Optical modulator and controlling method and apparatus thereof

  • US 20090244685A1
  • Filed: 11/19/2008
  • Published: 10/01/2009
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
Patent Images

1. An optical modulator that performs quadrature amplitude modulation with respect to an input light and outputs the quadrature amplitude modulated light, comprising:

  • an optical branching section that branches an input light into (2×

    N) lights (where N is an integer equal to or larger than

         2);

    (2×

    N) phase modulating sections that respectively modulate the phase of respective lights branched by the optical branching section;

    an optical coupling section that couples the phase-modulated lights output from the respective phase modulating sections and outputs quadrature amplitude modulated signal light having a 4N value; and

    an optical phase adjusting section that relatively adjusts, with respect to an optical phase of specific two phase-modulated lights of the phase-modulated lights output from the respective phase modulating sections, the optical phase of the remaining (2×

    N−

    2) phase-modulated lights.

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