Digital signal processing for coherent multi-level modulation formats (Invited Paper)

2010 ◽  
Vol 8 (9) ◽  
pp. 863-870 ◽  
Author(s):  
周翔 Xiang Zhou
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Digital Signal ◽  
Modulation Formats ◽  
Multi Level

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.

Digital Signal Processing for Dual-Polarization Intensity and Interpolarization Phase Modulation Formats Using Stokes Detection

2016 ◽  
Vol 34 (1) ◽  
pp. 188-195 ◽  
Author(s):  
Mathieu Chagnon ◽  
Mohamed Morsy-Osman ◽  
David Patel ◽  
Venkat Veerasubramanian ◽  
Alireza Samani ◽  
...  
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Phase Modulation ◽  
Digital Signal ◽  
Dual Polarization ◽  
Modulation Formats
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