Patent ID: 7653310
Filing Date: 2010-01-26
Classification: H04B,H04J

Abstract:
1. A WDM (Wavelength Division Multiplex) transmission system comprising: a plurality of fixed dispersion compensators of which the dispersion amount is fixed; a plurality of optical transmission lines for connecting said fixed dispersion compensators one to another; a variable dispersion compensator of which the dispersion amount is variable for controlling the dispersion amount of the optical signals received through said plurality of fixed dispersion compensators and said plurality of optical transmission lines for controlling the dispersion amount in response to the optical signals received; and a control circuit comprising further a transmission line dispersion table storing the information of dispersion wavelength dependency characteristic of said optical transmission lines and a compensator dispersion table storing the information of dispersion wavelength dependency characteristic of said fixed dispersion compensators and for controlling the dispersion amount of said variable dispersion compensator, wherein said control circuit acquires the information of each of said optical transmission lines and the information of each of said fixed dispersion compensators, computes the accumulated dispersion amount for each wavelength in said optical transmission lines and said fixed dispersion compensators by referring said transmission line dispersion table and compensator dispersion table, and controls the dispersion amount for each wavelength of said variable dispersion compensator based on the accumulated dispersion amount computed.