Patent ID: 6687433
Filing Date: 2004-02-03
Classification: G02B,H04B

Abstract:
A WDM optical communication system comprising at least one hybrid transmission unit for transmitting a plurality of signals included in a 1.58-&mgr;m wavelength band, said hybrid transmission unit comprising:a first single-mode optical fiber having a zero-dispersion wavelength in a 1.3-&mgr;m wavelength band; and a dispersion-shifted optical fiber provided so as for light emitted from said first single-mode optical fiber to propagate therethrough, said dispersion-shifted optical fiber having a zero-dispersion wavelength residing in a 1.55-&mgr;m wavelength band and, at a wavelength of 1.58 &mgr;m, a dispersion D with an absolute value of 0.5 ps/nm/km or more, said dispersion-shifted optical fiber satisfying the condition of PD&CenterDot;CS&leq;4.2Ã—1013&af;[(W&CenterDot;m)/s]where P is the optical power per channel in said plurality of signals launched to said dispersion-shifted fiber, and CS is the channel spacing in said plurality of signals.