Patent ID: 8576472

Claim:
A device which is composed of: (a) a reflector providing at least one reflectivity stopband, (b) a gain region with means of generating optical gain introduced into at least one layer of said reflector, (c) a gain spectrum of said gain region overlapping with the reflectivity stopband of said reflector, (d) a passive optical cavity attached to said reflector such that a small fraction of the optical field of the passive cavity optical mode penetrates into the gain region placed in the reflector, wherein said passive optical cavity has a resonance wavelength, and wherein a requested temperature dependence of said resonance wavelength of the said optical mode is realized, wherein said requested temperature dependence is selected from the group including (i) a positive thermal shift of said resonance wavelength, and (ii) a negative thermal shift of said resonance wavelength; and wherein each of the possibilities of (i) through (ii) can be realized.