Unrepeatered 40 Gbit/s-WDM Transmission Employing Aeff Managed Raman Amplification and CS-RZ Modulation

Katsuhiro SHIMIZU  Naoki SUZUKI  Kaoru KINJO  Kazuyuki ISHIDA  Satoshi KAJIYA  Takashi MIZUOCHI  Kuniaki MOTOSHIMA  Yukio KOBAYASHI  Kumio KASAHARA  

IEICE TRANSACTIONS on Communications   Vol.E85-B    No.2    pp.446-453
Publication Date: 2002/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on 40 Gbit/s Optical Transmission Technologies)
Raman amplification,  unrepeatered transmission,  40 Gbit/s,  WDM,  CS-RZ,  

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Methodologies for more efficient Raman amplification and a more suitable modulation format for 40 Gbit/s WDM unrepeatered transmission are investigated. Management of the fiber effective area is proposed to realize low noise distributed Raman amplification. An Aeff management technique in which low-Aeff fiber is located in a median section instead of the last section, was confirmed numerically and experimentally to improve the OSNR and Q-factor. Carrier-suppressed-return-to-zero (CS-RZ) modulation has the advantage of reducing fiber-nonlinearity effects and permitting denser multiplexing of the wavelengths. 40 Gbit/s 32-channel unrepeatered WDM transmission over 202 km was demonstrated employing the proposed methodologies.