An optical device includes an optical waveguide through which light propagates and a micro-resonator structure including an optical sensor. The micro-resonator is configured to resonate at a wavelength of light that may be transmitted through the optical waveguide. When light at that wavelength is transmitted...http://www.google.com/patents/US6985644?utm_source=gb-gplus-sharePatent US6985644 - Semiconductor micro-resonator for monitoring an optical device
