| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical modulator in which a drive circuit can be simplified significantly, and to provide an optical modulation module that uses the optical modulator. SOLUTION: The optical modulator comprises an input-side single-mode waveguide 1 where light enters; a beam-splitting section 5 for splitting the beam entering the input-side single-mode waveguide 1 into two beams; a phase-modulating section, having a pair of waveguide arms 2a, 2b which transmit the light split into two beams by the beam-splitting section 5, and modulation electrodes 3a, 3b, disposed overlapping the waveguide arms 2a, 2b; a recombining section 6 recombining the light beams which the waveguide arms 2a, 2b have transmitted; and an output-side single-mode waveguide 4, where the light recombined in the recombining section 6 exits. In the phase-modulating section, the waveguide arms 2a, 2b have refractive indices different from each other so as to induce aπ/2 shift between the two waveguide arms 2a, 2b. COPYRIGHT: (C)2009,JPO&INPIT
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