Patent ID: 11947237
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. The semiconductor Mach-Zehnder optical modulator according to claim 13, further comprising:
a first ground line along a propagation direction of the modulation signal on the dielectric layer outside the first input side lead-out line, the first phase modulation electrode line, and the first output side lead-out line; and
a second ground line along the propagation direction of the modulation signal on the dielectric layer outside the second input side lead-out line, the second phase modulation electrode line, and the second output side lead-out line, wherein:
in a portion of the first and second output side lead-out lines, a width of the at least one semiconductor layer in a direction perpendicular to the propagation direction of the modulation signal is equal to or more than a distance between the first and second ground lines, and
the at least one semiconductor layer is disposed below edges of the first and second ground lines, the edges of the first and second ground lines being closer to respective output side lead-out lines than other edges of the first and second ground lines.