Title :
Analyses of spectral efficiency and nonlinear tolerance of DPSK formats in 160-Gb/s Raman amplified systems
Author :
Xu, Zhenbo ; Rottwitt, Karsten ; Jeppesen, Palle
Author_Institution :
Res. Center COM, Tech. Univ. of Denmark, Lyngby, Denmark
fDate :
7/1/2005 12:00:00 AM
Abstract :
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.
Keywords :
Raman spectra; channel spacing; differential phase shift keying; optical fibre amplifiers; optical fibre communication; optical fibre dispersion; optical modulation; wavelength division multiplexing; 160 Gbit/s; 1900 km; 2300 km; ABA dispersion map; CSRZ-DPSK format; DPSK formats; RZ-DPSK format; Raman amplification; WDM channel spacing; carrier-suppressed return-to-zero; dispersion tolerance; nonlinear tolerance; return-to-zero differential phase-shift keying; spectral efficiency; wavelength-division-multiplexing; Band pass filters; Channel spacing; Differential phase shift keying; Differential quadrature phase shift keying; Dispersion; Erbium-doped fiber amplifier; Modulation; Spectral analysis; Stimulated emission; Wavelength division multiplexing; Differential phase-shift keying (DPSK); Raman scattering; modulation format; optical transmission;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.848403
