Patent ID: 7194208

Claim:
A wavelength-division multiplexing optical transmission system including: an optical multiplexer for multiplexing plural optical input signals having wavelengths included in a predetermined transmission wavelength band and generating a wavelength-division multiplexing optical signal; a dispersion-compensating device for performing a dispersion compensation to said wavelength-division multiplexing optical signal; an optical transmission path for transmitting said wavelength-division multiplexing optical signal from a transmitter terminal to a receiver terminal; and an optical receiver for receiving said wavelength-division multiplexing optical signal transmitted through said optical transmission path, wherein said dispersion-compensating device provides a compensating-purpose dispersion D 2 to said wavelength-division multiplexing optical signal, and wherein said compensating-purpose dispersion D 2 satisfies conditions that at any wavelength “λ” included in said transmission wavelength band, if dD 1 (λ)/dλ≠0 and not infinite is established, then {dD 1 (λ)/dλ}×{dD 2 (λ)/dλ≠0}<0 is also established, and if dD 1 (λ)/dλ≠0 is established, then dD 2 (λ)/dλ=0 is also established, where D 1 represents a dispersion generated in said wavelength-division multiplexing optical signal during when said wavelength-division multiplexing optical signal is transmitted through said transmission path from said transmitter terminal to said receiver terminal.