Lasers, Fiber Optics, and Communications

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

[+] Author Affiliations
Tianyun Zhang, Shuchang Yao, Songnian Fu, Ming Tang, Deming Liu

Huazhong University of Science and Technology, School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, 1037 Luoyu Avenue, Wuhan 430074, China

Opt. Eng. 53(12), 126110 (Dec 17, 2014). doi:10.1117/1.OE.53.12.126110
History: Received September 22, 2014; Accepted November 18, 2014
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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.

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© 2014 Society of Photo-Optical Instrumentation Engineers

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", Opt. Eng. 53(12), 126110 (Dec 17, 2014). ; http://dx.doi.org/10.1117/1.OE.53.12.126110


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