Multiband bow-tie type polarization maintaining optical fiber

Abstract

The invention discloses a multiband bow-tie type polarization maintaining optical fiber, and relates to the field of polarization maintaining optical fibers. The optical fiber comprises a quartz area, wherein a circular core area and two stress areas are arranged in the quartz area; the two stress regions are symmetrically distributed along the center of the core region; the core area sequentially comprises a first core layer, a second core layer and a quartz transition layer from inside to outside, wherein the center of the core area is taken as a circle center; the relative refractive index difference delta 11 of the first core layer relative to the quartz region is 0.5-1.1%; the relative refractive index difference delta 12 of the second core layer relative to the quartz region is -0.5% to -0.05%; the refractive index n 14 of the quartz transition layer is equal to the refractive index n 16 of the quartz region; and the refractive index n 2 of the stress regions decreases in a logarithmic curve from the near core region to the far core region. The optical fiber cutoff wavelength provided by the invention is less than 850 nm, the research and development requirements of users on the optical fiber gyroscope with the wave band of 850 nm can be met, and meanwhile, the optical fiber has good attenuation and crosstalk stability.

Description

technical field [0001] The invention belongs to the field of polarization-maintaining optical fibers, and in particular relates to a multi-band bow-tie type polarization-maintaining optical fiber. Background technique [0002] Fiber optic gyro is one of the most important achievements in the field of fiber optic sensing. It has many advantages such as small size, light weight, anti-electromagnetic interference, large dynamic range, no moving parts, no wearing parts, flexible structural design and wide application range. Military fields such as aerospace, navigation and weapons and civil fields such as geology and oil exploration have broad development prospects. [0003] The technical basis of the fiber optic gyroscope is high-precision coherent detection and fiber optic sensing technology, and the stability of its output signal depends on the stability of the polarization state of the two beams of coherent light in the fiber. In the 1980s, Shupe D M proposed that when ther...

AI Technical Summary

Problems solved by technology

However, the existing polarization-maintaining fiber does not have the support of this type of thin-diameter polarization-maintaining fiber product. Therefore, the current problem is that there is an urgent need to research and develop a multi-band bow-tie type polarization-maintaining fiber that can meet the user's research and development requirements for the 850nm band fiber optic gyroscope.

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