The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 2003
Filed:
Apr. 21, 1999
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
By using a combination of a plurality of completely unequally spaced channel allocations, the influence of four wave mixing is mitigated even while it is incompletely unequally spaced channel allocation, and it is possible both to decrease the occupied bandwidth and increase the number of channels. A plurality of completely unequally spacing channel allocations are combined, and the number of channels changes depending on the amount of scattering of an optical fiber and the frequency that there exists zero dispersion wavelengths on a transmission path. The completely unequally spaced channel allocations of N -channels in a first wavelength region including the zero dispersion wavelength &lgr; or the mode zero dispersion wavelength &lgr; are partitioned, and then in sequence the completely unequally spaced channel allocation of N -, N -, . . . , channels is partitioned, and the wavelength interval of N channels is set by combining all or a part thereof (where N ≧N 24 . . . >N ≧N ≧N ).