Patent ID: 6078394
Filing Date: 2000-06-20
Classification: G01J,H04B

Abstract:
A method of thermally calibrating a scan range of an optical spectrometer operative for measuring frequencies of a plurality of optical transmitter signals from a plurality of optical transmitters, comprising the steps of:a) optically scanning a Fabry-Perot etalon with a local oscillator to generate a plurality of transmission peaks equispaced in frequency;b) detecting the transmitter signals from the transmitters using the local oscillator;c) detecting an optical frequency reference signal using the local oscillator;d) determining a scan offset by comparing, in time, one of the peaks with the reference signal, the scan offset being a function of the ambient temperature of the etalon; ande) offsetting, in time, the transmitter signals with the scan offset to obtain thermally-corrected times for the transmitter signals simultaneously with the measuring by the spectrometer.