Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/25051
Title: Coherent Phase-Modulated Optical Fiber Communications with Linear and Nonlinear Phase Noise
Authors: ZHANG SHAOLIANG
Keywords: Carrier phase recovery, Laser phase noise, Fiber nonlinearity, Coherent Detection
Issue Date: 6-Jan-2011
Source: ZHANG SHAOLIANG (2011-01-06). Coherent Phase-Modulated Optical Fiber Communications with Linear and Nonlinear Phase Noise. ScholarBank@NUS Repository.
Abstract: In this thesis, a computationally-linear decision aided (DA) maximum likelihood (ML) PE was introduced to eliminate the nonlinear computations while keeping or even improving the laser linewidth tolerance. We have conducted in-depth analysis on the performance of DA ML in different modulation formats, and observed that optimal memory length is related to the variances of the phase noise and additive noise. The parallel and serial implementations of the DA ML PE were also investigated to adapt itself to the high-speed optical receivers. However, the DA ML is subjected to the block length effect (BLE) because of a trade-off to average out the additive noise and phase noise. In order to address the BLE, a first-order filter was introduced to the DA ML algorithm, thus adaptively adjusting the filter gain based on the characteristics of the received signals. The adaptive DA algorithm was extended into the M-quadrature amplitude modulation (QAM) formats, where it was found that it suffers from the constellation penalty. Finally, two novel DSP algorithms were proposed to address the phase noises originating from the frequency offset and fiber nonlinearity, respectively.
URI: http://scholarbank.nus.edu.sg/handle/10635/25051
Appears in Collections:Ph.D Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
thesis_final.pdf3.94 MBAdobe PDF

OPEN

NoneView/Download

Page view(s)

388
checked on Dec 11, 2017

Download(s)

973
checked on Dec 11, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.