Patent ID: 6603559
Filing Date: 2003-08-05
Classification: G01K

Abstract:
A silicon-on-insulator optical waveguide Michelson interferometer temperature sensor, comprising a silicon-on-insulator waveguide coupler, two silicon-on-insulator waveguide Bragg gratings, an optical power detector, and a microprocessor;said silicon-on-insulator waveguide coupler comprising a single mode ridge-type waveguide, a single mode S-type ridge waveguide, a single mode parallel-coupling waveguide, a silicon guiding layer, a silicon dioxide insulator layer and a silicon substrate; said silicon-on-insulator waveguide Bragg grating comprising an amorphous silicon layer, a sinusoidal grating in the silicon layer, a silicon dioxide (SiO2) insulator layer and a silicon substrate, wherein said silicon dioxide insulator layer is covered by said sinusoidal grating in said silicon layer, and said sinusoidal grating in said silicon layer is covered by said amorphous silicon layer; and wherein when light passes through said silicon-on-insulator waveguide coupler, the light goes through the two Bragg gratings and is reflected to the waveguide coupler, and an interference spectrum is detected, the peak of the spectrum of the reflected light varying according to a temperature to be measured, whereby the temperature to be measured is obtained by using said optical power detector to detect said spectrum.