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.

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

scholarly journals Comparison of DPSK and RZ-DPSK Modulations in Optical Channel with Speed of 10 Gbps

2017 ◽  
Vol 41 (2) ◽  
pp. 185-196 ◽  
Author(s):  
Petr Ivaniga ◽  
Tomáš Ivaniga
Keyword(s):  
Phase Shift ◽  
Optical Communication ◽  
Error Rate ◽  
High Speed ◽  
Optical Network ◽  
Optical Channel ◽  
Q Factor ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
Optic Waveguide

<div>This article is devoted to the problematic of error rate and modulations in optical communication. Optic waveguide shows insufficiencies in high speed transfers manifested by corrupted transfer. Although modern technological processes contributed to lowering these insufficiencies, it would be uneconomical to completely reconstruct the optical network infrastructure. The solution is only partial so we approach more economical methods, such as modulations. The article works with a 10 Gbps channel with two modulation types, namely DPSK (Differential Phase Shift Keyed) and RZ-DPSK (Return to Zero-Differential Phase Shift Keyed). These modulations are evaluated and compared according to BER (Bit Error Rate) and Q-factor.<div> </div></div>

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