Patent ID: 6937795

Claim:
An arrangement for wavelength locking each of a single or plurality of radiation sources that generate separate wavelength output signals, the arrangement comprising: a multiplexing/demultiplexing grating device for receiving the separate wavelength output signals from the plurality of radiation sources and generating a multiplexed wavelength output signal from the arrangement at a zero diffraction order output port of the grating device, and symmetric wavelength+δ and wavelength−δ output signals for each radiation source that are resolved at at least one separate predetermined location of a non-zero diffraction order of the grating device; a plurality of radiation detectors, each radiation detector being coupled to receive a separate one of the symmetric wavelength+δ and wavelength−δ output signals from a separate one of the plurality of radiation sources, and to generate an output signal representing the magnitude of the received wavelength output signal; and a control device responsive to output signals from each pair of radiation detectors that are coupled to receive the separate wavelength+δ and wavelength−{hacek over ((S)} output signals from a separate predetermined one of the plurality of radiation sources, for utilizing a signal ratio of the separate wavelength+δ and wavelength−δ output signals and generating therefrom a separate output control signal to each one of the plurality of radiation sources for locking the separate wavelength output signal thereof to a desired wavelength value.