Patent ID: 6061158
Filing Date: 2000-05-09
Classification: H04B

Abstract:
A high-capacity wavelength division multiplexer, comprising:an optical dispersive device;means for directing multiple light beams of different wavelengths onto the dispersive device at wavelength-dependent angles of incidence, wherein the dispersive device provides a composite output beam including multiple beams at the different wavelengths propagating along a substantially common path;a tunable optical bandpass filter positioned to receive at least a portion of the composite beam;means for tuning the optical bandpass filter to successive settings corresponding to the different wavelengths of the multiple light beams;a sensor, positioned to provide a measure of beam angle difference from the common light path for successive beams emitted from the tunable optical bandpass filter, the measure of beam angle difference being indicative of wavelength error; andmeans for generating a light source control signal from each measure of beam angle difference provided by the sensor, for wavelength correction.