Full optical fiber laser synthesizer and preparation method thereof

The invention discloses a novel all optical fiber laser synthesizer which is used for high-power optical fiber lasers and amplifiers and a preparation method thereof. The novel full optical fiber laser synthesizer is composed of an optical fiber bundle consisting of a plurality of optical fibers with a certain diameter, wherein the optical fiber bundle comprises a rare earth doped fiber 11 in the middle and a plurality of multimode optical fibres 12, the shape of the rare earth doped fiber 11 the coating of which is removed is regular polygon, and the shape of the multimode optical fibre the coating of which is removed is round; all optical fibers in a middle position 02 are tight and close, and the outer surface of the optical fiber bundle is coated with a coating with the refractive index lower than that of pure quartz; and all optical fibers on two end parts 01 and 03 of the optical fiber bundle can be separated, and each optical fiber is independently coated with a coating. The fiber bundle is formed by carrying out wiredrawing on the corresponding optical fiber preform bunch on an optical fiber wire drawer tower in the mode of designed arrangement. The full optical fiber laser synthesizer of the invention has simple preparation process, is suitable to be produced in large batch and has the characteristics of high reliability and low insertion loss.