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Variable wavelength light source, optical module and manufacturing method of variable wavelength light source

  • US 8,249,405 B2
  • Filed: 01/28/2009
  • Issued: 08/21/2012
  • Est. Priority Date: 02/01/2008
  • Status: Active Grant
First Claim
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1. A variable wavelength light source, comprising:

  • a multiple resonator including a plurality of ring resonators having throughports, which have different circumference lengths from each other and are coupled mutually;

    a plurality of photodetectors which detect light powers outputted via the respective throughports of the plurality of ring resonators;

    a plurality of variable light units for changing transmittance of the multiple resonator by individually working on the plurality of resonators;

    a light input/output unit which supplies light to the multiple resonator and emits light returned from the multiple resonator towards outside;

    a control unit which controls the plurality of variable light units based on the light powers detected by the photodetectors; and

    light attenuators provided between the throughports and the photodetectors for attenuating the light emitted from the throughports before making incident on the photodetectors.

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