Silicon-based integrated optical isolation device based on topology protection mechanism

Abstract

The invention belongs to the field of integrated optics, and particularly relates to a silicon-based integrated optical isolation device based on a topology protection mechanism. By adjusting the boundary states of the linear defect photonic crystal module and the topological non-uniform low group velocity photonic crystal module, the excitation and coupling regulation and control of the low groupvelocity boundary state are realized. According to the invention, the line defect photonic crystal waveguide with low group velocity is used as a transition coupling structure, so that the group velocity is matched while the coupling loss is reduced. The boundary state propagated in the photonic crystal has low group velocity and good locality, so that the size of the device is greatly reduced, and the loss is low; an isolator of TE polarization can be conveniently obtained; and in addition, steep bending transmission can be obtained through design. The invention provides a new mechanism of the optical isolation device; the processing tolerance can be obviously improved, and the stability and the expansibility are good; the design may be on-chip integrated using a semiconductor process.

Description

technical field [0001] The invention belongs to the field of integrated optics, in particular to a silicon-based integrated optical isolation device based on a topology protection mechanism. Background technique [0002] The optical isolator integrated on the chip in integrated optics has the characteristics of one-way conduction, which can suppress optical communication, and the reflected light in the optical interconnection system enters the laser, which significantly reduces the intensity and phase noise of the device. Traditional optical isolators are usually discrete devices, which are bulky, expensive to manufacture, and difficult to integrate. They cannot be mass-produced at low cost by using semiconductor production methods like non-reciprocal devices in circuits. [1] . [0003] Topological photonics provides new ideas for the development of integrated optical isolators. Topological photonics is an emerging discipline that combines traditional optical research with ...

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Problems solved by technology

[0010] In view of the above-mentioned problems, in order to solve the technical problem that the existing optical isolation devices cannot realize non-trivial topologica...

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