A thermally wavelength tunable laser having selectively activated gratings includes a core, more than one periodic arrangement adjacent to the core, and thermo-optical material adjacent to each periodic arrangement. At an off temperature, the refractive index of the periodic arrangement and the adjacent...http://www.google.com/patents/US6647032?utm_source=gb-gplus-sharePatent US6647032 - Thermally wavelength tunable laser having selectively activated gratings
