US 6,687,433 B2 · WDM optical communication system

Abstract

The present invention relates to a WDM optical communication system comprising a structure which effectively suppresses the waveform deterioration resulting from nonlinear optical phenomena of each signal in a 1.58-μm wavelength band in an optical transmission line including a dispersion-shifted optical fiber having a zero-dispersion wavelength in a 1.55-μm wavelength band. The WDM optical communication system includes a hybrid transmission unit in which a single-mode optical fiber and a dispersion-shifted optical fiber are arranged such that signals successively pass therethrough. The single-mode optical fiber has a zero-dispersion wavelength in a 1.3-μm wavelength band and an effective area ASMF at a wavelength of 1.58 μm. The dispersion-shifted optical fiber has a zero-dispersion wavelength in the 1.55-μm wavelength band and, at a wavelength of 1.58 μm, a dispersion with an absolute value of 0.5 ps/nm/km or more and an effective area ADSF smaller than the effective area ASMF of the single-mode optical fiber.

Claims21

Dependent claims

A WDM optical communication system comprising at least one hybrid transmission unit for transmitting a plurality of signals included in a 1.58-μm wavelength band, said hybrid transmission unit comprising:

a first single-mode optical fiber having a zero-dispersion wavelength in a 1.3-μm 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-μm wavelength band and, at a wavelength of 1.58 μm, a dispersion D with an absolute value of 0.5 ps/nm/km or more, said dispersion-shifted optical fiber satisfying the condition of P D · CS ≤ 4.2 × 10 13 ⁡ [ ( W · 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.

1 more element

Dependencies are inferred from the claim text.

WDM optical communication system

Life of this patent

WDM optical communication system

Life of this patent

Abstract

Claims21