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Unrepeatered 40 Gbit/s-WDM Transmission Employing Aeff Managed Raman Amplification and CS-RZ Modulation
IEICE TRANSACTIONS on Communications Vol.E85-B No.2 pp.446-453
Publication Date: 2002/02/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on 40 Gbit/s Optical Transmission Technologies)
Full Text: PDF(918.2KB)
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.