Joint digital signal processing of Nyquist-wavelength division multiplexing superchannel with group detection

Tianyun Zhang; Shuchang Yao; Songnian Fu; Ming Tang; Deming Liu

doi:10.1117/1.OE.53.12.126110

17 December 2014 Joint digital signal processing of Nyquist-wavelength division multiplexing superchannel with group detection

Tianyun Zhang, Shuchang Yao, Songnian Fu, Ming Tang, Deming Liu

Author Affiliations +

Optical Engineering, Vol. 53, Issue 12, 126110 (December 2014). https://doi.org/10.1117/1.OE.53.12.126110

Abstract

To relax the limited sampling rate of an analog-to-digital converter (ADC) and to reduce the complexity of conventional fiber-optical superchannel coherent detection, we propose and demonstrate a joint digital signal processing (DSP) technique of Nyquist-wavelength division multiplexing superchannel with group detection. At the receiver side, three Nyquist-spaced channels with 12.5 Gbaud polarization multiplexing-quadrature phase shift keying signals are group detected with a sampling rate per channel of 1.33 times over the normal sampling rate. A modified carrier separation technique is then put forward to retrieve the high-frequency interference component of both the designated channel and its adjacent channels, which can subsequently be used to recover the designated channel with new constant modulus algorithm-based joint multiinput-multioutput equalizers. The results show that the proposed group detection and joint DSP algorithm can simultaneously improve the transmission performance and reduce the complexity of both the transmitter and receiver, regardless of bandwidth restrictions from the waveshaper, ADC module, and coherent receiver.

Citation Download Citation

Tianyun Zhang, Shuchang Yao, Songnian Fu, Ming Tang, and Deming Liu "Joint digital signal processing of Nyquist-wavelength division multiplexing superchannel with group detection," Optical Engineering 53(12), 126110 (17 December 2014). https://doi.org/10.1117/1.OE.53.12.126110

Published: 17 December 2014

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