Patent ID: 6067181
Filing Date: 2000-05-23
Classification: H01S,H04B,H04J

Abstract:
An optical device comprising:a source of light;an optical transfer element having a first port coupled to said source of light, said first port receiving said light, said transfer element having a second port for outputting said light and receiving, as an input, a first portion of said light associated with a particular wavelength, said transfer element having a third port for outputting said first portion of said light so that said first portion of light propagates away from said source of light;a filtering element coupled to said second port of said transfer element, said filtering element having a transmissivity characteristic and a reflectivity characteristic as a function of wavelength, said filtering element configured to receive said light and reflect said first portion of said light toward said second port of said transfer element, said filtering element configured to transmit a second portion of said light associated with one or more wavelengths outside of said particular wavelength;a photodetector coupled to said filtering element, said photodetector receiving said second portion of said light and generating a sense signal in response thereto; anda control circuit coupled to said photodetector and to said source of light, said control circuit receiving said sense signal from said photodetector and generating a control signal, based on said sense signal, for controlling said light outputted from said source.