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N 40-Gbit/s DWDM Transport System Using Novel Return-to-Zero Formats with Modulation Bandwidth Reduction
IEICE TRANSACTIONS on Communications
Publication Date: 2002/02/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Issue on 40 Gbit/s Optical Transmission Technologies)
modulation format, 40 Gbit/s, duobinary, CS-RZ, DCS-RZ,
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This paper describes the impact of novel Return-to-Zero (RZ) formas for dense wavelength-division-multiplexing (DWDM) transport systems using 40-Gbit/s channels. The introduction of phase modulation using phase reversal in RZ-signal encoding process dramatically reduces its optical modulation bandwidth and enhances its tolerance against fiber nonlinearities. By using proposed RZ formats, DWDM transmission performance in 40-Gbit/s channels can be enhanced with high spectral efficiency compared with conventional Non-Return-to-Zero (NRZ) and Return-to-Zero (RZ) formats.