Patent ID: 6671434
Filing Date: 2003-12-30
Classification: G02B,H04J

Abstract:
An optical performance monitor comprising:a first port for launching an optical data signal including a plurality of wavelength channels within a wavelength range; a second port for launching a reference signal having a wavelength &lgr;; an etalon for receiving the optical data signal and the reference signal, the etalon having a free spectral range (FSR) and including a first partially reflective surface and a second partially reflective surface spaced apart by a length l for forming a resonant cavity for a signal having a wavelength substantially equal to &lgr;; a tunable grating optically disposed between the first and second reflective surfaces of the etalon for successively reflecting one channel at a time from the optical data signal; a first detector for measuring an output of the tunable grating; and a second detector for measuring an output of the etalon.