Patent ID: 7729397
Filing Date: 2010-06-01
Classification: G02F,H01S

Abstract:
1. A method for controlling an optical package comprising a semiconductor laser, a wavelength conversion device, adaptive optics configured to optically couple an output beam of the semiconductor laser into a waveguide portion of an input facet of the wavelength conversion device, an optical detector, and a package controller programmed to operate the semiconductor laser and at least one adjustable optical component of the adaptive optics, the method comprising: controlling the periodic lasing intensity of the semiconductor laser by controlling an amount of gain current I supplying a wavelength control signal to a wavelength selective section of the semiconductor laser to control a lasing wavelength λ positioning the output beam on the input facet of the wavelength conversion device by supplying a position control signal to the adjustable optical component; supplying a modulated wavelength feedback control signal to the wavelength selective section to modulate the lasing wavelength λ where v λ is the frequency of the modulated wavelength feedback control signal, N is an integer and P is an integer greater than one; supplying a modulated position feedback control signal to the adjustable optical component to modulate the position of the output beam on the input facet of the wavelength conversion device, wherein the modulated position feedback control signal is out of phase with the modulated wavelength feedback control signal and a frequency v measuring a response parameter of the wavelength conversion device; analyzing the measured response parameter of the wavelength conversion device to identify spectral and positional components attributable to the modulated wavelength feedback control signal and modulated position control signal; adjusting the wavelength control signal based on the spectral component of the measured response parameter to optimize the response parameter of the wavelength conversion device; and adjusting the position control signal based on the positional component attributable to the modulated position control signal to optimize the response parameter of the wavelength conversion device.