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Analyses of spectral efficiency and nonlinear tolerance of DPSK formats in 160-Gb/s Raman amplified systems

  • Xu, Zhenbo
  • Rottwitt, Karsten
  • Jeppesen, Palle
Publication Date
Jan 01, 2005
Online Research Database In Technology
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Five-channel 160-Gb/s wavelength-division-multiplexing (WDM) systems using ABA dispersion map and Raman amplification are investigated numerically. Transmission distance and system margin are evaluated for return-to-zero differential phase-shift keying (RZ-DPSK) and carrier-suppressed return-to-zero (CSRZ)-DPSK formats. The results show that RZ-DPSK can offer 2300-km system reach at large WDM channel spacing, while CSRZ-DPSK is more robust against nonlinear effects in the fibers and offers a reach of 1900 km at a spectral efficiency of 0.53 b/s/Hz. CSRZ-DPSK can also provide twice the dispersion tolerance of RZ-DPSK and larger spectral efficiency.

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