Patent ID: 7589840

Claim:
A wavelength measurement or monitoring system, comprising: providing a tunable Fabry-Perot optical filter; using at least one known light source to calibrate and correlate separate wavelength bands scanned by the tunable Fabry-Perot optical filter; utilizing at least one wavelength reference to calibrate at least one wavelength band of the tunable Fabry-Perot optical filter including simultaneously coupling the outputs of first and second lasers to a wavelength meter and to the tunable Fabry-Perot optical filter; transferring the wavelength reference to a wavelength band that is identified for measurement when the wavelength reference is not in a wavelength band identified for measurement by the tunable Fabry-Perot optical filter; scanning an unknown optical signal through the tunable Fabry-Perot optical filter; and specifying a wavelength in the unknown optical signal.