Nonlinear Electrical Compensation for the Coherent Optical OFDM System

作者：Pan Jie^*; Cheng Chi Hao

来源：Journal of Lightwave Technology, 2011, 29(2): 215-221.

DOI：10.1109/JLT.2010.2098017

• Equalizers
• nonlinear distortion
• nonlinear systems
• orthogonal functions
• optical fiber communication
• OFDM
• Volterra series

A main drawback of Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) system is its sensitivity to fiber nonlinearity. Nonlinear electrical equalizer based on Volterra model has been demonstrated capable of compensating fiber nonlinear distortion in an OOK or PSK optical communication system. However, the implementation complexity of a Volterra model based electrical equalizer prohibits its deployment in a real-life CO-OFDM system. In this paper, we demonstrate that the number of kernels of a Volterra model based equalizer can be significantly reduced using the modified Gram-Schmidt method with reorthogonalization techniques. The resulting "sparse" Volterra model based electrical equalizer and the electrical equalizer based on the "full" Volterra model have comparable performance and can compensate intra-channel nonlinearity of a 16-QAM 100 Gbit/s CO-OFDM System.

• 出版日期2011-1-15