Demodulation of co-polarized 20-Gbit/s QPSK signals with 16-GHz spacing after 200-km transmission using coherent detection and digital signal processing

2005 ◽  
Author(s):  
S. Tsukamoto ◽  
D.-S. Ly-Gagnon ◽  
K. Katoh ◽  
K. Kikuchi
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Digital Signal ◽  
Coherent Detection

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.

scholarly journals Electronic post-compensation of WDM transmission impairments using coherent detection and digital signal processing

2008 ◽  
Vol 16 (2) ◽  
pp. 880 ◽  
Author(s):  
Xiaoxu Li ◽  
Xin Chen ◽  
Gilad Goldfarb ◽  
Eduardo Mateo ◽  
Inwoong Kim ◽  
...  
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Digital Signal ◽  
Coherent Detection ◽  
Transmission Impairments ◽  
Wdm Transmission
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