초록 ▼

A multi-wavelength reference for use in identifying and measuring wavelengths of radiation from an optical device. The invention provides an interferometer to generate a comb of accurately spaced peaks spanning a selected wavelength range combined with a fiber Bragg grating (FBG) of known Bragg wave

A multi-wavelength reference for use in identifying and measuring wavelengths of radiation from an optical device. The invention provides an interferometer to generate a comb of accurately spaced peaks spanning a selected wavelength range combined with a fiber Bragg grating (FBG) of known Bragg wavelength to generate a peak or notch of known wavelength for use in identifying or marking a peak of the comb. The combination provides an accurate multi-wavelength reference useful in particular with high resolution wavelength scanners, such as tunable FFPI. The invention further provides systems for controlling, and/or compensating for, relative shifts in the wavelengths of the interferometer and the FBG as a function of changing temperature.

대표청구항 ▼

[ We claim:] [1.] 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 span

[ We claim:] [1.] 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.