Patent ID: 7907324
Filing Date: 2011-03-15
Classification: G02F,H04B

Abstract:
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 4 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.