Patent ID: 11940707
Assignee: SHANGHAI JIAO TONG UNIVERSITY
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A high-speed and low-voltage electro-optical modulator with a Mach-Zehnder interference structure based on a lithium niobate-silicon wafer, comprising, as arranged from bottom to top,
a silicon substrate layer,
a silicon dioxide isolation layer,
a lithium niobate wafer layer, and
a silicon waveguide layer,
wherein the silicon waveguide layer is etched to form multimode interferometers, a phase shifting arm, spot-size converters, DC bias electrodes, and traveling-wave electrodes;
a high refractive index region, a spot-size conversion region, an electro-optical modulation region, a spot-size conversion region, and a high refractive index region are sequentially formed from an input end to an output end;
the phase shifting arm comprises thermal modulation phase shifters and electrical modulation phase shifters;
the multimode interferometers and the thermal modulation phase shifters are located in the high refractive index regions;
the spot-size converters are located in the spot-size conversion region, and the electrical modulation phase shifters are located in the electro-optical modulation region;
the multimode interferometers, the phase shifting arm, and the spot-size converters constitute a waveguide structure component;
the DC bias electrodes are formed near the thermal modulation phase shifters; and
the traveling-wave electrodes are formed near electrical modulation phase shifters.