公开(公告)号：US12222628B2

公开(公告)日：2025-02-11

申请号：US18312593

申请日：2023-05-05

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Jing Xu ,  Hanghang Li ,  Xinliang Zhang

IPC: G02F1/35

Abstract: A nonlinear optical device includes two coupling systems. A coupling coefficient between the two coupling systems is regulated and controlled. During operation, the pump light input from a straight waveguide is coupled into the second coupling system through the first coupling system and obtains great resonance enhancement in the second coupling system, so it is ensured that the second coupling system is in a high energy state. For signal light input from the same end of the straight waveguide, the signal light enters a resonator of the second coupling system through the coupling between the first and second coupling systems. A nonlinear effect of the system mainly occurs in the resonator of the second coupling system because in the resonator of the second coupling system, the pump light is in a great resonance enhancement. The entire resonator is in a high energy state.

公开(公告)号：US20220197064A1

公开(公告)日：2022-06-23

申请号：US17396350

申请日：2021-08-06

Applicant: Huazhong University of Science and Technology

Inventor： Janji Dong ,  Yanxian Wei ,  Hailong Zhou ,  Xinliang Zhang

IPC: G02F1/00 ,  G02F1/01 ,  G02F1/025

Abstract: The present invention belongs to the field of integrated optical waveguide modulation, and specifically, relates to an ultra-close-range metallic heater thermo-optic phase shifter, which includes: a substrate, and a metallic heater and an optical waveguide respectively arranged on the substrate; in which the metallic heater and the optical waveguide are arranged at a close distance, and the distance is less than 600 nm. The material of the metallic heater is titanium, titanium nitride, aluminum, gold, and/or a metal with a larger imaginary part of the refractive index. The present invention includes two solutions: side heating and top surface heating. In the side heating solution, the heater is placed close to a side of the waveguide in parallel, and heat is conducted to the optical waveguide through the substrate to achieve thermo-optic phase shift; while in the top surface heating solution, an auxiliary waveguide is placed on a side of the optical waveguide, and the heater is placed above the auxiliary waveguide; heat is conducted to the optical waveguide through a top silicon oxide layer to achieve thermo-optic phase shift. The present invention utilizes the principle of parity-time symmetry, greatly shortens the distance between the heaters and the waveguide, realizes low-loss and high-rate thermo- optic modulation. In addition, it is compatible with the CMOS process, and is a standard process.