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Optical Engineering

Investigation of chirped return-to-zero differential phase-shift keying (DPSK) modulation format and its performance comparison with return-to-zero DPSK in 40×40-Gbit/s dense wavelength-division multiplexing transmission systems
Author(s): Xiaoxia Wu; Kun Xu; Guangshan Lu; Jian Wu; Jintong Lin
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Paper Abstract

Chirped return-to-zero differential phase-shift keying (CRZ-DPSK) modulation format under different channel spacings is investigated and compared with RZ-DPSK in 40×40-Gbit/s dense wavelength-division multiplexing transmission systems. An optimization operation over a wide range of parameters, such as span input power, precompensation percent, and chirp parameter (only for CRZ-DPSK), is performed in the simulation. Simulation results show that CRZ-DPSK demonstrates better performance in transmission distance, nonlinear, and dispersion tolerance with wider channel spacing of 100 GHz. When the channel spacing is reduced to 75 GHz, a slight degradation is observed for CRZ-DPSK and the performances of both formats are acceptable. But when it is reduced from 75 GHz to 50 GHz, a clear degradation of the CRZ-DPSK performance is measured, but RZ-DPSK demonstrates no significant degradation.

Paper Details

Date Published: 1 July 2006
PDF: 7 pages
Opt. Eng. 45(7) 075004 doi: 10.1117/1.2221321
Published in: Optical Engineering Volume 45, Issue 7
Show Author Affiliations
Xiaoxia Wu, Beijing Univ. of Posts and Telecommunications (China)
Kun Xu, Beijing Univ. of Posts and Telecommunications (China)
Guangshan Lu, Beijing Univ. of Posts and Telecommunications (China)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)


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