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Optical transmitter

  • US 20070110453A1
  • Filed: 03/01/2006
  • Published: 05/17/2007
  • Est. Priority Date: 11/15/2005
  • Status: Active Grant
First Claim
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1. An optical transmitter comprising:

  • a directly modulated laser; and

    a wavelength filter provided on a post-stage of said directly modulated laser, wherein, said wavelength filter has;

    a modulated light input port connected to said directly modulated laser and inputting modulated light output from said directly modulated laser;

    a filter transmitted light output port connected to an optical coupling system and outputting light having a wavelength included in a filter transmission band among said modulated light as filter transmitted light; and

    a filter cutoff light output port provided separately from said modulated light input port and said filter transmitted light output port and outputting light having a wavelength included in a filter cutoff band among said modulated light as filter cutoff light, and wherein the peak of said filter transmission band is set on a shorter-wave side from the peak of the spectrum of modulated light output from said directly modulated laser.

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