Patent ID: 6654514
Filing Date: 2003-11-25
Classification: G02B

Abstract:
An optical interleaver for separating an input DWDM signal occupying a nominal frequency band into two output signals, one comprising a plurality of odd optical channels and the other comprising a plurality of even optical channels within said frequency band, said interleaver comprising, in combination:a) a first optical fiber having opposed ends; b) a second optical fiber having opposed ends; c) said first and second fibers being fused together to form first and second couplers to thereby define an input section before said first coupler, an interferometer section between said first and second couplers and an output section after said second coupler; d) a first tap coupler within said input section for receiving a monitor signal having a nominal frequency; e) a second tap coupler within said output section for providing an interleaver output signal; f) an optical path length adjustment element for shifting said monitor signal in frequency space, said optical path length adjustment element being responsive to a feedback signal; g) a circuit for generating said feedback signal; and h) said circuit being responsive to said output signal.