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    OPTIMIZATION OF OPTICAL TRANSMISSION CAPACITY
    3.
    发明公开
    OPTIMIZATION OF OPTICAL TRANSMISSION CAPACITY 审中-公开
    OPTIMIERUNG VON OPTISCHERÜBERTRAGUNGSKAPAZITÄT

    公开(公告)号：EP3114779A1

    公开(公告)日：2017-01-11

    申请号：EP15711356.4

    申请日：2015-03-04

    申请人： Cisco Technology, Inc.

    发明人： FLUDGER, Chris ,  KUPFER, Theodor ,  FORGHIERI, Fabrizio ,  POGGIOLINI, Pierluigi ,  BOSCO, Gabriella ,  CARENA, Andrea ,  CURRI, Vittorio

    IPC分类号： H04B10/2513 ,  H04B10/516 ,  H04B10/54 ,  H04B10/61

    CPC分类号： H04L1/0042 ,  H04B10/25137 ,  H04B10/2569 ,  H04B10/5161 ,  H04B10/541 ,  H04B10/61 ,  H04B10/614 ,  H04B10/616 ,  H04J14/06

    摘要： A method for transmitting a coherent optical data signal includes receiving a data signal from an interface, and encoding the data signal with a forward error correcting (FEC) encoder according to a mix of modulation formats. The FEC encoder generates an FEC encoded signal which is used to generate modulation symbols according to the modulation formats. The FEC encoded signal of modulation symbols is spectrally shaped to generate a shaped signal, and pre-distorted before transmission. The shaped signal is pre-distorted by adding a predetermined amount of chromatic dispersion to generate a smoothed signal, and the smoothed signal is transmitted according to the modulation formats.

    摘要翻译： 用于发送相干光数据信号的方法包括从接口接收数据信号，并且根据调制格式的混合使用前向纠错（FEC）编码器对数据信号进行编码。 FEC编码器生成用于根据调制格式生成调制符号的FEC编码信号。 调制符号的FEC编码信号被频谱整形以产生成形信号，并且在传输之前被预失真。 通过添加预定量的色散以产生平滑的信号来对成形信号进行预失真，并且根据调制格式发送平滑的信号。

    PHASE DETECTION METHOD AND PHASE DETECTOR
    4.
    发明公开
    PHASE DETECTION METHOD AND PHASE DETECTOR 有权
    相判别法及相探测器

    公开(公告)号：EP2430788A1

    公开(公告)日：2012-03-21

    申请号：EP10716345.3

    申请日：2010-05-03

    申请人： Cisco Technology, Inc.

    发明人： STOJANOVIC, Nebojsa ,  KUPFER, Theodor ,  WHITEAWAY, James ,  HAUENSCHILD, Jürgen ,  GEHRKE, Sören

    IPC分类号： H04L7/033 ,  H03L7/091

    CPC分类号： H04L7/0331 ,  H03L7/0807 ,  H03L7/081 ,  H03L7/087 ,  H03L7/091 ,  H04L7/033

    摘要： This invention relates to a phase detection method. An input signal (51, 91, 111) is sampled (13, 14, 15, 16) for obtaining several samples (1, 2, 3) at different points in time which are defined by a clock (C). A phase control signal (4, 5) is obtained (17, 8, 19, 20) form said several samples (1, 2, 3). The phase control signal (4, 5) may be zero, positive or negative. The phase detection method is a rising phase detection method (52; 69; 93, 94), if a zero phase control signal (4) is produced, if a falling slope is detected, or a falling phase detection method (55; 70; 96, 97), if a zero phase control signal (5) is produced, if a rising slope is detected. The invention further relates to a corresponding rising and falling phase detectors, respectively.

    COMMON MODE REJECTION RATIO CONTROL FOR COHERENT OPTICAL RECEIVERS
    7.
    发明公开
    COMMON MODE REJECTION RATIO CONTROL FOR COHERENT OPTICAL RECEIVERS 审中-公开
    STEUERUNG DESGLEICHTAKTUNTERDRÜCKUNGSVERHÄLTNISSESFÜRKOHÄRENTEOPTISCHEEMPFÄNGER

    公开(公告)号：EP3117536A1

    公开(公告)日：2017-01-18

    申请号：EP15712466.0

    申请日：2015-03-10

    申请人： Cisco Technology, Inc.

    发明人： DUTHEL, Thomas ,  HAUENSCHILD, Juergen ,  KUPFER, Theodor

    IPC分类号： H04B10/61

    CPC分类号： H04B10/616 ,  H04B10/07955

    摘要： An optical signal is received at a coherent optical receiver. The received optical signal is converted to a first electrical signal and a second electrical signal through a first photodetector and a second photodetector, respectively. The first electrical signal is input into a first single input variable gain amplifier, and the second electrical signal is input into a second single input variable gain amplifier. A gain of at least one of the first single input variable gain amplifier or the second single input variable gain amplifier is controlled to balance the output of the first single input variable gain amplifier and the output of the second single input variable gain amplifier. The output of the first single input variable gain amplifier and the output of the second single input variable gain amplifier are input into a differential amplifier. A receiver output is obtained at an output of the differential amplifier.

    摘要翻译： 在相干光接收机处接收光信号。 所接收的光信号分别通过第一光电检测器和第二光电检测器转换成第一电信号和第二电信号。 第一电信号被输入到第一单输入可变增益放大器中，并且第二电信号被输入到第二单输入可变增益放大器中。 控制第一单输入可变增益放大器或第二单输入可变增益放大器中的至少一个的增益，以平衡第一单输入可变增益放大器的输出和第二单输入可变增益放大器的输出。 第一单输入可变增益放大器的输出和第二单输入可变增益放大器的输出被输入到差分放大器中。 在差分放大器的输出端获得接收器输出。

    CYCLE SLIP REDUCTION IN COHERENT OPTICAL COMMUNICATIONS
    9.
    发明公开
    CYCLE SLIP REDUCTION IN COHERENT OPTICAL COMMUNICATIONS 有权
    时钟跳减少在相干光通信

    公开(公告)号：EP2856669A1

    公开(公告)日：2015-04-08

    申请号：EP13725869.5

    申请日：2013-05-17

    申请人： Cisco Technology, Inc.

    发明人： GEYER, Jonas ,  BISPLINGHOFF, Andreas ,  KUPFER, Theodor

    IPC分类号： H04B10/61

    CPC分类号： H04B10/6165

    摘要： Carrier phase estimation techniques are provided for processing a received optical signal having a carrier modulated according to a modulation scheme. First and second carrier phase estimation operations are performed on a digital signal derived from an optical carrier obtained from the received optical signal using coherent optical reception. The first carrier phase estimation operation tracks relatively fast phase variations of the optical carrier of the received optical signal to produce a first carrier phase estimation and the second carrier phase estimation operation tracks relatively slow phase variations of the optical carrier of the received optical signal to produce a second carrier phase estimation. A difference between the first and second carrier phase estimations is computed. Occurrence of a cycle slip is determined when the difference is greater than a threshold. A correction is applied to the first carrier phase estimation when the low pass filtered difference exceeds the threshold.