Bendable all-solid-state single-polarization photonic band gap optical fiber with core diameter of more than 45 microns

Abstract

The invention discloses a bendable all-solid-state single-polarization photonic band gap optical fiber with the core diameter of more than 45 microns, and the structure of the optical fiber comprisesa fiber core region, a high-refractive-index rod region, a stress boron rod array region and an optical fiber cladding substrate region in sequence from the inside to the outside, the high-refractive-index rod region is provided with high-refractive-index rods which are distributed in the axial direction of the optical fiber and penetrate through the whole optical fiber; and boron-doped quartz rods which are distributed in the axial direction of the optical fiber and penetrate through the whole optical fiber are arranged in the stress boron rod array region, so that light emitted by the activemicrostructure optical fiber is single polarized light, the innermost layer is active doped, such as ytterbium-doped, erbium-doped, thulium-doped, neodymium-doped or passive fiber cores, and the substrate area is quartz, plastic, soft glass, such as chalcogenide glass, hoofate glass and fluoride glass. The bendable all-solid-state single-polarization photonic band gap optical fiber with the corediameter of more than 45 microns has the advantages that under the condition that the diameter of the fiber core is larger than 45 micrometers, single-mode transmission and low bending loss are achieved at the same time, the single-polarization property can be achieved, and the nonlinear effect problem of the single-polarization optical fiber under high power is solved.

Description

technical field [0001] The invention relates to a microstructure optical fiber, in particular to a bendable all-solid-state single-polarized photonic bandgap optical fiber with a core diameter of more than 45 microns. Background technique [0002] In recent years, high-power fiber lasers, especially high-power fiber lasers with single polarization performance required for coherent combination and frequency conversion, have been more and more widely used in manufacturing and processing. In order to output higher power and reduce the nonlinear effect of the fiber caused by high power, the method of expanding the core area of ​​the active fiber is generally adopted. When the core area is enlarged, according to the determination formula of the single-mode fiber, in order to maintain the The optical fiber is still a single-mode output. When manufacturing the optical fiber, it is necessary to reduce the effective refractive index difference between the core and the cladding of the...

AI Technical Summary

Problems solved by technology

However, due to the doping technology such as MCVD, the refractive index difference between the doped fiber core and the cladding silica cannot be very small, so that it cannot meet the requirements of expanding the core area while maintaining the single-mode output of the active fiber.

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