给阵列的第二传感器（52），其高百分比输出光纤（60）将输入提供给下一阵列传感器（53）。 携带信息的传感器（57,61）的低百分比腿被分配（59,62）到多模光纤总线（58）中。

公开(公告)号：EP2591566B1

公开(公告)日：2018-03-14

申请号：EP11733966.3

申请日：2011-07-08

申请人： Huawei Technologies Co., Ltd.

发明人： LI, Chuandong ,  ZHANG, Zhuhong ,  ZHU, Fei ,  BAI, Yu Sheng

IPC分类号： H04B10/50 ,  H04J14/06 ,  H04L27/00 ,  H04B10/66 ,  H04B10/61 ,  H04J14/00 ,  H04B10/69

CPC分类号： H04B10/66 ,  H04B10/50 ,  H04B10/61 ,  H04B10/611 ,  H04B10/6164 ,  H04B10/69 ,  H04J14/002 ,  H04J14/06 ,  H04L27/0014

摘要： An apparatus comprising a nonlinear lookup unit (NL-LUU) configured to add a phase shift to a signal sample to compensate for pattern dependent phase distortion, and one or more first phase adjustment units coupled to NL-LUU and configured to remove from the signal sample a nonlinear phase error from the NL-LUU, wherein the signal sample corresponds to a received signal polarization component of a polarization multiplexed (PM) coherent signal in a PM coherent optical system.

公开(公告)号：EP2705622A1

公开(公告)日：2014-03-12

申请号：EP12717724.4

申请日：2012-04-27

申请人： RWTH Aachen

发明人： Witzens, Jeremy

IPC分类号： H04J14/00

CPC分类号： H04B10/6164 ,  H04B10/64 ,  H04J14/002 ,  H04J14/02

摘要： The optical data link comprises a transmitter (7] and a receiver (8] with coherent detection at the receiver (8] and more than one optical carrier frequency. The at least more than one optical carrier frequencies are generated by a frequency comb source in both the transmitter (7] and the receiver (8). wherein the frequency comb sources generate frequency combs that have frequency components and a free spectral range. The more than one optical carrier frequencies transport more than one optical channel. Either at least one frequency component or the free spectral range of the optical comb generated at the receiver (8] is locked to the comb generated at the transmitter (7] by an optical phase locked loop, or an electrical phase locked loop or a feed-forward carrier recovery generates an intermediate frequency carrier reference that is routed to more than one channel to demodulate the data.

公开(公告)号：EP2360858B1

公开(公告)日：2013-06-19

申请号：EP09830328.2

申请日：2009-11-24

申请人： Nippon Telegraph And Telephone Corporation

发明人： TSUJIMURA, Takeshi ,  TANAKA, Kuniaki ,  YOSHIDA, Koichi ,  KATAYAMA, Kazunori ,  AZUMA, Yuji ,  SHIMIZU, Masatoshi

IPC分类号： H04B10/25 ,  H04B10/2581 ,  H04B10/27

CPC分类号： H04J14/02 ,  H04B10/032 ,  H04J14/002 ,  H04J14/0221 ,  H04J14/0294 ,  H04J14/0295 ,  H04Q11/0005 ,  H04Q11/0062 ,  H04Q2011/0043 ,  H04Q2011/0081

公开(公告)号：EP2591566A1

公开(公告)日：2013-05-15

申请号：EP11733966.3

申请日：2011-07-08

申请人： Huawei Technologies Co., Ltd.

发明人： LI, Chuandong ,  ZHANG, Zhuhong ,  ZHU, Fei ,  BAI, Yu Sheng

IPC分类号： H04B10/148 ,  H04B10/145 ,  H04B10/158

CPC分类号： H04B10/66 ,  H04B10/50 ,  H04B10/61 ,  H04B10/611 ,  H04B10/6164 ,  H04B10/69 ,  H04J14/002 ,  H04J14/06 ,  H04L27/0014

摘要： An apparatus comprising a nonlinear lookup unit (NL-LUU) configured to add a phase shift to a signal sample to compensate for pattern dependent phase distortion, and one or more first phase adjustment units coupled to NL-LUU and configured to remove from the signal sample a nonlinear phase error from the NL-LUU, wherein the signal sample corresponds to a received signal polarization component of a polarization multiplexed (PM) coherent signal in a PM coherent optical system.

摘要翻译： 包括被配置以添加相移的信号样本非线性查找单元（NL-LUU）的装置，以补偿图案相关的相位失真，和一个或多个第一相位调整单元耦合到NL-LUU和配置以从所述信号中去除 采样从NL-LUU，worin信号样本对应于复用（PM）在一个相干光学系统PM相干信号的偏振的一个接收到的信号的偏振分量非线性相位误差。

公开(公告)号：EP2506478A1

公开(公告)日：2012-10-03

申请号：EP11305334.2

申请日：2011-03-25

申请人： Alcatel Lucent

发明人： Rival, Olivier ,  Vacondio, Francesco

IPC分类号： H04J14/06 ,  H04J14/00

CPC分类号： H04J14/06 ,  H04B10/532 ,  H04B10/614 ,  H04J14/002

摘要： Proposed is a method of optical data transmission. The method comprises different steps. A first optical signal and a second optical signal are generated, such that the optical signals possess a same wavelength, respective phases, which are modulated in dependence on respective data values, and respective polarization states, which are essentially orthogonal to each other. A combined optical signal is generated, by combining the optical signals, such that the combined optical signal possesses a polarization state with a predetermined variation. The combined optical signal is transmitter over an optical transmission line and received. Two time-discrete sampled signals are generated, by sampling the received optical signal along two orthogonal polarization planes. Two filtered signals are generated, by filtering the time-discrete sampled signals in the time-discrete domain, using a function that is indicative of the respective predetermined variation. Finally, respective data values are derived from the filtered signals.

摘要翻译： 提出了一种光数据传输的方法。 该方法包括不同的步骤。 产生第一光信号和第二光信号，使得光信号具有相同的波长，根据相应的数据值调制的各个相位以及基本上彼此正交的相应极化状态。 通过组合光信号来生成组合的光信号，使得组合光信号具有预定变化的偏振状态。 组合的光信号是通过光传输线路发送并接收的。 通过沿两个正交极化平面对接收的光信号进行采样来产生两个时间离散采样信号。 通过使用指示相应的预定变化的函数对时间离散域中的时间离散采样信号进行滤波来产生两个滤波信号。 最后，从滤波后的信号导出相应的数据值。

公开(公告)号：EP2362557A1

公开(公告)日：2011-08-31

申请号：EP10290092.5

申请日：2010-02-24

申请人： Alcatel Lucent

发明人： Charlet, Gabriel ,  Bertran Pardo, Oriol ,  Renaudier, Jérémie ,  Vacondio, Francesco

IPC分类号： H04B10/148 ,  H04B10/18 ,  H04J14/06 ,  H04B10/158

CPC分类号： H04B10/61 ,  H04B10/611 ,  H04B10/614 ,  H04B10/6161 ,  H04B10/6162 ,  H04B2210/252 ,  H04J14/002

摘要： The present document relates to optical communication systems. In particular, the present document relates to coherent optical receivers using MLSE techniques. A detection unit to detect a symbol from a received digital signal is described, wherein the digital signal has been derived from an optical signal transmitted over an optical transmission channel and wherein the digital signal has been submitted to low pass filtering. The detection unit comprises a filter determination unit configured to determine a first plurality of filter coefficients of a digital filter based on the digital signal; a filter conversion unit configured to determine a second plurality of filter coefficients from the first plurality of filter coefficients such that a digital filter configured with the second plurality of filter coefficients is essentially an all pass filter; a filter unit configured to filter the digital signal using the digital filter configured with the second plurality of coefficients; and a maximum likelihood sequence detector, referred to as MLSE detector, configured to detect the symbol from the filtered digital signal at a given time instant, while taking into account one or more symbols of one or more previous time instants.

摘要翻译： 本文件涉及光通信系统。 特别地，本文件涉及使用MLSE技术的相干光接收机。 描述了从接收的数字信号中检测符号的检测单元，其中数字信号已经从通过光传输信道传输的光信号导出，并且其中数字信号已被提交到低通滤波。 检测单元包括：滤波器确定单元，被配置为基于数字信号确定数字滤波器的第一多个滤波器系数; 滤波器转换单元，被配置为从所述第一多个滤波器系数确定第二多个滤波器系数，使得配置有所述第二多个滤波器系数的数字滤波器基本上是全通滤波器; 滤波器单元，被配置为使用配置有第二多个系数的数字滤波器对数字信号进行滤波; 以及被称为MLSE检测器的最大似然序列检测器，被配置为在给定的时刻从经滤波的数字信号中检测符号，同时考虑一个或多个先前时刻的一个或多个符号。

公开(公告)号：EP0191588A3

公开(公告)日：1990-09-19

申请号：EP86300751.4

申请日：1986-02-05

申请人： THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY

发明人： Brooks, Janet L. ,  Tur, Moshe ,  Youngquist, Robert C. ,  Kim, Byoung Yoon ,  Wentworth, Robert H. ,  Shaw, Herbert John ,  Blotekjaer, Kjell

IPC分类号： G01D5/26

CPC分类号： G01D5/35383 ,  G02B6/14 ,  G02B6/2821 ,  G02B6/2826 ,  G02B6/283 ,  G02B6/2843 ,  G02B6/2861 ,  H04J14/002

摘要： A distributed sensor system including an optical source (100) having a short coherence length for optionally continuously monitoring each sensor in the system. In one preferred embodiment, an array of fiber-optic sensors (110) are organized in a ladder configuration, with the sensors positioned in spaced relation and defining the rungs of the ladder. Light transmitted through the sensors is multiplexed onto a return arm (114) of the ladder, with sensor spacing being such that interference between light from different sensors is prevented. The multiplexed signals are received by an optical fiber receiver (118, 120) which couples the mutiplexed light with an interfering optical reference signal to produce a phase difference signal representing conditions influencing selected sensors. Embodiments are disclosed for use of either pulsed or continuous wave light sources. In another preferred embodiment, the sensors comprise a plurality of interferometers (404,406) connected in series configuration by a common optical fiber (402), which provides multiplexed output signals from the sensors to another plurality of interferometers (418, 420) comprising receivers. Functional equivalents of the series configuration provide sensors and receivers comprising birefringent or two-mode fiber. The optical path length differences between each pair of sensor arms (409, 410, 411 and 412) are selected to prevent interference between the multiplexed sensor output signals from the various sensors. The optical path lengths through the sensors (404, 406) and receivers (418, 420) are structured so that each receiver (418, 420) produces a phase difference signal relating to conditions affecting light transmission through a specific sensor (404, 406). A phase and amplitude modulation technique is disclosed for providing heterodyned output signals from the dristributed sensor system.