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129 条记录 (耗时 0.029 秒)

    Laser control circuit
    71.
    发明授权
    Laser control circuit 失效
    激光控制电路

    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。

    Communications with conditional chain decoding
    73.
    发明授权
    Communications with conditional chain decoding 有权

    公开(公告)号：US10484131B2

    公开(公告)日：2019-11-19

    申请号：US15841988

    申请日：2017-12-14

    申请人： Shahab Oveis Gharan ,  Mohammad Ehsan Seifi ,  Masoud Ebrahimi Tazeh Mahalleh ,  Kim B. Roberts

    发明人： Shahab Oveis Gharan ,  Mohammad Ehsan Seifi ,  Masoud Ebrahimi Tazeh Mahalleh ,  Kim B. Roberts

    IPC分类号： H04L1/00 ,  H04L27/36 ,  H04L27/00

    摘要： Client data bits, including first client data bits and second client data bits, are communicated from a transmitter to a receiver. At the transmitter, the first client data bits are processed to generate processed values, where each processed value is more likely to be a first element than a second element. Forward Error Correction ‘FEC’ encoding is applied to the second client data bits to generate FEC-encoded values. Symbols are created by mapping the FEC-encoded values to first positions in the symbols and by mapping the processed values to second positions in the symbols. The symbols are modulated onto a communications channel using a modulation scheme with a code that assigns a lower average energy to symbols containing the first elements in the second positions than to symbols containing the second elements in the second positions. At the receiver, client data bits are decoded using conditional chain decoding.

    Digital-to-analog converter and generation of high-bandwidth analog signals
    74.
    发明授权
    Digital-to-analog converter and generation of high-bandwidth analog signals 有权

    公开(公告)号：US10374623B1

    公开(公告)日：2019-08-06

    申请号：US16004673

    申请日：2018-06-11

    申请人： Shahab Oveis Gharan ,  Yuriy Greshishchev ,  Naim Ben-Hamida ,  Kim B. Roberts

    发明人： Shahab Oveis Gharan ,  Yuriy Greshishchev ,  Naim Ben-Hamida ,  Kim B. Roberts

    IPC分类号： H04B10/532 ,  H03M1/08 ,  H04Q11/00

    摘要： A controlled switch having N inputs and a single output (N≥2) is switchable between N states. In each state a respective one of the inputs is connected to the single output. There are N sources of sub-streams of analog samples, each sub-stream composed of pairs of adjacent analog samples. Each source is coupled to a respective one of the inputs. In operation, the controlled switch is controlled by a control signal to switch between the N states. While the controlled switch is in any one of the states, a data transition occurs between two adjacent analog samples in the sub-stream whose source is coupled to the input that is connected to the single output. The single output yields the high-bandwidth analog signal. Any pair of adjacent analog samples in any one of the sub-streams substantially determines a corresponding pair of adjacent analog samples in the high-bandwidth analog signal.

    Signal framing in a coherent optical receiver
    77.
    发明授权
    Signal framing in a coherent optical receiver 有权
    相干光接收机中的信号成帧

    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。

    Signal framing in a coherent optical receiver
    78.
    发明授权
    Signal framing in a coherent optical receiver 有权
    相干光接收机中的信号成帧

    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。

    Clock recovery with channel coefficients
    79.
    发明授权
    Clock recovery with channel coefficients 有权
    时钟恢复与通道系数

    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。

    Protected light source for multiple wavelength division multiplexed passive optical networks (WDM-PONs)
    80.
    发明授权
    Protected light source for multiple wavelength division multiplexed passive optical networks (WDM-PONs) 失效
    多波长复用无源光网络（WDM-PON）的保护光源

    公开(公告)号：US08340524B2

    公开(公告)日：2012-12-25

    申请号：US13434365

    申请日：2012-03-29

    申请人： Richard Habel ,  Kim B. Roberts

    发明人： Richard Habel ,  Kim B. Roberts

    IPC分类号： H04J14/02

    CPC分类号： H04J14/0282 ,  H04B10/506 ,  H04J14/0297

    摘要： A protected light source for generating seed light for at least two wavelength division multiplexed passive optical networks (WDM-PONs). The protected light source includes an optical coupler having N≧2 input ports and M≧2 output ports, each output port being optically connected to supply seed light to a respective set of one or more WDM-PONs. A respective multi-wavelength light source (MWLS) is optically coupled to supply seed light to each input port of the optical coupler. A controller unit controls operation of each multi-wavelength light source (MWLS).

    摘要翻译： 用于为至少两个波分复用无源光网络（WDM-PON）产生种子光的受保护光源。 受保护的光源包括具有N≥2个输入端口和M≥2个输出端口的光耦合器，每个输出端口被光学连接以将种子光提供给一组或多个WDM-PON。 相应的多波长光源（MWLS）被光耦合以将光源提供给光耦合器的每个输入端口。 控制器单元控制每个多波长光源（MWLS）的操作。