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    EQUALISER FOR AN OPTICAL TRANSMISSION SYSTEM
    4.
    发明授权
    EQUALISER FOR AN OPTICAL TRANSMISSION SYSTEM 有权
    用于光传输系统的均衡器

    公开(公告)号：EP2399353B1

    公开(公告)日：2017-04-26

    申请号：EP09779084.4

    申请日：2009-02-20

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： SECONDINI, Marco ,  FORESTIERI, Enrico

    IPC分类号： H04B10/69 ,  H04L25/03

    CPC分类号： H04B10/6971 ,  H04L25/03133

    摘要： An equalizer (60) processes, in the electrical domain, a signal obtained from a path of an optical transmission system. The equalizer comprises N cascaded stages (where N≧1). At least one of the stages comprises a cascade of a linear equalization element (61) and a non-linear equalization element (62). The equalizer (60) is able to compensate for both linear impairments, such as dispersion, and non-linear impairments. The cascaded linear and non-linear elements can simulate the effect of signal propagation through a fiber which has the opposite propagation parameters (e.g. attenuation, dispersion, non-linearity) to those of the propagation path experienced by a signal in the transmission system. The non-linear equalization element (62) can be a non-linear phase rotator which rotates phase of an input signal proportional to the squared modulus of the input signal amplitude. The linear equalization element (61) can comprise a digital filter, such as an Infinite Impulse Response (HR) filter or a Finite Impulse Response (FIR) filter.

    摘要翻译： 均衡器（60）在电域中处理从光传输系统的路径获得的信号。 均衡器包括N个级联级（其中N≥1）。 至少一个级包括级联的线性均衡元件（61）和非线性均衡元件（62）。 均衡器（60）能够补偿线性损伤，例如色散和非线性损伤。 级联的线性和非线性元件可以模拟通过具有与传输系统中的信号所经历的传播路径相反的传播参数（例如衰减，色散，非线性）的光纤的信号传播的效果。 非线性均衡元件（62）可以是非线性相位旋转器，其旋转与输入信号幅度的平方模量成比例的输入信号的相位。 线性均衡元件（61）可以包括数字滤波器，诸如无限脉冲响应（HR）滤波器或有限脉冲响应（FIR）滤波器。

    DIGITAL SIGNAL PROCESSING OF AN OPTICAL COMMUNICATIONS SIGNAL IN A COHERENT OPTICAL RECEIVER
    10.
    发明公开
    DIGITAL SIGNAL PROCESSING OF AN OPTICAL COMMUNICATIONS SIGNAL IN A COHERENT OPTICAL RECEIVER 审中-公开
    相干光接收机中光通信信号的数字信号处理

    公开(公告)号：EP3219062A1

    公开(公告)日：2017-09-20

    申请号：EP15703569.2

    申请日：2015-02-09

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： CAVALIERE, Fabio ,  SECONDINI, Marco

    IPC分类号： H04L25/03 ,  H04B10/61

    CPC分类号： H04B10/616 ,  G02F2/002 ,  H04B10/6165 ,  H04B10/64 ,  H04J14/02 ,  H04L25/03178 ,  H04L2025/03675 ,  H04Q2011/0011

    摘要： A digital signal processing, DSP, unit (10) for use in a coherent optical receiver for an optical communications network. The DSP unit comprises an adaptive equaliser (12) and a processing block (22). The equaliser (12) comprises input ports for receiving electrical signals, each corresponding to a different state of polarization of an optical signal received by the coherent optical receiver,and output ports,each connected to a processing branch (14). A processing branch comprises a symbol sequence estimator, SSE, (16) and a carrier phase estimator, CPE, (18) comprising an input for receiving signal taped from an output of the processing branch. An output of the CPE is connected to a phase adjuster (20) interconnecting the respective output port of the equaliser and the SSE. The processing block (22) is connected to an output of the CPE,an output of the processing branch and at least one of the output of the phase adjuster and the outputs of the equalizer.

    摘要翻译： 数字信号处理DSP单元（10），用于光通信网络的相干光接收机。 DSP单元包括自适应均衡器（12）和处理块（22）。 均衡器（12）包括用于接收电信号的输入端口，每个输入端口对应于由相干光接收器接收的光信号的不同极化状态，以及输出端口，每个输出端口连接到处理分支（14）。 处理分支包括符号序列估计器SSE（16）和包括用于接收从处理分支的输出端录制的信号的输入端的载波相位估计器CPE（18）。 CPE的输出连接到互连均衡器和SSE的相应输出端口的相位调整器（20）。 处理块（22）连接到CPE的输出端，处理分支的输出端以及相位调整器的输出端和均衡器的输出端中的至少一个。