Patent ID: 6115122
Filing Date: 2000-09-05
Classification: G01D,G01J,G02B

Abstract:
A method for determining wavelengths of light reflected or transmitted from an optical device which comprises the steps of:a. providing a wavelength calibrated multi-wavelength reference which comprises an interferometer which provides a spectral output that is a comb of peaks spanning a wavelength range and a fiber Bragg grating (FBG) which provides spectral output at a selected wavelength within said wavelength range, wherein the spectral output of said FBG marks a peak of said comb identifying its wavelength, the combined spectral output of said wavelength reference providing a reference spectral output;b. providing a tunable Fabry-Perot filter;c. introducing the reference spectral output into said tunable Fabry-Perot filter and scanning the reference spectral output with said tunable Fabry-perot filter to calibrate said tunable Fabry-Perot filter;d. introducing the reflected light or transmitted light from said optical device into said calibrated Fabry-Perot filter and scanning said light with said calibrated tunable Fabry-Perot filter to determine the wavelengths therein.