Polarization-maintaining optical fiber for multi-band application

Abstract

The invention discloses a polarization-maintaining optical fiber for multi-band application. The polarization-maintaining optical fiber comprises an elliptical germanium-doped core layer, a circular germanium-doped core layer, a circular fluorine-doped cladding layer and a quartz cladding layer that are arranged successively from inside to outside. The circle centers of the circular germanium-doped core layer and the circular fluorine-doped cladding layer are overlapped with the center of the elliptical germanium-doped core layer; and the refractive index of the elliptical germanium-doped corelayer is larger than that of the circular germanium-doped core layer. The shape of the refractive index profile of the circular germanium-doped core layer includes a parabolic shape and a horizontalstraight line shape that are connected and are arranged from inside to outside in a short axis direction of the elliptical germanium-doped core layer; and the refractive index profile of the circulargermanium-doped core layer are in a horizontally linear shape along the long axis direction of the elliptical germanium-doped core layer. The cut-off wavelength of the polarization-maintaining opticalfiber is less than 830nm. The polarization-maintaining optical fiber is suitable for wavelengths of 850 nm, 1310 nm and 1550 nm; and various fiber optic gyroscope winding is realized. The fiber has advantages of good bending resistance performance, good welding performance, and high attenuation and crosstalk stability.

Description

technical field [0001] The invention relates to the technical field of polarization-maintaining optical fibers, in particular to a polarization-maintaining optical fiber used in multiple bands. Background technique [0002] Inertial technology is the key technology of directional navigation and an indispensable key technology in the field of aerospace and national defense. Compared with other types of gyroscopes, fiber optic gyroscopes have the advantages of short start-up time, no active components, and strong environmental adaptability. In recent years, fiber optic gyroscopes have developed very rapidly and have become one of the main directions in the inertial field. [0003] In recent years, many fields such as aerospace, aviation, shipbuilding, national defense, high-speed rail, and oil wells have put forward urgent demands for technological progress in high-precision and miniaturization of fiber optic gyroscopes. Fiber optic gyroscopes based on the Sagnac effect use p...

AI Technical Summary

Problems solved by technology

However, the existing polarization-maintaining fiber does not have this type of thin-diameter polarization-maintaining fiber product support, and related technology development is needed

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