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

A multi-core optical fiber and insertion loss technology, which is applied in light guides, optics, instruments, etc., can solve the problems that the output mode field of the device is not completely matched with the multi-core optical fiber, the transition of the optical fiber mode field is difficult to control, and the large connection adaptation loss. Achieve the effect of reducing inter-core crosstalk, reducing radiation mode loss, and reducing splicing loss

Inactive Publication Date: 2019-11-12
GUILIN UNIV OF ELECTRONIC TECH
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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

Method used

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

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[0033] The present invention will be further explained below in conjunction with the drawings and specific embodiments.

[0034] First of all, combined with figure 1 Explain the working principle of the lost core type multi-core fiber splitter.

[0035] A waveguide 1 constructed with three different refractive indices, such as figure 1 As shown, the refractive index of the core 1-1 is n 1 , The core diameter is 9μm, from the refractive index of n 1 Low n 2 The inner cladding layer 1-2 is formed with a diameter of 70 μm. The outer surface of the inner cladding is determined by the refractive index ratio n 2 Lower n 3 The composition is surrounded by outer cladding layers 1-3, with an outer diameter of 125 μm. When this fiber is drawn into a cone, the refractive index is n at the thinner end of the cone 2 When the inner cladding layer 1-2 shrinks from a diameter of 70μm to a diameter of 9μm, the original refractive index is n 1 The diameter of the core 1-1 is reduced from 9μm to 1.15...

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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...

Claims

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Application Information

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IPC IPC(8): G02B6/26G02B6/255G02B6/28
CPCG02B6/2551G02B6/26G02B6/2856
Inventor 苑立波杨世泰
Owner GUILIN UNIV OF ELECTRONIC TECH
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