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Optical transmitter module

  • US 10,187,157 B2
  • Filed: 02/27/2017
  • Issued: 01/22/2019
  • Est. Priority Date: 03/02/2016
  • Status: Active Grant
First Claim
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1. An optical transmitter module, comprising:

  • a semiconductor laser for irradiating a laser beam;

    a demultiplexer for branching the laser beam to output a plurality of branched light beams;

    a plurality of optical modulators for modulating an optical amplitude of each of the plurality of branched light beams into a first optical amplitude or a second optical amplitude stronger than the first optical amplitude, depending on an input level at two levels; and

    a multiplexer for multiplexing output light beams from the plurality of optical modulators,wherein;

    the demultiplexer is a multimode interferometer, andthe demultiplexer includes a first multimode interferometer for branching the laser beam to output an N number (N being an integer equal to or greater than three) of branched light beams, and a second multimode interferometer for multiplexing an M number (M being an integer equal to or greater than two,wherein M<

    N) of branched light beams among the N number of branched light beams.

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