Package method and device for fiber bragg grating with adjustable central wavelength and adjustable temperature coefficient

Abstract

The invention discloses a package method and device for a fiber bragg grating with adjustable central wavelength and an adjustable temperature coefficient. Two ends of a sleeve pipe (the middle section of which is provided with a cavity) are respectively connected with two adapting rods with a low thermal expansion coefficient and a high thermal expansion coefficient through a thread or a slidingrod structure; each adapting rod partially protrudes into the cavity of the sleeve pipe; two tail fibers of the fiber bragg grating are respectively fixed on the adapting rods at the two ends; the two adapting rods as compensation elements change the positions of two fixed points at the tail of the fiber bragg grating along with the changes of the temperature, and further prestress applied to thefiber bragg grating is changed, and thus the temperature compensation is realized; and through regulating the adapting rods at two sides internally or externally at the same time, the central wavelength of the fiber bragg grating can be regulated, and the temperature coefficient of the fiber bragg grating is regulated through rotating or moving the sleeve pipe to regulate the lengths of the two adapting rods protruding into the cavity in the sleeve pipe.

Description

technical field [0001] The invention relates to a packaging method and device with adjustable center wavelength and temperature coefficient of an optical fiber grating, and belongs to the technical fields of optical fiber communication systems and optical fiber sensing. Background technique [0002] As an all-fiber passive device, fiber gratings are widely used in the field of optical fiber sensing and optical fiber communication systems. It exposes the optical fiber under the interference fringes of ultraviolet light, so that the fiber core produces a permanent periodic refractive index distribution along the axial direction, thereby forming a reflective passive optical device with wavelength selectivity. [0003] In practical applications, as the external temperature changes, the effective refractive index and grating period of the fiber Bragg grating will change accordingly. Since the central wavelength of the fiber Bragg grating is related to its effective refractiv...

AI Technical Summary

Problems solved by technology

This patent provides a simple and compact fiber grating packaging solution, which has the following disadvantages: after packaging, the packaging effect cannot be adjusted, and it often requires repeated packaging to achieve the required temperature coefficient requirements. At the same time, the center of the fiber grating Wavelength cannot be adjusted

Its disadvantages are: it is impossible to adjust the temperature coefficient of the packaged grating, and while adjusting the center wavelength of the fiber grating, it is not in the axial direction due to the offset of the outer bushing; therefore, when the external temperature changes, its axial direction The expansion or contraction component will change, resulting in a change in the encapsulation effect for temperature compensation

Its disadvantages are: the optical fiber is bent and wound on the floating adjustment block, which limits the floating adjustment block to have a large bending radius to prevent the optical fiber from breaking after bending, resulting in a large size of the device

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