公开(公告)号：US08953939B2

公开(公告)日：2015-02-10

申请号：US13667708

申请日：2012-11-02

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Dayou Qian ,  Junqiang Hu ,  Lei Xu ,  Ting Wang

IPC: H04J14/06 ,  H04B10/04 ,  H04B10/12 ,  H04B10/50

CPC classification number: H04J14/06 ,  H04B10/5055

Abstract: Disclosed are universal QPSK transmitter structures and methods for generating different QPSK signals exhibiting different polarization schemes, namely PolMux, PolMod and PolSw. The bit rate of the generated signals is variable, thereby allowing the transmitter to adjust to varying network traffic conditions. Advantageously, the generated signals may be detected by analog receivers (PolSw-QPSK) and coherent receivers (PolMux-QPSK, PolMod-QPSK, and PolSw-QPSK).

Abstract translation: 公开了用于产生表现出不同偏振方案的不同QPSK信号的通用QPSK发射机结构和方法，即PolMux，PolMod和PolSw。 所产生的信号的比特率是可变的，从而允许发射机适应不同的网络业务状况。 有利地，所产生的信号可以由模拟接收机（PolSw-QPSK）和相干接收机（PolMux-QPSK，PolMod-QPSK和PolSw-QPSK）来检测。

公开(公告)号：US08798480B2

公开(公告)日：2014-08-05

申请号：US13646465

申请日：2012-10-05

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Ezra Ip ,  Dayou Qian

IPC: H04B10/04 ,  H04B10/54

CPC classification number: H04B10/541

Abstract: Structures and methods of generating 8-QAM signals through the effect of a cascaded I/Q modulator and Mach-Zhender modulator. The 8-QAM signals are generated by applying one binary sequence to the dual-drive Mach-Zehnder modulator (MZM) and two binary sequences to the I/Q modulator. Operationally, the I/Q modulator generates QPSK constellation(s), while the dual drive MZM either maintains the QPSK constellation at an out ring, or attenuates its amplitude to the inner ring and rotates its phase by π/4 phase depending on the binary data it was driven by.

Abstract translation: 通过级联I / Q调制器和Mach-Zhender调制器的影响产生8-QAM信号的结构和方法。 通过将一个二进制序列应用于双驱动马赫 - 曾德调制器（MZM）并将两个二进制序列应用于I / Q调制器来生成8-QAM信号。 在操作上，I / Q调制器产生QPSK星座，而双驱动MZM或者将QPSK星座维持在外环，或者将其振幅衰减到内环，并且根据其中的相位旋转其相位 二进制数据由它驱动。

公开(公告)号：US20140056585A1

公开(公告)日：2014-02-27

申请号：US13768487

申请日：2013-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Dayou Qian ,  Ting Wang

IPC: H04B10/27 ,  H04B10/50 ,  H04B10/40 ,  H04B10/61

CPC classification number: H04B10/27 ,  H04B10/2507 ,  H04B10/25137 ,  H04B10/272 ,  H04B10/40 ,  H04B10/50 ,  H04B10/516 ,  H04B10/61 ,  H04B10/613 ,  H04B10/616

Abstract: An optical access network with centralized digital optical line termination OLT including an optical line termination unit having a digital transmitter and a coherent receiver for downstream signal transmitting and upstream signal receiving, and at least one optical network unit ONU with transceiver functions for communicating with the OLT over an optical path, the ONU including intensity modulation and single photodiode detection, wherein the digital transmitter includes digital signal processing DSP, digital-to-analog conversion DAC and analog-to-digital conversion ADC functions that can be shared by all multiple ones of the ONU in the network, the DSP reducing or removing dispersion and non-linearity effects in the network and the coherent receiver enabling performance of the downstream stream signal transmitting to match that of the upstream signal receiving in the OLT.

Abstract translation: 具有集中数字光线路终端OLT的光接入网络，包括具有数字发射机的光线路终端单元和用于下行信号发射和上行信号接收的相干接收机，以及具有用于与OLT通信的收发机功能的至少一个光网络单元ONU 通过光路，ONU包括强度调制和单光电二极管检测，其中数字发射器包括数字信号处理DSP，数/模转换DAC和模数转换ADC功能，可由所有多个 在网络中的ONU，DSP减少或去除网络中的色散和非线性效应以及相干接收机，使下游流信号发送的性能能够匹配在OLT中接收的上行信号。