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

Claim 11:
12. The semiconductor Mach-Zehnder optical modulator according to claim 11, wherein:
the attenuator includes a plurality of semiconductor layers;
in a portion of the output side lead-out line, a length of each of the plurality of semiconductor layers in a propagation direction of the modulation signal is ¼ or less of a guide wavelength of a maximum frequency in a band of the modulation signal;
a width of the plurality of semiconductor layers in a direction perpendicular to the propagation direction of the modulation signal is ¼ or less of the guide wavelength; and
a gap between the plurality of semiconductor layers in the propagation direction of the modulation signal is 50 μm or less.