Large-mode-area single-mode multi-core segmented cladding fiber

Abstract

A large-mode-area single-mode multi-core segmented cladding fiber belongs to high-power fiber optic amplifiers, laser devices and special optical fibers. The large-mode-area single-mode multi-core segmented cladding fiber overcomes the defect that existing large-mode-area single-mode fibers are low in production yield and limited in segmented mode area. According to the large-mode-area single-mode multi-core segmented cladding fiber, a rare earth doped ion core area (1) is formed in the center; from the inside to the outside, a first silicon ring core (2, 1), a first rare earth doped ion ring core (3, 1)... an Nth silicon ring core (2, N) and an Nth rare earth doped ion ring core (3, N), M segmented cores (4, 1)... (4, M) uniformly distributed around the Nth ion ring core and provided with the same radius and the same radian, an internal cladding layer (5) and an external cladding layer (6) are distributed. The ion core area, the ion ring cores and the segmented cores are identical in refractive index and are n1; the silicon ring cores are identical in refractive index and are n2, and n2<n1. A segmented fiber core is processed into the M segmented fiber cores with the same radius and the same radian through an optical fiber preform, so that the large-mode-area single-mode multi-core segmented cladding fiber save materials and is easy to manufacture, simple and effective in manufacturing method and applicable to large-scale production.

Description

technical field [0001] The invention relates to a petal-shaped optical fiber with a large-mode-field single-mode multi-layer core and belongs to the fields of high-power optical fiber amplifiers, lasers and special optical fibers. Background technique [0002] Rare earth-doped fiber amplifiers or lasers use ion fibers doped with rare earth elements (Nd, Sm, Ho, Er, Pr, Tm, Yb, etc.), and use the stimulated emission mechanism to achieve direct amplification of light. [0003] With its excellent performance and low price, fiber lasers have been widely used in optical fiber communication, industrial processing, medical treatment, military and other fields. In 2010, a continuous laser with 10kW power has been reported. With the development of laser technology applications, material processing, space communication, laser radar, photoelectric countermeasures, laser weapons, etc., high-power, high-quality lasers are required, and the single-mode output power is required to reach MW...

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the limitation of the numerical aperture of the existing traditional optical fiber, the limited optical power of the single-core multi-doped rare earth ion region double-clad optical fiber, the difficulty of making the air hole of the photonic crystal fiber, and the low mass production yield of the single-mode multi-core optical fiber with large mode field, Due to the limited diameter of the core layer of the petal-shaped fiber and the bending sensitivity of the multi-groove fiber, a petal-shaped fiber with a large mode field single-mode multi-layer core is proposed.

Images