公开(公告)号：WO2019114961A1

公开(公告)日：2019-06-20

申请号：PCT/EP2017/082714

申请日：2017-12-13

Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Inventor： CAVALIERE, Fabio ,  BOTTARI, Giulio ,  RUFFINI, Stefano

IPC: H04B10/077 ,  H04B10/2513 ,  H04J14/00

CPC classification number: H04B10/0775 ,  H04B10/2513 ,  H04J14/00

Abstract: An optical link (100) for a communication network, the optical link comprising: an optical fibre link (102); a downstream transmitter (112), a downstream receiver (114), an upstream transmitter (122) and an upstream receiver (124), wherein the upstream and downstream transmitters are configured to transmit a respective pilot tone on a respective optical carrier and are configured to tune a frequency of the pilot tone within a preselected frequency range, and wherein the upstream and downstream receivers are configured respectively to determine an upstream notch frequency, fnotch-US, and a downstream notch frequency, fnotch-DS, of respective detected photocurrents from at least one respective pilot tone frequency at which the respective detected photocurrent is equal to or lower than a photocurrent threshold; and processing circuitry (130) configured to receive the upstream and downstream notch frequencies and configured to estimate a propagation delay difference of the optical link depending on the upstream and downstream notch frequencies.

公开(公告)号：WO2019086749A1

公开(公告)日：2019-05-09

申请号：PCT/FI2017/050762

申请日：2017-11-06

Applicant: TELESTE OYJ

Inventor： MÄKI, Kari ,  KUUSISTO, Sami ,  HALEN, Sami ,  FAGERLUND, Perttu

IPC: H04B7/155 ,  H04B10/079 ,  H04B10/2513 ,  H04B10/2575 ,  H04B1/04 ,  H04N21/61

Abstract: A network element of a cable television (CATV) network, said network element comprising a distributed access node unit comprising a core network interface for receiving downstream signals; one or more amplifier units for amplifying downstream signal transmission for output into one or more output channels; a digital predistorion functionality for supplying a predistorion signal into an input of at least one of the amplifier units for correcting non-linearity of the amplifier unit, wherein a sampling signal for adjusting a level of the predistorion signal is obtained from a sampling point common with at least one other functionality of the network element requiring a sampling signal.

公开(公告)号：WO2019010439A1

公开(公告)日：2019-01-10

申请号：PCT/US2018/041123

申请日：2018-07-06

Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

Inventor： PEJKIC, Ana ,  RADIC, Stojan

IPC: H04B10/2507 ,  H04B10/2513 ,  H04B10/2563

Abstract: A system and method for ultrashort signal detection adds an optical weighting element upstream of a detector within a direct detection receiver. The optical weighting element is configured to generate an optical pulse that closely matches at least one ultrashort pulse within the input signal so that portions of the input signal that are nonoverlapping with the at least one ultrashort pulse are rejected.

公开(公告)号：WO2018094574A1

公开(公告)日：2018-05-31

申请号：PCT/CN2016/106812

申请日：2016-11-22

Applicant: 华为技术有限公司

Inventor： 张亮 ,  周杰 ,  左天健

IPC: H04B10/2513

CPC classification number: H04B10/2513

Abstract: 一种色散补偿方法及装置，用以补偿光纤通信系统中的色散。方法包括：光纤通信系统的接收端确定多个最佳相位补偿值与光纤通信系统的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；接收端生成指示信息，该指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系；接收端将生成的指示信息发送给发射端；发射端接收接收端发送的指示信息，并按照该一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿，得到第二多载波信号；发射端对第二多载波信号进行光调制，得到第一光信号；发射端将该第一光信号发送给接收端。

公开(公告)号：WO2016078569A1

公开(公告)日：2016-05-26

申请号：PCT/CN2015/094805

申请日：2015-11-17

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： ZAMANI, Mahdi ,  ZHANG, Zhuhong ,  LI, Chuandong

IPC: H04L27/227 ,  H04B10/61 ,  H04B10/2513

CPC classification number: H04B10/6161 ,  H04B10/613 ,  H04B10/614

Abstract: An apparatus comprises a front end configured to receive an optical signal, and convert the optical signal into a plurality of digital signals, and a processing unit coupled to the front end and configured to determine a best-match chromatic dispersion (CD) estimate in the optical signal by optimizing a cost function based on signal peaks of the plurality of digital signals.

Abstract translation: 一种装置包括：前端，被配置为接收光信号，并将光信号转换成多个数字信号;以及处理单元，耦合到前端并且被配置为确定所述光信号中的最佳匹配色散（CD）估计 通过基于多个数字信号的信号峰值优化成本函数来获得光信号。

公开(公告)号：WO2016050079A1

公开(公告)日：2016-04-07

申请号：PCT/CN2015/079390

申请日：2015-05-20

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： LIU, Xiang ,  EFFENBERGER, Frank

IPC: H04B10/2513

CPC classification number: H04B10/2513 ,  H04B10/2507 ,  H04B10/25137 ,  H04B10/2575 ,  H04B10/25752

Abstract: An apparatus comprising a digital signal processor (DSP) unit configured to perform fiber dispersion pre-compensation on a digital signal sequence based on a dispersion value to produce a pre-compensated signal, wherein the dispersion value is associated with a remote optical receiver, a plurality of digital-to-analog converters (DACs) coupled to the DSP unit and configured to convert the pre-compensated signal into analog electrical signals, and a frontend coupled to the DACs and configured to convert the analog electrical signals into a first optical signal, adding a constant optical electric (E) -field to the first optical signal to produce a second optical signal, and transmit the second optical signal to the remote optical receiver.

Abstract translation: 一种包括数字信号处理器（DSP）单元的装置，其被配置为基于色散值对数字信号序列执行光纤色散预补偿以产生预补偿信号，其中色散值与远程光接收器相关联， 多个数字 - 模拟转换器（DAC），其耦合到所述DSP单元并且被配置为将所述预补偿信号转换成模拟电信号，以及前端耦合到所述DAC并且被配置为将所述模拟电信号转换为第一光信号 向所述第一光信号添加恒定的光电（E）场，以产生第二光信号，并将所述第二光信号发射到所述远程光接收机。

公开(公告)号：WO2016037729A1

公开(公告)日：2016-03-17

申请号：PCT/EP2015/065666

申请日：2015-07-09

Applicant: XIEON NETWORKS S.À R.L.

Inventor： DRUMMOND, Miguel ,  SPINNLER, Bernhard ,  CALABRO, Stefano

IPC: H04B10/2507 ,  H04B10/2513 ,  H04B10/69 ,  H04J14/08

CPC classification number: H04B10/25073 ,  H04B10/25133 ,  H04B10/6971

Abstract: The present invention relates to performing chromatic dispersion estimation in a receiver of an optical communication system. Here, the signal received by the receiver includes frames, each comprising a training portion and a data portion. The training portion comprises a plurality of identical pattern sequences. Different settings are applied to an equalizer to generate a plurality of equalized signals from at least one of the received frames. Then, at least one correlation value is calculated between a first pattern sequence and a second pattern sequence of the equalized signals and a final correlation value is derived from the respective correlation values. The setting of the equalizer corresponding to the equalized signal providing the highest final correlation value is selected to provide the chromatic dispersion estimation.

Abstract translation: 本发明涉及在光通信系统的接收机中进行色散估计。 这里，由接收机接收的信号包括帧，每个帧包括训练部分和数据部分。 训练部分包括多个相同的模式序列。 对均衡器应用不同的设置以从至少一个所接收的帧产生多个均衡的信号。 然后，在均衡信号的第一图案序列和第二图案序列之间计算至少一个相关值，并从相应的相关值导出最终相关值。 选择对应于提供最高最终相关值的均衡信号的均衡器的设置以提供色散估计。

公开(公告)号：WO2016014210A1

公开(公告)日：2016-01-28

申请号：PCT/US2015/037724

申请日：2015-06-25

Applicant: ARRIS ENTERPRISES, INC.

Inventor： WANG, Jun J.

IPC: H04B10/2513 ,  H04B10/2575

CPC classification number: H04B10/58 ,  H04B10/25137 ,  H04B10/25751 ,  H04B10/503 ,  H04B10/504 ,  H04B10/516 ,  H04B10/564

Abstract: Systems and methods for using a dispersion compensation circuit to directly modulate a laser.

Abstract translation: 使用色散补偿电路直接调制激光的系统和方法。

公开(公告)号：WO2015131843A1

公开(公告)日：2015-09-11

申请号：PCT/CN2015/073723

申请日：2015-03-05

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： CHEN, Chen ,  LI, Chuandong ,  ZHANG, Zhuhong

IPC: H04B10/2513

CPC classification number: H04B10/58 ,  H04B10/2513 ,  H04B10/503 ,  H04B10/5165 ,  H04B10/564

Abstract: Embodiments are provided to improve direct detection for optical transmissions. In an embodiment, a method by a transmitter for a direct detection system includes driving, via a drive voltage, a single-side band (SSB) signal at an optical modulator on a first optical path of the transmitter. The SSB signal is sufficiently linear with respect to the drive voltage for allowing direct detection at a receiver. The method further includes generating a DC carrier signal on a second path of the transmitter. The SSB signal is combined with the DC carrier signal at an output of the transmitter.

Abstract translation: 提供实施例以改善光传输的直接检测。 在一个实施例中，用于直接检测系统的发射机的方法包括经由驱动电压在发射机的第一光路上的光调制器处驱动单边带（SSB）信号。 SSB信号相对于驱动电压足够线性，以允许在接收器处的直接检测。 该方法还包括在发射机的第二路径上生成DC载波信号。 SSB信号与发射机输出端的直流载波信号相结合。

公开(公告)号：WO2014201244A1

公开(公告)日：2014-12-18

申请号：PCT/US2014/042114

申请日：2014-06-12

Applicant: AURORA NETWORKS, INC.

Inventor： MYSORE, Sudhesh

IPC: H04B10/2513 ,  H04B10/58

CPC classification number: H04B10/504 ,  H04B10/25133 ,  H04B10/40 ,  H04B10/503 ,  H04B10/564 ,  H04B10/58

Abstract: A distortion compensation circuit compensates for the distortions generated by the dispersion-slope of an optical component and the frequency chirp of an optical transmitter. The dispersion compensation circuitry can be utilized in the optical transmitter, the optical receiver and/or at some intermediate point in a fiber-optic network. One embodiment of the compensation circuit utilizes a primary electrical signal path that receives at least a portion of the input signal and a delay line; and a secondary signal path in parallel to the primary path that receives at least a portion of the input signal and including: an amplifier with an electrical current gain that is proportional to the dispersion-slope of the optical component, an optional RF attenuator, an optional delay line, a "squarer" circuit, and a "differentiator" circuit. Another embodiment of the disclosure performs simultaneous, and independent, compensation of second-order distortions generated by both the dispersion-slope of a first optical component and the dispersion of a second optical component. Other embodiments of the disclosure perform adaptive predistortion for compensation of distortions generated by the dispersion-slope of a first optical component and the dispersion of a second optical component to maintain optimum compensation even if the dispersion properties of the optical components change with time.

Abstract translation: 失真补偿电路补偿由光学部件的色散斜率和光发射机的频率啁啾所产生的失真。 色散补偿电路可以用于光发射机，光接收机和/或在光纤网络的某个中间点处。 补偿电路的一个实施例利用接收输入信号和延迟线的至少一部分的主电信号路径; 以及与所述主路径并联的辅助信号路径，其接收所述输入信号的至少一部分，并且包括：具有与所述光学部件的色散斜率成比例的电流增益的放大器，可选的RF衰减器， 可选延迟线，“平方”电路和“微分器”电路。 本公开的另一实施例对由第一光学部件的色散斜率和第二光学部件的色散产生的二阶失真进行同时且独立的补偿。 本公开的其他实施例执行用于补偿由第一光学部件的色散斜率产生的失真的自适应预失真以及即使光学部件的色散特性随时间而变化的第二光学部件的色散以保持最佳补偿。