Rotary writing method of multi-core fiber grating

Abstract

The invention provides a rotary writing method of a multi-core fiber grating, which comprises the following steps of stripping one section of coating on a multi-core fiber; fixing the multi-core fiber on a fiber fixture after cleaning treatment; arranging the fiber fixture on a rotary optical device; tightly attaching the multi-core fiber to a mask; regulating the rotary optical device so that one fiber core aligns with a writing optical source; starting an excimer laser, and conducting exposure after the optical source becomes parallel light through collimating and beam expanding; connecting one end of the multi-core fiber to a broadband optical source, and connecting the other end to a spectrograph; monitoring grating formation through the spectrograph, and stopping exposure after achieving the required reflectivity; regulating the rotary optical device to a proper angle so that the next fiber core of the multi-core fiber rightly aligns with the writing source for writing fiber by fiber; and packaging. The invention has the advantages of simple implementation and easy control, and can improve the writing quality of the grating; a plurality of manufactured multi-core fiber gratings are integrated in one fiber, which improves the integration of optical devices in the fiber and can be used for simultaneously measuring a plurality of physical quantities and multi-dimension information.

Description

technical field [0001] The invention belongs to the technical fields of optical fiber communication and optical fiber sensing, and relates to a manufacturing technology of a multi-core optical fiber grating. Background technique [0002] A typical optical fiber is a single-core structure, and the cladding surrounds the core to form a cylindrical optical waveguide. The multi-core optical fiber contains multiple cores in the same outer cladding, and each core is surrounded by a cladding material. Therefore, each fiber core is a fiber waveguide, that is, multiple single-core fibers are integrated in a multi-core fiber. The concept of multi-core optical fiber was proposed as early as the end of the 1970s. The purpose is to simultaneously solve the two major problems of reducing the manufacturing cost of optical fiber cables and developing high-density and large-core optical cables. However, it was not until the 1990s that with the continuous development and improvement of opti...

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Problems solved by technology

[0004] At present, both the theoretical analysis and the manufacturing process of single-core fiber gratings are quite mature, but most of the non-same-plane multi-core fiber gratings use one-side exposure technology [W.N.MacPherson, Meas.Sci.Technol.15, 1642, 2004 and the United States Patent No.20070201793A1], multiple core gratings are written at one time. The gratings produced by this preparation method have inconsistent grating pitches of different cores, and the reflection peaks of each grating are also different. The cores farther away from the writing beam , the refractive index changes very little, the reflection peak is small, the resonance wavelength is also long, and multiple gratings satisfy a fixed relationship, the tunability is poor, and the prism effect of the fiber itself also affects the characteristics of each grating

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