Multi-core optical fiber

Abstract

The invention relates to a multi-core optical fiber, which comprises a plurality of core layers and a common outer cladding layer, and is characterized in that the number of the core layers is eight,and the core layers are uniformly distributed along the circumferential direction at equal intervals; the distance between every two adjacent core layers is 28-33 mum; each core layer is sequentiallycoated with an inner cladding layer and a sunken cladding layer from inside to outside; the eight-core homogeneous single-mode optical fiber is formed; the radius R1 of the core layer is 3.8 to 4.2 mum; the relative refractive index difference delta1 of the core layer relative to the common outer cladding is 0.36%-0.40%; the radius R2 of the inner cladding is 5-8 mum; the relative refractive indexdifference delta2 of the inner cladding layer relative to the common outer cladding layer is -0.05% to 0.05%; the radius R3 of the sunken cladding is 8-12 mum, the relative refractive index difference delta3 of the sunken cladding relative to the common outer cladding is -0.7%-0.9%, and the relative refractive index difference delta4 of the common outer cladding relative to pure silicon dioxide is -0.4%-0%. The optical fiber can be transmitted in an O waveband and a C waveband, space division multiplexing dimension density is kept, the optical fiber can be compatible with an existing device,and the comprehensive performance such as crosstalk of the optical fiber and macrobend and microbend losses of all channels is made to be in 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 optical fiber used in O-band and C-band. Background technique [0002] In recent years, with the rise of cloud computing, big data, and mobile Internet, data centers with efficient inter-server collaboration and data processing capabilities have become an obvious hotspot for the growth of information volume and information density, which puts forward urgent requirements for the improvement of data center interconnection communication speed. Due to the large number of devices, complex wiring, and high interface density in data center interconnection communication, only relying on increasing device modulation bandwidth, increasing the number of optical fiber links or output light sources with different stable wavelengths will inevitably increase the cost, power consumption, and complexity of system operation or ...

AI Technical Summary

Problems solved by technology

In order to solve this problem, Chinese patent CN106575013A proposes a multi-core optical fiber with a diameter of 125 microns, but its application range is limited to the O-band near 1310nm, and the optical fiber parameters of the C-band are very bad, and its bending loss has not been fully obtained. the solution

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