A kind of multi-core optical fiber and its easy-branch optical cable

Abstract

The present invention relates to a multi-core optical fiber and its branchable optical cable, comprising a common outer cladding and a plurality of fiber cores arranged in the common outer cladding, characterized in that the number of said fiber cores is eight, including a central fiber core and seven outer cores, the central core is arranged in the center of the common outer cladding, and the remaining seven cores are equidistantly distributed around the central core on the periphery of the central core, and the seven outer cores and The equal spacing d1 of the central core is 35-43 μm, the core spacing of the seven outer cores is 31-37 μm, and the eight cores are homogeneous single-mode optical fibers, and each core includes a core layer, a The inner cladding and the depressed cladding, and the common outer cladding are the outer cladding of each fiber core. The invention has a reasonable structure setting, not only low attenuation, small crosstalk between cores, and comprehensive performance such as macrobend loss of each channel is at a good level, but also can meet the transmission of C-band and O-band, while maintaining a high space division multiplexing dimension density while being compatible with existing devices.

Description

technical field [0001] The invention relates to a space-division multiplexing multi-core optical fiber used in an optical fiber communication system and an easily-branched optical cable thereof, in particular to an eight-core optical fiber used in O-band and C-band and an easily-branched optical cable prepared from the optical fiber. Background technique [0002] Optical communication plays an extremely important supporting role in the information industry due to its large capacity, fast speed, and long distance. In recent years, with the continuous development of erbium-doped fiber amplifiers, wavelength division multiplexing, and high-spectrum-efficiency coding technologies, the transmission capacity of optical communication systems has continued to increase. However, as the transmission capacity of single-mode optical fibers has gradually approached the Shannon limit , the development of optical communication transmission technology tends to be slow (such as Figure 4 sho...

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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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