Weak-guide annular-structure optical fiber

Abstract

The invention discloses a weak-guide annular-structure optical fiber. The weak-guide annular-structure optical fiber comprises an annular fiber core, a central zone and a cladding. The annular fiber core has step or gradient type refractive index distribution, and an auxiliary low-refractive-index annular groove can be disposed in an inner or outer side. A refractive index difference between the annular fiber core and the clapping/central zone does not exceed 1%. A refractive index difference between the annular groove and the clapping/central zone does not exceed -1%. The weak-guide annular-structure optical fiber only supports a multichannel radial first-order mode and is divided into different mode groups. The other mode groups except for the two front mode groups have large refractive index differences. The front two mode groups can be combined and then be multiplexed through a 6*6 Multiple Input Multiple Output (MIMO) digital signal processing assist, the other mode groups are multiplexed through a 4*4 MIMO-DSP assist in each mode group, i.e., inter-mode-group low-crosstalk multiplexing and small-scale MIMO-DSP assist multiplexing in mode groups are combined. Expandability is possessed. A mode base can be a linear polarization/optical vortex/intrinsic mode. And, the weak-guide annular-structure optical fiber has a C+L waveband broadband characteristic and is compatible with existing mature optical fiber technology, the communication capacity can be effectively improved through a combination with wavelength division multiplexing, and loss can be reduced.

Description

technical field [0001] The invention belongs to the field of optical communication, and more specifically relates to a weakly guided ring-shaped optical fiber. Background technique [0002] Due to the exhaustion of well-known optical wave dimension resources (amplitude, phase, frequency / wavelength, time, polarization) in current optical communication, a "new capacity crisis" appears. In order to further increase the capacity of optical communication systems, the potential of space division multiplexing technology to solve the new capacity crisis of optical communication in the future has attracted more and more attention. Space-division multiplexing technology utilizes the spatial dimension of photons, including mode-division multiplexing (ie, mode multiplexing) technology based on few-mode fibers, multi-mode fibers, and ring fibers, and core-division multiplexing technology based on multi-core fibers. In addition, the two technologies can be combined to further improve spa...

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Problems solved by technology

[0003] Aiming at the defects of the prior art, the object of the present invention is to provide a weakly guided ring structure optical fiber, which aims to solve the

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