A kind of multi-core multimode optical fiber

Abstract

The invention relates to a multi-core multi-mode optical fiber, comprising a plurality of core layers and a common outer cladding, characterized in that the number of the core layers is 2, 4 or 8, and each core layer is equally spaced along the circumferential direction , the spacing between adjacent core layers is 38-60 μm for 2 core layers, 38-48 μm for 4 or 8 core layers, and the inner cladding layer and the sunken cladding layer are sequentially coated from the inside to the outside of each core layer, forming a multi-core homogeneous and more Mode fiber, the core layer refractive index profile is parabolic, α is 1.9~2.1, core layer R1 is 12~20μm, core layer Δ1max is 0.7%~1.7%, inner cladding layer width is 0.5~2.5μm, Δ2 is ‑ 0.4%~0.0%, the unilateral width of the sunken cladding layer is 3~7μm, Δ3 is ‑0.7%~‑0.9%, and the common outer cladding is a pure silicon dioxide layer. The invention can not only support multi-mode transmission in the wavelength range of 850nm to 950nm and single-mode transmission in O-band / C-band, but also can optimize the optical fiber structure and viscosity matching to reduce attenuation, so that the crosstalk of the optical fiber, the macrobend and the microbend of each channel can be reduced. The comprehensive performance such as loss is at a good level.

Description

technical field [0001] The invention relates to a space-division multiplexing optical fiber used in an optical fiber communication system, in particular to a multi-core multi-mode optical fiber. Background technique [0002] In recent years, with the rise of cloud computing, big data, and the mobile Internet, data centers with efficient inter-server collaboration and data processing capabilities have become an obvious hotspot for the growth of total information and information density, which greatly affects the communication rate of data center interconnection. urgent demand for improvement. Due to the characteristics of a large number of devices, complex wiring, and high interface density in the data center interconnection communication, only relying on increasing the modulation bandwidth of the devices, increasing the number of optical fiber links or the number of output light sources with different stable wavelengths will inevitably increase the operation or maintenance o...

AI Technical Summary

Problems solved by technology

Since the multi-core optical fiber contains multiple cores, the thickness between the core and the outer cladding is small, and the bending loss at this time is large, which affects its transmission performance

On the other hand, there is energy coupling between the cores of the multi-core optical fiber, resulting in inter-core crosstalk, which increases the transmission bit error rate

[0004] Existing multi-core optical fiber research and invention patents focus on multi-core single-mode optical fiber or multi-core few-mode optical fiber, and less research on multi-core multi-mode optical fiber

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