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Reflective mechanical long-period fiber grating bandpass filter

A band-pass filter and fiber grating technology, applied in light guides, optics, instruments, etc., can solve the problems of non-adjustable filtering characteristics and single function, and achieve the effect of convenient filtering effect

Pending Publication Date: 2018-11-23
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In short, the current long-period fiber grating filter has the disadvantages of single function and non-adjustable filtering characteristics.

Method used

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  • Reflective mechanical long-period fiber grating bandpass filter
  • Reflective mechanical long-period fiber grating bandpass filter

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] refer to figure 1 , a reflective mechanical long-period fiber grating bandpass filter, including a cored fiber 101, a hollow core fiber 102, an end reflector 103, a winding wire 104, a thermally conductive cylindrical sleeve 105 and a heating rod 106, and a cored fiber 101 Placed on the heat-conducting cylindrical sleeve 105, the heating rod 106 is placed inside the heat-conducting cylindrical sleeve 105, the cored optical fiber 101 and the thermally-conducting cylindrical sleeve 105 are wound together by the winding wire 104, and the hollow-core optical fiber 102 and the cored optical fiber 101 are fused together , an end reflector 103 is provided at the end face of the output end of the hollow-core optical fiber 102 .

[0019] Furthermore, the winding wire 104 is a material with a large coefficient of thermal expansion and good elasticity. Still further, the...

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Abstract

A reflective mechanical long-period fiber grating bandpass filter comprises a cored optical fiber, a hollow core optical fiber, a heat conducting cylindrical sleeve, a wound wire, a heating rod and anend reflector, wherein the cored optical fiber is placed on the heat conducting cylindrical sleeve, the heating rod is placed inside the heat conducting cylindrical sleeve, and the wound wire is wound around the cored optical fiber and the heat conducting cylindrical sleeve to bind the two together. The hollow core optical fiber and the cored optical fiber are connected through welding; the diameter of a central hole of the hollow core optical fiber is equal to the diameter of the fiber core of the cored optical fiber, and the outer layer diameter of the hollow core optical fiber is equal tothe outer diameter of the cored optical fiber cladding; the end reflector is disposed at the output end face of the hollow core optical fiber. The reflective mechanical long-period fiber grating bandpass filter has the advantages of tunable resonant wavelength, controllable mode coupling strength and erasable grating.

Description

technical field [0001] The invention relates to the field of optical fiber sensing and optical communication passive devices, in particular to a mechanical long-period fiber grating (MLPFG) band-pass filter. Background technique [0002] The grating filter is an optical device used for wavelength selection, which can select the required wavelength from many wavelengths. With the development of optical communication technology, the grating filter, as an indispensable key device in the wavelength division multiplexing (WDM) optical fiber network, is one of the key network elements in the wavelength division multiplexing optical network. Since LPFG with a period of hundreds of microns was first written on an optical fiber in 1996, LPFG has played an increasingly important role in the field of optical communication due to its advantages such as simple fabrication, easy connection, low insertion loss, and no back reflection. effect. In addition, LPFGs are sensitive to changes i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293
CPCG02B6/29317G02B6/29395
Inventor 张明郑健王笑李加坡杜颖
Owner ZHEJIANG UNIV OF TECH
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