All optical fiber nonreciprocal device and preparation method thereof

Abstract

The invention discloses an all optical fiber nonreciprocal device which comprises an optical fiber used for transmitting light and a reflecting film layer used for reflecting light, wherein the reflecting film layer is coated on the optical fiber and is located at a first light emitting window of the optical fiber, and an inclined fiber bragg grating is engraved on the core of the optical fiber; when incident light enters from one end of the optical fiber and passes through the fiber bragg grating, one part is emitted by the transmission of the fiber bragg grating, the other part is diffractedby the fiber bragg grating and then is reflected after being emitted by a first light outlet hole, and further is emitted after interfering with light transmitting the fiber bragg grating along an incidence direction; the incident light enters from the other end of the optical fiber and pass through the fiber bragg grating, one part is emitted by the transmission of the fiber bragg grating, and the other part is diffracted by the fiber bragg grating and then is emitted from a second light outlet hole; and transmission nonreciprocity of two directions is realized. The nonreciprocal device provided by the invention is simple and firm in structure, easy to produce, convenient for being integrated with other photoelectric devices, and capable of effectively solving the problem that a conventional optical fiber nonreciprocal device is limited by a magnetic field in a Faraday effect.

Description

technical field [0001] The invention relates to the technical field of integrated optoelectronics, in particular to an all-fiber non-reciprocal device and a preparation method thereof. Background technique [0002] Since 1978, Hill et al. of the Canadian Communications Research Center discovered that the fiber core doped with germanium is photosensitivity, and wrote the world's first fiber grating by using the standing wave formed by the bidirectionally propagating 488nm argon ion laser beam. It has achieved rapid development and has become an important fiber optic passive device, which is widely used in various fields such as fiber lasers, optical communications, and fiber optic sensing. In 1990, Meltz proposed the tilted fiber grating (TFBG) model for the first time. The grating plane of the tilted fiber grating is no longer perpendicular to the fiber axis, but has a certain angle of inclination, which in turn strengthens the coupling from the forward-transmitted core mod...

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Problems solved by technology

[0004] In view of the above-mentioned defects, the present invention provides an all-fiber non-reciprocal device and its preparation method, aiming to solve the technical problem that the existing non-reciprocal device has a large size due to the need for a strong magnetic field

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