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Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating

A technology of multi-mode fiber and double filtering, applied in the field of optical fiber, can solve the problem that the multi-mode fiber grating spectrum cannot be stabilized, and achieve the effects of high stability and controllability, simple structure and low cost

Inactive Publication Date: 2012-12-19
HARBIN ENG UNIV
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Problems solved by technology

However, the distribution of various modes in multimode fiber will change with factors such as excitation conditions and fiber bending, so the spectrum of multimode fiber gratings cannot be stabilized.

Method used

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  • Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating
  • Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating
  • Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating

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Embodiment Construction

[0018] The structure of the double-filter microstructure beam splitter based on single-mode-multimode fiber grating is as follows figure 1 As shown, it includes a broadband light source 1 , a single-mode fiber 2 , a joint surface 3 between a single-mode and a multimode fiber, a multimode fiber 4 , a writing long-period grating 5 , and a CCD detection device 6 .

[0019] The wide-spectrum light source 1 is connected to the input end of the single-mode fiber 2, and the output end of the single-mode fiber 2 is connected to the input end of the multimode fiber 4, and the two are coupled to form a single-mode and multi-mode fiber interface 3, which is written in the multimode fiber 4 A long-period grating is inserted, and the output end of the multimode fiber 4 is connected to a CCD detector.

[0020] After the light emitted by the broadband light source 1 enters the single-mode fiber 2, the single-mode light field in the single-mode fiber will be coupled into the multimode fiber 4...

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Abstract

The invention belongs to the technical field of optical fibers, and particularly relates to a fiber bragg grating microstructure beam splitter with double filtering functions. A broad band optical source (1) is connected with an input end of a single mode optical fiber (2); an output end of the single mode optical fiber (2) is connected with an input end of a multimode optical fiber (4); a long-period fiber grating is written into the multimode optical fiber; and an output end of the multimode optical fiber (4) is connected with a CCD (Charge Coupled Device) detector. Diameter (d) of the core of the multimode optical fiber is less than 125 microns and more than or equal to 105 microns. The single mode optical fiber and the multimode optical fiber are connected by dislocation welding. The multimode optical fiber can be replaced by special optical fibers such as double-core optical fibers, annular-core optical fibers and three-core optical fibers. Compared with the method for simply writing the fiber grating into the multimode optical fiber, the beam splitter has high stability and controllability. The optical fiber material and the device are standard optical fiber communication elements, therefore, the beam splitter has the advantages of simple structure, small volume, low cost and high accuracy in comparison with the prior beam splitter.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and in particular relates to a fiber grating microstructure beam splitter with double filtering functions. Background technique [0002] Photons instead of electrons, and integrated optical circuits instead of integrated circuits will greatly improve the speed and ability of human beings to process information. It is one of the important goals of researchers in the field of optics to study and manufacture various functional optical devices and finally realize optical integration. Multimode fiber is the first fiber structure developed and applied by scientists. The internal mode interference causes the radial light field distribution of multimode fiber to change periodically with the axial distance of the fiber. The most extensive research on the multimode interference effect in multimode fiber is based on the single-mode-multimode-single-mode (SMS) fiber structure, that is, using the sing...

Claims

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Application Information

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IPC IPC(8): G02B6/293
Inventor 刘艳磊张建中彭石军孙伟民
Owner HARBIN ENG UNIV
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