Title :
BER performance of bandwidth-limited QPSK optical coherent receiver with carrier phase estimation
Author :
Tianping Feng ; Jian Chen ; Zhaohui Ma ; Yuanwei Fan ; Xiaodi You
Author_Institution :
Sch. of InfoComm Eng., Nanjing Univ. of Posts & Telecommun., Nanjing, China
Abstract :
In this paper, the bit error-rate (BER) performance considering the impact of bandwidth limitation of electronic devices is investigated in QPSK coherent receiver with carrier phase estimation. Before signal sampling, we introduce a low-pass filter to model this bandwidth limitation which induces inter-symbol interference (ISI). Two phase estimation (PE) schemes, decision-aided maximum likelihood (DAML) and M-th power, are considered. Monte-Carlo (MC) simulation results show that, for different optical signal to noise ratios (OSNRs) and PE schemes, 0.7-0.9 times the symbol rate is always a reasonable bandwidth range which includes the optimal bandwidth. It is also found that the advantage of DAML receiver compared to M-th power would be destroyed when ISI is determinant of BER performance.
Keywords :
Monte Carlo methods; error statistics; intersymbol interference; light interference; low-pass filters; maximum likelihood estimation; optical receivers; phase estimation; quadrature phase shift keying; signal sampling; BER performance; DAML receiver; ISI; M-th power; Monte-Carlo simulation; OSNR; PE scheme; bandwidth limitation impact; bandwidth range; bandwidth-limited QPSK optical coherent receiver; bit error-rate performance; carrier phase estimation; decision-aided maximum likelihood; intersymbol interference; low-pass filter; optical signal-to-noise ratios; signal sampling; Bandwidth; Bit error rate; Optical filters; Optical noise; Phase estimation; Phase shift keying; Receivers; BER; ISI; QPSK; bandwidth limitation; phase estimation (PE);
Conference_Titel :
Optical Communications and Networks (ICOCN), 2015 14th International Conference on
Conference_Location :
Nanjing
DOI :
10.1109/ICOCN.2015.7203639
