| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical modulator including a ridge type optical waveguide and an eaves-like signal electrode and capable of performing high speed operation.SOLUTION: An optical modulator 100 includes: a ridge type optical waveguide 5; and a modulation electrode 15. The modulation electrode 15 comprises: a signal electrode 7 to which a modulation signal is supplied; a first ground electrode 11; and a second ground electrode 12. The signal electrode 7 includes a wide width part 7W having width wider than the width W5 of an uppermost part of the ridge type optical waveguide 5, the first ground electrode 11 includes a center part ground electrode element 11C formed on a first surface 3A so as to be extended along a first direction and the second ground electrode 12 includes a center part ground electrode element 12C formed on a second surface 3B so as to be extended along the first direction. The center part ground electrode element 11C and the center part ground electrode element 12C respectively include first through holes 11B and second through holes 12B and are overlapped to the wide width part 7W of the signal electrode 7 in plane view. |
