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Methods and circuits for controlling drive mechanisms

  • US 7,899,096 B1
  • Filed: 10/30/2009
  • Issued: 03/01/2011
  • Est. Priority Date: 10/30/2009
  • Status: Expired due to Fees
First Claim
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1. A method for aligning an optical package comprising a semiconductor laser operable to emit an output beam with a first wavelength, a wavelength conversion device operable to convert the output beam to a second wavelength, adaptive optics configured to optically couple the output beam into a waveguide portion of an input facet of the wavelength conversion device, a control circuit comprising a first resistive element and a second resistive element, and a drive mechanism coupled to the adaptive optics and configured to adjust a position of the output beam on the input facet, the method comprising:

  • applying an advancement waveform to the drive mechanism using the first resistive element to perform an advancement operation during which the drive mechanism advances the adaptive optics in an adjustment direction; and

    applying a dither waveform to the drive mechanism using the second resistance element to perform a dither operation during which the drive mechanism oscillates the adaptive optics back and forth in first and second directions to oscillate a position of the output beam on the input facet;

    wherein a polarity of the advancement waveform corresponds with the adjustment direction, and the first and second resistive elements are such that a rising edge time and a falling edge time of the dither waveform is greater than a rising edge time and a falling edge time of the advancement waveform.

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