Programmable Fiber Bragg Grating Based on Magnetic Fluid

Abstract

The invention provides a programmable optical fiber grating based on magnetic fluid. It is characterized in that it consists of a user control terminal 1, a constant current source 2, a grating period control system 3, a micro electromagnet control array 4, a capillary fiber 5, a magnetic fluid 6 and a micro electromagnet patch array 7. The invention can be used in the manufacture of optical fiber grating devices with controllable grating periods, such as optical filters, dispersion compensators and optical fiber delay devices, and can be widely used in the fields of optical fiber sensing and optical fiber communication.

Description

(1) Technical field [0001] The invention relates to a programmable fiber grating based on magnetic fluid, which can be used in the manufacture of fiber grating devices with controllable grating period, such as optical filters, dispersion compensators and fiber delay devices, etc., belonging to optical fiber sensing and Optical fiber communication technology field (2) Background technology [0002] Fiber Bragg grating is a kind of passive optical device with fixed spatial phase by causing the refractive index of the fiber core to change periodically along the core axis through external perturbation. The corresponding change in intensity spatial distribution is equivalent to forming a narrowband (transmission or reflection) filter or mirror in the fiber core, with excellent wavelength selectivity, low additional loss, wide bandwidth range and good coupling characteristics. . [0003] At present, due to the advantages of small size, small splicing loss, and the ability to emb...

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Problems solved by technology

[0004] Usually, when fiber gratings are applied to the above-mentioned devices, it is necessary to set a fixed wavelength and grating pitch first, so as to complete the production of a grating, so it can only be used in specific occasions or fixed devices, which limits the fiber grating type. Applications of Optical Devices

[0005] Taking the most widely used fiber Bragg gratings and long-period fiber gratings as examples, whether it is a uniform fiber grating or a non-uniform fiber grating, once the production is completed, the grating period cannot be changed, that is, the grating period cannot be adjusted according to the actual situation. , can only be used in specific situations, which greatly limits the scope of use of a single fiber grating

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