Light circulator based on space-free directional coupled structure

Abstract

The invention discloses an optical circulator based on a non-spacing directional coupling structure. The invention is formed by orderly and serially connecting an input Y-branch waveguide, a rectangular dual-mode waveguide provided with magnetic material, and an output Y-branch waveguide on a substrate. The proposal of the invention is to adopt the non-spacing directional coupling structure and utilize the non-reciprocal phase shift difference principle of a basic mode and a one-off pattern thereof to realize the integration of an optical isolator and the optical circulator through the non-reciprocal phase shift. The non-reciprocal device has the characteristics of compact structure and high integration level, has application prospect in aspects such as emission, amplification, transmission, and routing of light signals and so on, and has scientific research significance and application value.

Description

technical field

[0001] The invention relates to a device for controlling the direction of light, in particular to an optical circulator based on a directional coupling structure without spacing. Background technique

[0002] In optical information systems such as optical fiber communication, the connection of different devices often reflects a part of the light. Once the reflected light enters the cavity of the laser source, it will cause parasitic oscillation of the light source, affect the frequency stability of the light source, and limit its modulation bandwidth. Thereby limiting the improvement of the overall system performance. Optical isolator (Optical Isolator) is a magneto-optical non-reciprocal device specially developed to solve this problem. So far, practical optical isolators include bulk optical isolators using bulk garnet crystals as Faraday rotators and micro-optical devices with reduced size. However, as an integrated optical optical isolator, it is still ...

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