Large-mode-field multilayer segmented cladding fiber

Abstract

A large-mode-field multilayer segmented cladding fiber belongs to the field of large-power fiber amplifiers, lasers and special fibers. On the basis of a traditional multilayer trench fiber, low-refractive-index inhibition channels are adopted to divide high-refractive-index rings into multilayer segmented cladding cores, so mode loss of the fiber can be controlled and the single-mode transmission characteristics of the fiber can be improved. A high-refractive-index fiber core (1) is arranged in the center of the fiber. Low-refractive-index trenches and high-refractive-index rings of an inner cladding (2) are arranged in order from inside to outside. The layer number of the high-refractive-index rings is N (1<=N<=6). The high-refractive-index rings are segmented by M inhibition channels into N*M segmented cladding cores (1<=M<=4), which are (11, 21, 31, 41)......(16, 26, 36, 46) in order from inside to outside. The outmost layer is an outer cladding (3). The fiber of the invention can be manufactured through combination of an MCVD method and a glass rod filling method, and the inhibition channels in the high-refractive-index rings of a fiber prefabricated rod can be realized through a glass rod filling method.

Description

technical field [0001] The invention relates to a multilayer petal-shaped optical fiber with a large mode field area, belonging to the fields of high-power optical fiber amplifiers, lasers and special optical fibers. Background technique [0002] With the wide application of laser technology in material processing, space communication, laser radar, photoelectric countermeasures, laser weapons, etc., in order to obtain high-power and high-quality lasers, the single-mode output power is required to reach the MW or even GW level. Therefore, fiber lasers with advantages such as high conversion efficiency, low laser threshold, and good beam quality have been paid more and more attention. In 1988, since Snitzer et al. proposed double clad fiber [Snitzer, E., et al. Double clad, offset core Nd fiberlaser. Optical Fiber Sensors 1988.], based on this cladding pump laser and amplifier have achieved rapid development . In recent years, with the increase in the power of semiconductor ...

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Problems solved by technology

[0004] 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 defects such as the limited diameter of the core layer of the petal-shaped optical fiber, and to improve the single-mode transmission characteristics of the multi-groove optical fiber, the present invention proposes a multi-layer petal-shaped optical fiber with a large mode field area, which can suppress the attenuation of the optical fiber and reduce the loss of the optical fiber. Effectively improve the single-mode transmission characteristics of optical fiber

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