公开(公告)号：US06735259B1

公开(公告)日：2004-05-11

申请号：US09466664

申请日：1999-12-20

申请人： Kim B. Roberts ,  Wolfgang Oberhammer

发明人： Kim B. Roberts ,  Wolfgang Oberhammer

IPC分类号： H03K900

CPC分类号： H04L7/0337 ,  H04L7/043 ,  H04L25/063

摘要： A method and apparatus for using sacrificial bits in a data stream to adjust sampling parameters for the data stream is described. The sacrificial bits are a predetermined sequence of a predetermined length. The sampling parameters are perturbed during transmission or reception of the sacrificial bits in order to provide information useful in adjusting the sampling parameters of the apparatus. Adjustment is accomplished by computing a bit error rate during the perturbing of sampling parameters in order to probe edges of an eye closure of the detected signal. The advantage is faster homing on optimal sampling parameters with little sacrifice of transmission capacity.

摘要翻译： 描述了一种在数据流中使用牺牲位来调整数据流的采样参数的方法和装置。 牺牲位是预定长度的预定序列。 在牺牲位的发送或接收期间，采样参数受到扰动，以便提供有助于调整装置的采样参数的信息。 通过在采样参数的扰动期间计算误码率来完成调整，以探测检测信号的眼睛闭合的边缘。 优点是在最佳采样参数下更快地归位传输容量。

公开(公告)号：US06654411B1

公开(公告)日：2003-11-25

申请号：US09472912

申请日：1999-12-27

申请人： Kim B. Roberts ,  Wolfgang W. Oberhammer

发明人： Kim B. Roberts ,  Wolfgang W. Oberhammer

IPC分类号： H04B1700

CPC分类号： H04L1/20 ,  H04L1/0083

摘要： At a transmitter, a measurement array is constructed from various combinations of frame bits, including at least one combination Which includes many frame bits and at least one combination which includes only a few frame bits. The measurement array is transmitted along with the frame bits. Upon receipt of the frame at a receiver, a parity check is performed on the received frame bits and on the measurement array, resulting in the creation of a symptomatic array. The symptomatic array can be accumulated during the course of successive frames. After a sufficiently high number of frames, it will become clear from the values of the elements in the accumulated symptomatic array which bits in the symptomatic array are saturated and which are not. The accumulated symptomatic array is then mapped to a BER estimate.

摘要翻译： 在发射机处，测量阵列由帧比特的各种组合构成，包括至少一个组合，其包括许多帧比特和至少一个仅包含几个比特的组合。 测量阵列与帧位一起传输。 在接收机接收到帧时，对接收到的帧比特和测量阵列执行奇偶校验，导致产生有症状的阵列。 有序阵列可以在连续帧过程中累积。 在足够高数量的帧之后，从累积的症状阵列中的元素的值中可以清楚，症状阵列中的哪些位是饱和的，哪些不是。 累积的症状阵列然后映射到BER估计。

公开(公告)号：US06473214B1

公开(公告)日：2002-10-29

申请号：US09283213

申请日：1999-04-01

申请人： Kim B. Roberts ,  Maurice S. O'Sullivan ,  Richard R. Habel

发明人： Kim B. Roberts ,  Maurice S. O'Sullivan ,  Richard R. Habel

IPC分类号： H04B1004

CPC分类号： H04L5/06 ,  H04L25/497 ,  H04L27/02

摘要： A binary signal is encoded to produce a three-level encoded signal having reduced bandwidth and small low frequency and d.c. components, e.g. using modified duobinary encoding, the encoded signal directly modulating a semiconductor laser to produce a frequency modulated optical signal, which is passed through an interference filter to provide two-state amplitude modulation from the three-state frequency modulation for direct recovery of the binary signal by an optical receiver, the interference filter providing constructive and destructive interference for frequencies corresponding to binary one and zero bits respectively. An array transmission system can be provided by combining multiple such frequency modulated optical signals, from multiple lasers with respective central frequencies and respective encoders for multiple binary signals, using an array waveguide which also serves as a channel frequency filter, with a single interference filter. Polarization modulation instead of frequency modulation, and external modulation of an optical signal from an optical source, are also described.

摘要翻译： 二进制信号被编码以产生具有减小的带宽和小的低频和直流的三电平编码信号。 组分，例如 使用修改的二进制编码，编码信号直接调制半导体激光器以产生调频光信号，该信号通过干涉滤波器从三态调制提供双态幅度调制，以通过以下方式直接恢复二进制信号： 光接收机，干扰滤波器分别为对应于二进制1和零位的频率提供建设性和相消干扰。 可以通过使用具有单个干涉滤波器的阵列波导来组合来自具有各自中心频率的多个激光器和多个二进制信号的相应编码器的多个这种频率调制光信号来提供阵列传输系统。 还描述了偏振调制而不是频率调制，以及来自光源的光信号的外部调制。

公开(公告)号：US5513029A

公开(公告)日：1996-04-30

申请号：US261350

申请日：1994-06-16

申请人： Kim B. Roberts

发明人： Kim B. Roberts

IPC分类号： H04B10/02 ,  H04B10/08 ,  H04J14/02 ,  H04B10/16 ,  H04B10/18

CPC分类号： H04B10/035 ,  H04B10/0777 ,  H04J14/0227 ,  H04J14/0241 ,  H04B2210/075 ,  H04B2210/077 ,  H04J14/028

摘要： In methods and apparatus for monitoring the performance of optical transmission systems, an optical signal is modulated with a low frequency dither signal to provide a modulated optical signal having a known modulation depth. A portion of the optical signal is tapped, and both a total power and a dither amplitude of the tapped portion of the optical signal are measured. Both signal and noise components of the tapped portion of the optical signal are estimated by comparing the measured dither amplitude to the measured total signal power. In wavelength division multiplexed optical transmission systems, optical signals at each distinct wavelength are modulated with distinct dither signals and dither amplitudes of each distinct dither signal detectable in the tapped portion of the optical signal are measured. Both signal and noise components are estimated for the optical signals at each distinct wavelength. The relative signal powers of optical signals at distinct wavelengths are controlled in response to the measured dither amplitudes. The methods and apparatus are particularly applicable to high capacity long haul terrestrial optical fiber transmission systems using optical amplifiers.

摘要翻译： 在用于监测光传输系统的性能的方法和装置中，用低频抖动信号调制光信号，以提供具有已知调制深度的调制光信号。 光信号的一部分被抽头，并且测量光信号的抽头部分的总功率和抖动振幅。 通过将所测量的抖动幅度与所测量的总信号功率进行比较来估计光信号的抽头部分的信号和噪声分量。 在波分复用光传输系统中，每个不同波长的光信号用不同的抖动信号进行调制，并且测量在光信号的抽头部分中可检测的每个不同的抖动信号的抖动幅度。 对于每个不同波长的光信号估计信号和噪声分量。 响应于测量的抖动振幅来控制不同波长的光信号的相对信号功率。 该方法和装置特别适用于使用光放大器的高容量长距离地面光纤传输系统。

公开(公告)号：US5365510A

公开(公告)日：1994-11-15

申请号：US865533

申请日：1992-04-09

申请人： David J. Nicholson ,  Donald R. Ellis ,  John B. Mills ,  Dino C. DiPerna ,  David W. Martin ,  Wang-Hsin Peng ,  Kim B. Roberts

发明人： David J. Nicholson ,  Donald R. Ellis ,  John B. Mills ,  Dino C. DiPerna ,  David W. Martin ,  Wang-Hsin Peng ,  Kim B. Roberts

IPC分类号： H04J3/08 ,  H04L1/22

CPC分类号： H04J3/085 ,  H04L1/22

摘要： A communications system is provided having SONET communications channels extending between first and second locations. The channels include pairs of forward and reverse channels for carrying traffic in normal operation between first and second locations and a protection channel for carrying traffic of one channel in the event of a fault. Each pair of forward and reverse channels is provided on a shelf at each location, the shelves having the same relative position at both locations and the protection channel is provided on a protection shelf. The protection channel includes, between the first and second locations, a forward optical link and a reverse optical link and at each of the first and second locations, a single protection loop, coupling the forward and reverse optical links, that forms the protection channel. The protection loop is used to provide, at each location, a local virtual protection loop for indicating the protection requirements and status of the respective location, and a remote virtual protection loop for indicating the protection requirements and status of the location remote from the respective location. The local protection loop is provided by inserting K1 and K2 bytes into E1 slots of STS-1 #25 and #2, respectively. The remote protection loop is provided by inserting K1 and K2 bytes into E1 slots of STS-1 #26 and #3, respectively.

摘要翻译： 提供了具有在第一和第二位置之间延伸的SONET通信信道的通信系统。 信道包括用于在第一和第二位置之间正常操作中携带业务的正向和反向信道对，以及用于在发生故障的情况下携带一个信道的业务的保护信道。 每一对正向和反向通道设置在每个位置的搁架上，在两个位置具有相同相对位置的搁板和保护通道设置在保护架上。 保护信道在第一和第二位置之间包括正向光链路和反向光链路，并且在第一和第二位置中的每一个处包括形成保护信道的单个保护环路，耦合正向和反向光链路。 保护环路用于在每个位置提供用于指示相应位置的保护要求和状态的本地虚拟保护环路，以及用于指示远离相应位置的位置的保护要求和状态的远程虚拟保护环路 。 通过将K1和K2字节分别插入到STS-1＃25和＃2的E1插槽中来提供本地保护环路。 通过将K1和K2字节分别插入到STS-1＃26和＃3的E1插槽中来提供远程保护环路。

公开(公告)号：US4995045A

公开(公告)日：1991-02-19

申请号：US473513

申请日：1990-02-01

申请人： Gregory S. Burley ,  Kim B. Roberts

发明人： Gregory S. Burley ,  Kim B. Roberts

IPC分类号： H01S5/00 ,  H01S5/042 ,  H01S5/06 ,  H01S5/0683

CPC分类号： H01S5/06832

摘要： A laser diode control circuit maintains a desired average output power of the laser diode by detecting the optical output, amplifying the detected output, and controlling a bias current of the laser diode accordingly. A pilot tone is combined with the detected output and amplified therewith, and the amplified level of the tone is detected and used to control a modulation current for the laser diode. In one described arrangement the laser diode is controlled to have a high extinction ratio with the bias current at the knee of the diode's characteristic curve, and in another arrangement a lower extinction ratio is provided with the bias current above the knee.

摘要翻译： 激光二极管控制电路通过检测光输出，放大所检测的输出和相应地控制激光二极管的偏置电流来维持激光二极管所需的平均输出功率。 导频音与检测到的输出相结合并对其进行放大，并且检测放大的音调电平并用于控制激光二极管的调制电流。 在一个描述的布置中，激光二极管被控制为具有与二极管特性曲线的拐点处的偏置电流的高消光比，并且在另一布置中，具有高于膝盖的偏置电流的较低消光比。

公开(公告)号：US10608746B2

公开(公告)日：2020-03-31

申请号：US16024980

申请日：2018-07-02

申请人： Qunbi Zhuge ,  Kevin Farley ,  Kim B. Roberts ,  Maurice O'Sullivan

发明人： Qunbi Zhuge ,  Kevin Farley ,  Kim B. Roberts ,  Maurice O'Sullivan

IPC分类号： H04B10/06 ,  H04B10/40 ,  H04B10/079 ,  H04B10/556 ,  H04B10/588 ,  H04B10/61 ,  H04L1/00 ,  H04L7/00

摘要： A digital instruction is generated regarding one or more electrical-to-optical conversion impairments induced at the transmitter of an optical communication system. The digital instruction may be used by the transmitter to reduce the impairments. Alternatively, or additionally, the digital instruction may be used by the receiver of the optical communication system to compensate for the impairments.

公开(公告)号：US08909069B2

公开(公告)日：2014-12-09

申请号：US13898874

申请日：2013-05-21

申请人： Kim B. Roberts

发明人： Kim B. Roberts

IPC分类号： H04L7/00 ,  H04B1/38 ,  H04J3/06 ,  H04B10/61 ,  H04B10/60

CPC分类号： H04L7/0075 ,  H04B10/60 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/6165 ,  H04L7/0004

摘要： A method and system for a estimating a most likely location of a periodic SYNC burst within an optical signal received through an optical communications system. A cross-correlation is calculated between a multi-bit digital signal derived from the optical signal and a known symbol sequence of the SYNC burst. The cross-correlation is processed in at least one sub-block to identify a candidate sub-block in which the SYNC burst is most likely located. The candidate sub-block is then further analyzed to estimate a location of the SYCN burst.

摘要翻译： 一种用于估计在通过光通信系统接收的光信号内的周期性SYNC突发的最可能位置的方法和系统。 在从光信号导出的多位数字信号和SYNC突发的已知符号序列之间计算互相关。 在至少一个子块中处理互相关以识别其中SYNC突发最可能位于的候选子块。 然后进一步分析候选子块以估计SYCN突发的位置。

公开(公告)号：US08463133B1

公开(公告)日：2013-06-11

申请号：US11552016

申请日：2006-10-23

申请人： Kim B. Roberts

发明人： Kim B. Roberts

IPC分类号： H04B10/00 ,  H04B14/02 ,  H04L27/06 ,  H04L7/04

CPC分类号： H04L7/0075 ,  H04B10/60 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/6165 ,  H04L7/0004

摘要： A method and system for a estimating a most likely location of a periodic SYNC burst within an optical signal received through an optical communications system. A cross-correlation is calculated between a multi-bit digital signal derived from the optical signal and a known symbol sequence of the SYNC burst. The cross-correlation is logically partitioned into sub-blocks. A candidate sub-block in which the SYCN burs is mot likely located is identified, and analysed to estimate a location of the SYNC burst.

摘要翻译： 一种用于估计在通过光通信系统接收的光信号内的周期性SYNC突发的最可能位置的方法和系统。 在从光信号导出的多位数字信号和SYNC突发的已知符号序列之间计算互相关。 互相关在逻辑上划分为子块。 确定SYCN毛刺可能位于其中的候选子块，并进行分析以估计SYNC突发的位置。

公开(公告)号：US08452186B2

公开(公告)日：2013-05-28

申请号：US13288375

申请日：2011-11-03

申请人： Han Sun ,  Kuang Tsan Wu ,  Kim B. Roberts

发明人： Han Sun ,  Kuang Tsan Wu ,  Kim B. Roberts

IPC分类号： H04B10/00

CPC分类号： H03L7/0812 ,  H04B10/695 ,  H04L7/0087 ,  H04L7/0278

摘要： In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal. A channel delay is estimated based on the computed compensation vectors. The estimated channel delay is subtracted from the computed compensation vectors to generate corresponding modified compensation vectors. Finally, the modified compensation vectors are used to derive a recovered clock signal.

摘要翻译： 在光通信网络的相干光接收机中，从通过光链路接收的高速光信号中恢复时钟信号的方法。 自适应地计算一组补偿矢量，用于补偿因至少光学信号的偏振损伤而引起的符号间干扰（ISI）。 基于所计算的补偿向量来估计信道延迟。 从所计算的补偿向量中减去估计的信道延迟，以产生相应的修改的补偿向量。 最后，修正的补偿向量用于导出恢复的时钟信号。