Adaptive Step-Size Constant-Modulus Algorithm for High-Speed Optical Coherent Communication System

2012 ◽  
Vol 32 (10) ◽  
pp. 1006004 ◽  
Author(s):  
邸雪静 Di Xuejing ◽  
童程 Tong Cheng ◽  
张霞 Zhang Xia ◽  
张晓光 Zhang Xiaoguang ◽  
席丽霞 Xi Lixia
Keyword(s):  
Communication System ◽  
High Speed ◽  
Constant Modulus ◽  
Constant Modulus Algorithm ◽  
Step Size ◽  
Adaptive Step Size ◽  
Coherent Communication ◽  
Adaptive Step

Optical communication equalized technique suitable for high-speed transmission

2017 ◽  
Vol 31 (19-21) ◽  
pp. 1740048 ◽  
Author(s):  
Yaolin Zhu ◽  
Hao Guan
Keyword(s):  
Optical Communication ◽  
Error Rate ◽  
High Speed ◽  
Signal Transmission ◽  
Optical Signal ◽  
Constant Modulus ◽  
Constant Modulus Algorithm ◽  
Step Size ◽  
Eye Opening ◽  
The Mean

To solve the phase distortion and high error rate in optical signal transmission, an equalized technique is proposed, which aims to improve the constant modulus algorithm (CMA). In order to correct phase rotating and reduce the error rate with 64 quadrature amplitude modulation (QAM), the method takes the mean square error as the judgment and utilizes the time-varying step size. Simulation results demonstrate that the proposed algorithm can improve the convergence speed of constellation points, make the eye opening larger, and the signal noise ratio (SNR) can be increased by 4 dB under the same bit error rate (BER), which is efficient for the recovery of information in high-speed transmission.

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