Patent ID: 6965622

Claim:
An optical device, comprising: an optical source, said optical source being configured to emit light; wavelength adjusting circuitry operatively coupled to said optical source, said wavelength adjusting circuitry being configured to control a wavelength of said optical source in response to a control signal; an optical filtering element optically coupled to said optical source, said optical filtering element having a wavelength dependent transmission characteristic; optical-to-electrical conversion circuitry optically coupled to said optical filtering element, said optical-to-electrical conversion circuitry being configured to output electrical signals in response to said light, said optical-to-electrical conversion circuitry including first and second photodetectors, said first photodetector being configured to detect a first portion of said light from said filtering element, and said second photodetector being configured to detect a second portion of said light; and temperature sensor circuitry spaced from said optical source, said temperature sensor circuitry being configured to output a sense signal indicative of a temperature at a location spaced from said optical source; control circuitry coupled to said wavelength adjusting circuitry and said temperature sensor circuitry, said control circuitry being configured to supply said control signal to said wavelength adjusting circuitry, wherein said control circuit generates said control signal in response to said sense signal and a first quotient of a first value of a first electrical signal generated by said first photodetector and a second value of a second electrical signal generated by said second photodetector said wavelength adjusting circuit adjusting a wavelength of said light such that said control circuit determines a second quotient of a third value of a third electrical signal generated by said first photodetector and a fourth value of a fourth electrical signal generated by said second photodetector, said second quotient substantially corresponding to a predetermined ratio associated with said temperature.