Multi-core optical fiber for energy transmission and preparation method thereof

The invention provides a multi-core optical fiber for energy transmission and a preparation method of the multi-core optical fiber, and relates to the technical field of special optical fiber manufacturing and high-power optical fiber laser. The multi-core optical fiber is composed of a middle core, a bypass core, a cladding, an inner coating and an outer coating, the diameter of the fiber core is 15 micrometers or above, the cladding diameter of the optical fiber is 200 micrometers or above, and the problems that in the prior art, a fiber core and a cladding of a multi-core optical fiber applied to the communication and sensing field are small in size, and the fiber core and the cladding are prone to deformation are well solved. And the design with high numerical aperture is not suitable for laser energy transmission. 本发明提出了一种能量传输用多芯光纤及其制备方法，涉及特种光纤制造技术和高功率光纤激光技术领域。所述多芯光纤由中间芯、旁芯、包层、内涂层、外涂层组成，本发明纤芯的直径在15μm以上，光纤的包层直径在200μm以上，较好的避免了现有技术中应用于通信和传感领域的多芯光纤其纤芯和包层的尺寸小，数值孔径高的设计不适用于激光能量的传输缺陷。