Patent ID: 6594069
Filing Date: 2003-07-15
Classification: G02F,H04J

Abstract:
A control method of wavelength characteristics of an optical wavelength variable filter of band rejection type including a plurality of optical filter sections each blocking a light corresponding to a selected wavelength from passing through, said optical filter sections being cascade connected to be in a multi-staged structure,wherein, when said optical wavelength variable filter has wavelength characteristics formed with a blocking band including a wavelength band according to a deviation amount obtained by deviating respective selected wavelengths from one another of said plurality of optical filter sections, a dropped light to be blocked from passing through at the optical filter section corresponding to the selected wavelength most closest to the center wavelength of said blocking band, among said respective selected wavelengths, is taken out to be monitored, and said respective selected wavelengths are adjusted based on a peak wavelength of said monitored dropped light, to control said wavelength characteristics.