1.6-Tb/s (40 40 Gb/s) Dense WDM Transmission Experiment Over 480 km (6 80 km) Using Carrier-Suppressed Return-to-Zero Format

Kiyoshi FUKUCHI  Kayato SEKIYA  Risato OHHIRA  Yutaka YANO  Takashi ONO  

IEICE TRANSACTIONS on Communications   Vol.E85-B    No.2    pp.403-409
Publication Date: 2002/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Issue on 40 Gbit/s Optical Transmission Technologies)
40-Gb/s transmission,  WDM,  modulation format,  fiber nonlinearity,  terabit transmission,  

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A 1.6-Tb/s dense WDM signal was successfully transmitted over 480 km using the carrier-suppressed return-to-zero (CS-RZ) modulation format. The CS-RZ format was chosen because it exhibited better transmission performance over a wide fiber-input power window than the NRZ and RZ formats in a 40-Gb/s-based WDM transmission experiment with 100-GHz channel spacing, confirming its nonlinearity-insensitive nature in dense WDM systems. With the wide power window of CS-RZ, we achieved stable transmission of 4040-Gb/s WDM signals over a 480-km (680 km) standard SMF line with only the C-band, in which a spectral ripple remained during transmission. Distributed Raman amplification and forward error correction were not used, providing a margin for already installed transmission lines.