scholarly journals Equalization-enhanced phase noise for coherent-detection systems using electronic digital signal processing

2008 ◽  
Vol 16 (20) ◽  
pp. 15718 ◽  
Author(s):  
William Shieh ◽  
Keang-Po Ho
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Phase Noise ◽  
Digital Signal ◽  
Coherent Detection ◽  
Detection Systems

Analysis on Digital Signal Processing and Algorithm Based on Coherent Light

2014 ◽  
Vol 989-994 ◽  
pp. 2024-2028
Author(s):  
Ye Xing ◽  
Lu Zhang ◽  
Zhe Yuan Cheng ◽  
Kai Gu
Keyword(s):  
Signal Processing ◽  
Comparative Analysis ◽  
Digital Signal Processing ◽  
Phase Noise ◽  
Carrier Phase ◽  
Digital Signal ◽  
Minimal Cost ◽  
Signal Distortion ◽  
Coherent Light ◽  
Fiber Dispersion

In order to use minimal cost to compensate signal distortion caused by fiber dispersion and carrier phase noise etc, this paper mainly puts forward 2 different self-adaption compensation algorithms in algorithm part of digital signal processing, through test and comparative analysis, it indicates that the performance of the best matching and the nature expression based on GCT is the best.

scholarly journals Generation and coherent detection of QPSK signal using a novel method of digital signal processing

2018 ◽  
Vol 32 (04) ◽  
pp. 1850103
Author(s):  
Yuan Zhao ◽  
Bingliang Hu ◽  
Zhen-An He ◽  
Wenjia Xie ◽  
Xiaohui Gao
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Digital Signal ◽  
Local Oscillator ◽  
Coherent Detection ◽  
Detection Methods ◽  
Homodyne Detection ◽  
Modulation Formats ◽  
Detection Scheme ◽  
Labview Software

We demonstrate an optical quadrature phase-shift keying (QPSK) signal transmitter and an optical receiver for demodulating optical QPSK signal with homodyne detection and digital signal processing (DSP). DSP on the homodyne detection scheme is employed without locking the phase of the local oscillator (LO). In this paper, we present an extracting one-dimensional array of down-sampling method for reducing unwanted samples of constellation diagram measurement. Such a novel scheme embodies the following major advantages over the other conventional optical QPSK signal detection methods. First, this homodyne detection scheme does not need strict requirement on LO in comparison with linear optical sampling, such as having a flat spectral density and phase over the spectral support of the source under test. Second, the LabVIEW software is directly used for recovering the QPSK signal constellation without employing complex DSP circuit. Third, this scheme is applicable to multilevel modulation formats such as M-ary PSK and quadrature amplitude modulation (QAM) or higher speed signals by making minor changes.

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