Patent ID: 7349632
Filing Date: 2008-03-25
Classification: G02F,H04J

Abstract:
1. A wavelength selection control method, comprising the steps of: detecting a plurality of reference RF frequencies by varying a frequency of a RF signal supplied to a reference acousto-optic tunable filter, a plurality of reference signals having respective reference wavelengths being input to said reference acousto-optic tunable filter, said reference RF frequencies being in correspondence to the reference wavelengths; performing tracking to optimize the reference RF frequencies; calculating, from the reference RF frequencies, a plurality of dependent RF frequencies corresponding to wavelengths of a plurality of WDM transmission signals, and recording the calculated dependent RF frequencies in a first register; repeating the step of detecting, the step of performing tracking, and the step of calculating and recording when a request for wavelength selection is not received; selecting, from the first register, one of the dependent RF frequencies in correspondence to a requested wavelength, and recording the selected dependent RF frequency to in second register when a request of wavelength selection is received, said second register being used for an acousto-optic tunable filter at a port in operation, the WDM transmission signals being supplied to said port in operation; and generating a RF signal having the selected dependent RF frequency recorded in the second register, and supplying the RF signal having the selected dependent RF frequency to the acousto-optic tunable filter at the port in operation.