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Optical Engineering

Joint digital signal processing of Nyquist-wavelength division multiplexing superchannel with group detection
Author(s): Tianyun Zhang; Shuchang Yao; Songnian Fu; Ming Tang; Deming Liu
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Paper 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.

Paper Details

Date Published: 17 December 2014
PDF: 4 pages
Opt. Eng. 53(12) 126110 doi: 10.1117/1.OE.53.12.126110
Published in: Optical Engineering Volume 53, Issue 12
Show Author Affiliations
Tianyun Zhang, Huazhong Univ. of Science and Technology (China)
Shuchang Yao, Huazhong Univ. of Science and Technology (China)
Songnian Fu, Huazhong Univ. of Science and Technology (China)
Ming Tang, Huazhong Univ. of Science and Technology (China)
Deming Liu, Huazhong Univ. of Science and Technology (China)


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