Femtosecond laser programmed type pixel-level long-period fiber grating manufacturing device

Abstract

The invention relates to a femtosecond laser programmed type pixel-level long-period fiber grating manufacturing device. A designed programmed type control system realizes the writing of femtosecond laser to long-period fiber grating fixed on optical fiber of a high-precision three-dimensional displacement platform, and the manufactured long-period fiber grating has uniform modulated refractive index, the writing of the long-period fiber grating with tunable resonant wavelength and resonant peak can be realized by controlling the mobile distance and reciprocating times of the three-dimensional displacement platform, and the femtosecond laser programmed type pixel-level long-period fiber grating manufacturing device has the characteristics of small writing loss and high femtosecond laser utilization rate. Through the design of the programmed type system, the writing of the long-period fiber grating with tunable resonant wavelength and resonant peak can be realized by utilizing femtosecond. The manufactured femtosecond laser programmed type pixel-level long-period fiber grating manufacturing device has the advantages of low noise, no backward reflection, long resonant wavelength, easiness in tuning, controllability on the depth of resonant peak, and the like, thus providing an efficient preparation method with tunable parameters for applications in the fields of scientific research, fiber-optical communication and optical fiber sensing technology.

Description

technical field [0001] The invention relates to a long-period preparation system in the technical field of optical fiber sensing and fiber grating preparation, in particular to a femtosecond laser program-controlled point-by-point long-period fiber grating preparation device. Background technique [0002] Long-period fiber grating is a new type of optical device made on optical fiber. It refers to the transmission optical device formed by the periodic refractive index modulation of tens to hundreds of microns on the optical fiber. Optical fiber sensing has important uses. Long-period fiber gratings have the characteristics of easy fabrication, large stop band width, no back reflection, low dispersion, and sensitivity to external changes, especially good compatibility with optical fiber systems, making them superior performance in the field of optical fiber communication and sensing. One of the passive photonic devices. In optical fiber communication, it is mainly used as g...

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Problems solved by technology

However, due to the existence of thermal diffusion, the coupling from the fundamental mode of the core to the cladding mode is not complete, and there is a large write loss

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