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Thermal compensation in semiconductor lasers

  • US 20080063016A1
  • Filed: 09/13/2006
  • Published: 03/13/2008
  • Est. Priority Date: 09/13/2006
  • Status: Abandoned Application
First Claim
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1. A method of compensating for thermally induced patterning effects in a semiconductor laser, said method comprising:

  • driving an active region of said semiconductor laser with a laser driving current ID sufficient to generate stimulated emission of photons in said active region;

    generating a modulated laser output signal Pλ

    by driving said active region of said semiconductor laser with relatively high magnitude and relatively low magnitude laser driving currents ID;

    heating said active region of semiconductor laser with a heating element driving current IH to generate heat in a heating element structure thermally coupled to said active region; and

    controlling a junction temperature TJ of said active region by driving said heating element with relatively high magnitude and relatively low magnitude heating element driving currents IH, wherein said control of said laser driving current ID and said control of said heating element driving current IH are such thatsaid heating element driving current IH is at said relatively high magnitude when said laser driving current ID is at a relatively low magnitude for at least a portion of a duration over which said heating element is driven by said heating element driving current IH, andsaid heating element driving current IH decreases from said relatively high magnitude to said relatively low magnitude at a time prior to an increase in said laser driving current ID from said relatively low magnitude to said relatively high magnitude.

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