Crosstalk suppression type multi-core optical fiber beam splitter with low insertion loss

Abstract

The invention provides a crosstalk suppression type multi-core optical fiber beam splitter with low insertion loss. The multi-core optical fiber beam splitter is characterized by being composed of aninput standard single-mode optical fiber, a multi-clad optical fiber, a porous quartz capillary sleeve and a multi-core optical fiber. Fiber cores of the single-mode optical fiber and the multi-clad optical fiber have the same single-mode field distribution; the multi-clad optical fiber is embedded into the porous quartz capillary sleeve; the diameter of the fused and tapered multi-clad optical fiber is reduced; optical fields in the fiber cores are converted in inner claddings; fundamental mode transmission is kept; and a mode field of an output end is matched with that of the multi-core optical fiber. The specially designed multi-clad optical fiber can effectively reduce the insertion loss of a device and effectively suppress the inter-core crosstalk of the device. The multi-core opticalfiber beam splitter can be used for low-loss and low-crosstalk beam splitting connection of the multi-core optical fiber, and is particularly suitable for beam splitting connection of the multi-coreoptical fiber with the large fiber core number and the high fiber core density.

Description

[0001] (1) Technical field [0002] The invention relates to a low insertion loss crosstalk suppressing multi-core optical fiber beam splitter, which belongs to the technical field of multi-core optical fiber devices. [0003] (2) Background technology [0004] Multi-core optical fiber plays a vital role in the optical communication transmission system of space division multiplexing. In such a high-speed, high-capacity information transmission system, a multi-core optical fiber splitter is an optical fiber that separates signals from each core of the multi-core optical fiber without interfering with each other and connects it to a common single-mode optical fiber. Integrated devices. Generally speaking, multi-core fiber splitters need to have the following performance characteristics: (1) Cover the traditional optical communication band (C+L band); (2) Each signal channel needs to withstand tens to hundreds of milliwatts (3) Low insertion loss; (4) Low crosstalk between cores...

AI Technical Summary

Problems solved by technology

Although the multi-core optical fiber beam splitting connection function has been completed in this solution, since the mode field transition of the optical fiber is not easy to control during the tapering process, the signal crosstalk between the cores is serious, especially when the number of cores of the multi-core optical fiber is large ( Such as 19-core optical fiber), when the core spacing is small, the crosstalk between the cores is greater, and the output mode field of the device does not completely match the multi-core optical fiber, which also causes a large connection adaptation loss

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