Reflection compensation type high-density multi-core fiber bragg grating preparation system

Abstract

The invention provides a reflection compensation type high-density multi-core fiber bragg grating preparation system. The system comprises an ultraviolet laser, an ultraviolet reflector, a beam expander, a diaphragm, a cylindrical lens, a mask plate, an optical fiber clamp, a compensation reflector and a three-dimensional adjusting frame. According to the high-density multi-core fiber bragg grating preparation system provided by the invention, forward ultraviolet light passing through the phase mask plate is reflected back to the optical fiber through the compensation reflector so as to compensate the situation of ultraviolet light loss in an irradiation area caused by the cylindrical surface effect of the optical fiber. According to the invention, the light field distribution of the inscribing light beam on the cross section of the optical fiber can be effectively improved, and the preparation of the high-density multi-core optical fiber and other special-shaped core optical fiber gratings is realized.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of fiber grating preparation, in particular to a reflection compensation type high-density multi-core fiber grating preparation system. [0003] (2) Background technology [0004] Fiber grating refers to a spatially periodic refractive index distribution established in the fiber core, and its function is to change or control the propagation behavior and mode of light in this area. Single-mode fiber Bragg grating (FBG) is a relatively mature fiber grating at present. This type of grating has excellent optical narrow-band filtering and sensing characteristics, because of its simple fabrication, low cost, good stability, and small size. , has been widely used in the field of optoelectronics and fiber optic sensing. In recent years, in order to meet the needs of communication and sensing, many special optical fiber structures have been designed and fabricated, such as large-core optical fiber, multi-c...

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Problems solved by technology

This method needs to rotate the optical fiber to be written while writing. The slight asymmetry of the optical path or the slight vibration of the rotating motor will affect the writing effect of the FBG. The requirements for the environment are relatively strict and it is difficult to manufacture.

Patent CN111552023A proposes a method of manufacturing a semicircular compensation plate, which can offset the cylindrical effect of the optical fiber by bonding a semicircular compensation plate to the optical fiber, but this method requires the compensation plate to be bonded to the mask. It will cause damage to the mask, and at the same time, it is more complicated to make a semicircular groove on the plate that can fit the optical fiber, and the cost is relatively high

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