OPTICAL SWITCHING DEVICE AND OPTICAL INTEGRATED CIRCUIT EQUIPPED WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an optical switching device with which a resonant wavelength is kept constant even when the temperature changes.;SOLUTION: An AC power supply 56 applies an AC voltage to detect a wavelength shift from an original resonant wavelength of a resonant wavelength of an optical resonator to the optical resonator 3 via an electrode 41. A photodetector 51 detects intensity of output light of an optical waveguide 2 when the AC voltage is applied to the optical resonator 3. An AC amplifier 52 amplifies the intensity of the output light received from the photodetector 51. A synchronous detection circuit 53 rectifies the intensity of the output light amplified with the AC amplifier 52, and an integrator 55 integrates the intensity of the rectified output light and applies a DC voltage corresponding to the integrated value to the optical resonator 3. The integrator 55 repeatedly applies the DC voltage until the wavelength shift in the optical resonator 3 disappears, and when the wavelength shift disappears, applies a DC voltage generated with a charge accumulated in a capacitor 52, to the optical resonator 3.;COPYRIGHT: (C)2010,JPO&INPIT