| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical control device in which the crosstalk between input-side signal electrodes of electrodes for modulation is suppressed.SOLUTION: The optical control device includes: first and second optical waveguides 31 and 32; a first signal electrode 5 for control having a first input-side signal electrode 53; a second signal electrode 7 for control having a second input-side signal electrode 73; a ground electrode 13 between signal electrodes; a first ground electrode 11; and a second ground electrode 12. A substrate 1 includes: a first groove D1 disposed between the first input-side signal electrode 53 and the second input-side signal electrode 73; a second groove D2 disposed between the first input-side signal electrode 53 and the first ground electrode 11; a third groove D3 disposed between the second input-side signal electrode 73 and the ground electrode 13 between signal electrodes; and a fourth groove D4 disposed between the second input-side signal electrode 73 and the second ground electrode 12. |
