Patent ID: 6369926
Filing Date: 2002-04-09
Classification: H04B

Abstract:
In an apparatus capable of stabilizing a wavelength and a light strength of a multichannel light source, the improved apparatus comprising:temperature control means for controlling a temperature variation of the light source in accordance with a first input signal so as to stabilize the wavelength; first optical coupling means for dividing an output signal of the light source; wavelength locking means for receiving a light divided by the first optical coupling means, detecting a wavelength difference between the wavelength of the received light and a set wavelength and converting the detected wavelength difference into a first electrical signal; error detection means for receiving the first electrical signal, detecting a sum and difference of successive first electrical signals, amplifying the sum and difference, dividing the difference by the sum, and generating an error signal; first proportional/integrator means for receiving the error signal from the error detection means, detecting a value proportional to the error signal, integrating the detected proportional value, and generating the first input signal for the temperature control means; current control means for providing the light source with a current for controlling the light strength of the light source in accordance with a second input signal so as to stabilize the light strength; second optical coupling means for dividing the output signal from the first optical coupling means; photodetector means for converting the light strength of an output signal from the second optical coupling means into a second electrical signal; and second proportional/integration means for detecting a proportional value of the output signal from the photodetector means, integrating the detected proportional value, and generating the second input signal for the current control means.