Eigenmode completely separate type degenerated multimode fiber

Abstract

The present invention relates to an eigenmode completely separate type degenerated multimode fiber. The degenerated multimode fiber comprises a birefringence fiber core, a stress region and a cladding. The birefringence fiber core provides the shape structure birefringence, and adopts an elliptical-core/elliptical ring-shaped fiber core structure. The stress region provides a stress additional birefringence and adopts a circular (panda type) or fan ring-shaped (bow-tie/butterfly-shaped) structure. The shape structure birefringence and the stress additional birefringence are superposed, so that the multi-channel eigenmode is enabled. Meanwhile, the difference among the effective refractive indexes of all eigenmodes is larger than 1*10-4 simultaneously. As a result, all eigenmodes are completely separated and degenerated. According to the technical scheme of the invention, the number of optical fiber degenerated eigenmodes is increased, and the crosstalk among the eigenmodes is reduced. The degenerated multimode fiber can be applied to the optical fiber multi-channel eigenmode multiplexing communication, while the multiple-input and multiple-output digital signal processing technique is not required. Based on the manufacturing process of panda type/bow-tie type/butterfly type elliptic-core polarization-preserving fibers and ring-shaped optical fibers, the eigenmode completely separate type degenerated multimode fiber is convenient for actual drawing.

Description

technical field [0001] The invention belongs to the field of optical communication, and relates to a degenerated multimode optical fiber with completely separated eigenmodes. Background technique [0002] Studies have shown that with the advent of the information explosion and the era of big data, Internet data traffic has increased by about 60% per year. According to this trend, the total amount of social information is expected to increase by 2 to 4 orders of magnitude in the next 10 to 30 years. High-speed and large-capacity is the eternal development theme of optical communication. However, the existing multiplexing technologies (such as wavelength division multiplexing technology, time division multiplexing technology and polarization multiplexing technology, etc.) to improve the capacity of optical communication and advanced advanced modulation technology are close to their capacity limit, and new capacity of optical communication has emerged. crisis. In order to fur...

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Problems solved by technology

[0005] In view of the above problems, the present invention provides a degenerate multimode optical fiber with completely separated eigenmodes, which is used in the field of mode division multiplexing transmission directly based on optical fiber eigenmode multiplexing, and solves the problem of existing optical fiber mode division multiplexing transmission. The number of mode channels is small, the mode crosstalk is large, and technical problems such as MIMO-DSP assistance are required

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