Patent ID: 6282361
Filing Date: 2001-08-28
Classification: G02B,G02F,H04B

Abstract:
A multi-channel variable optical attenuator for a wavelength multiplexed light, which contains a plurality of signal lights each having a specific wavelength, said attenuator comprising:a master control circuitry for detecting a wavelength dependence of the wavelength multiplexed light and outputting a single master control signal corresponding to the wavelength dependence;a plurality of optical waveguides, the signal lights being transmitted in the corresponding waveguides, respectively;a plurality of attenuation adjusting portions provided in the respective waveguides, the attenuation adjusting portions attenuating the signal lights transmitted therethrough; anda control circuitry for controlling an attenuation amount of the respective signal lights, based on said single master control signal, by a predetermined rate specific to the respective adjusting portions.