Patent ID: 6993055

Claim:
A resonant cavity device array for WDM application, comprising: a substrate; a plurality of oxidation-confined resonant cavity devices with different wavelengths formed on said substrate; each of the oxidation-confined resonant cavity devices having a selective oxidation structure; the selective oxidation structure containing a plurality of Al x Ga 1-x As oxidation tuning layers for forming AlGaO during an oxidation process, thereby changing the refractive index and thickness of a partial area of the Al x Ga 1-x As oxidation tuning layer; the resonant wavelength of each of the oxidation-confined resonant cavity devices having different oxidation extent in the Al x Ga 1-x As oxidation tuning layer with some resonant cavity devices having tuning layers completely oxidized, some resonant cavity devices having tuning layers not completely oxidized and some resonant cavity devices having some tuning layers which are oxidized and some tuning layers which are not oxidized, the propagation constant being determined by the number of tuning layers which are completely oxidized.