Patent ID: 6545780
Filing Date: 2003-04-08
Classification: H04J

Abstract:
A wavelength allocation method applying to a wavelength division multiplexing transmission system in which signal lights of N channels (N is an integer equal to or greater than 3) are multiplexed and transmitted through an optical fiber with a zero dispersion wavelength &lgr;0, wherein:when the case of the frequency interval of any arbitrary frequency intervals is different from the frequency interval of any two other frequencies is called â€œcompletely unequally spaced channel allocationâ€  in the frequency interval of a plurality of channels, completely unequally spaced channel allocation for N1-channels among said N -channels in a first wavelength region that includes said zero dispersion wavelength &lgr;0, is carried out; next completely unequally spaced channel allocation of N2-channels among said N-channels in a second wavelength region adjacent to said first wavelength region is carried out; subsequently in the same manner completely unequally spaced channel allocation of N3-, N4-, . . . , Nk-channels (where the integers N1 and Nk respectively indicating the number of channels included in the wavelength regions from 1 to k satisfy the relationship N1&gE;N2&gE; . . . >Nj&gE;Nkâˆ’1&gE;Nk, and at least 2 of the integers N1 through Nk are different numbers) is carried out; and carrying out the allocation of wavelengths by setting the wavelength intervals of said N channels by combining all of said wavelength allocations included in the wavelength region for which said completely unequally spaced wavelength allocation has been carried out, or a part of the wavelength allocations included in the wavelength region outside of said first wavelength region for which completely unequally spaced wavelength allocation has been carried out, with the wavelength allocation included in said first wavelength region.