Liu Ji-hong,Li Zhao-lin,Liang Meng.Effects of laser phase noise on the performance of optical coherent receivers[J].Optoelectronics Letters,2012,8(3):193-196 Effects of laser phase noise on the performance of optical coherent receivers Author Name Affiliation Liu Ji-hong  School of Electrical Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China  Li Zhao-lin  School of Electrical Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China  Liang Meng  School of Electrical Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China  Abstract:       Laser phase noise (LPN) plays an important role in optical coherent systems. Based on the algorithm of Viterbi-Viterbi carrier phase estimation (CPE), the effects of LPN imposed on the coherent receivers are investigated for quadrature phase shift keying (QPSK), 8 phase shift keying (8PSK) and 16-quadrature amplitude modulation (16-QAM) optical coherent systems, respectively. The simulation results show that the optimal block length in the phase estimation algorithm is a tradeoff between LPN and additive white Gaussian noise (AWGN), and depends on the level of modulation formats. The resolution requirements of analog to digital converter (ADC) in the coherent receivers are independent of LPN or the level of modulation formats. For the bit error rate (BER) of 10−3, the required bit number of ADC is 6, and the gain is marginal for the higher resolution. Hits: 3924 Download times: 588 This work has been supported by the Scientific Research Program Funded by Shaanxi Provincial Education Department (No.11JK1006). View Full Text    Download reader