Patent ID: 7593647
Filing Date: 2009-09-22
Classification: H04B

Abstract:
1. An apparatus, comprising: an optical transmitter having a resonance wavelength characteristic that varies with a refractive index of the optical transmitter, wherein the optical transmitter receives a narrow band injected wavelength signal from an incoherent light source; a controller that substantially matches a resonant wavelength of the optical transmitter to the wavelength of the injected wavelength signal by changing the refractive index of the optical transmitter; and a detector to measure a parameter of the optical transmitter to provide a feedback signal to the controller to control the refractive index of the optical transmitter, wherein the detector measures the parameter to detect a local dip in an increasing trend of the parameter indicating that the resonant wavelength of the optical transmitter and the wavelength of the injected wavelength signal are substantially matched.