Chin. Phys. Lett.  2011, Vol. 28 Issue (6): 064214    DOI: 10.1088/0256-307X/28/6/064214
FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
Fiber Nonlinearity Post-Compensation by Optical Phase Conjugation for 40Gb/s CO-OFDM Systems
QIAO Yao-Jun**, LIU Xue-Jun, JI Yue-Feng
Key Laboratory of Information Photonics and Optical Communications (Ministry of Education), Beijing University of Posts and Telecommunications, Beijing 100876
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QIAO Yao-Jun, LIU Xue-Jun, JI Yue-Feng 2011 Chin. Phys. Lett. 28 064214
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Abstract Fiber nonlinearity impairments in a 40-Gb/s coherent optical orthogonal frequency division multiplexing (CO-OFDM) system are post-compensated for by a new method of fiber nonlinearity post-compensation (FNPC). The FNPC located before the CO-OFDM receiver includes an optical phase conjugation (OPC) unit and a subsequent 80-km-high nonlinear fiber (HNLF) as a fiber nonlinearity compensator. The OPC unit is based on a four wave mixing effect in a semiconductor optical amplifier. The fiber nonlinearity impairments in the transmission link are post-compensated for after OPC by transmission through the HNLF with a large nonlinearity coefficient. Simulation results show that the nonlinear threshold (NLT) (for Q> 10 dB) can be increased by about 2.5 dB and the maximum Q factor is increased by about 1.2 dB for the single−channel 40-Gb/s CO-OFDM system with periodic dispersion maps. In the 50-GHz channel spacing wavelength-division-multiplexing system, the NLT increases by 1.1 dB, equating to a 0.7 dB improvement for the maximum Q factor.
Keywords: 42.65.Hw      42.79.Sz     
Received: 10 March 2011      Published: 29 May 2011
PACS:  42.65.Hw (Phase conjugation; photorefractive and Kerr effects)  
  42.79.Sz (Optical communication systems, multiplexers, and demultiplexers?)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/6/064214       OR      https://cpl.iphy.ac.cn/Y2011/V28/I6/064214
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QIAO Yao-Jun
LIU Xue-Jun
JI Yue-Feng
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