A kind of fabrication method of mechanical long-period fiber grating

Abstract

A method for manufacturing a mechanical long-period fiber grating, comprising the following steps: Step 1, preparing an optical fiber and a winding wire; Step 2, preparing a heating rod and a heat-conducting cylindrical sleeve; Step 3, placing the optical fiber on the heat-conducting cylindrical sleeve, and conducting heat A heating rod is placed inside the cylindrical sleeve, and the winding wire wraps the optical fiber and the heat-conducting cylindrical sleeve together. After the optical fiber is subjected to periodic pressure exerted by the winding wire, a long-period fiber grating is formed; step 4, the heating rod can change the temperature, because the The degree of thermal expansion of the heat-conducting cylindrical sleeve and the winding wire is different, so that the winding of the winding wire is tightened or relaxed, so that the optical fiber can be subjected to different pressures, thereby controlling the coupling strength between the core and cladding modes, At the same time, the winding wire can change the resonant wavelength by changing the diameter of the winding wire. The invention has tunable resonance 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 manufacturing method of a mechanical long-period fiber grating (LPFG). Background technique [0002] The long-period fiber grating acts between the core guided mode and the cladding mode propagating in the same direction, and it couples the core guided mode to the cladding mode propagating forward to form a loss peak at the resonant wavelength, showing a transmission-type bandstop filter characteristics. LPFG is playing an increasingly important role in the field of optical communication due to its advantages of simple fabrication, easy connection, low insertion loss, and no back reflection. In addition, LPFGs are sensitive to changes in environmental parameters (refractive index, temperature, humidity, stress, bending, twisting, etc.), and thus, also have a great competitive advantage in sensing measurements. [0003] The filteri...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing long-period fiber gratings such as complex fabrication and high manufacturing costs, the present invention provides a method for manufacturing a mechanical long-period fiber grating with the advantages of tunable resonance wavelength, controllable mode coupling strength, and erasable grating.

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