Square-core optical fiber

A core fiber, core layer technology, applied in clad fiber, multi-layer core/clad fiber, optical waveguide light guide, etc., can solve the problems of poor feasibility, difficult to improve coupling efficiency, difficult to control rectangular quartz tube, etc. Achieve the effect of easy control of core aspect ratio and core-skin ratio, improving mode field matching and coupling efficiency, and improving mode division multiplexing performance
CN112684538AActive Publication Date: 2021-04-20YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YANGTZE OPTICAL FIBRE & CABLE CO LTD
Publication Date
2021-04-20

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Abstract

The invention relates to a square-core optical fiber, which comprises a core layer and a cladding, and is characterized in that the radial cross section of the core layer is rectangular, the length a of the rectangle is 9-400 mu m, the width b of the core layer is 3-400 mu m, the length-width ratio a / b of the rectangle is 1-12, and the relative refractive index difference delta 1 of the core layer is 0-2.2%. The beneficial effects of the invention are that the rectangular fiber core can improve the mode field matching and coupling efficiency between the optical fiber and the on-chip rectangular waveguide, and improves the mode division multiplexing performance of few-mode and multi-mode optical fiber transmission systems; and the square-core optical fiber can be well matched with the mode of the output end of the semiconductor laser, can improve the coupling efficiency, and can be widely applied to semiconductor laser optical fiber combiner components and the like. The length-width ratio and the cladding and core ratio of the fiber core are easy to control, the optical fiber attenuation is low, and the optical fiber has great advantages in the aspect of meeting different application requirements.
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Description

Technical field

[0001] The present invention relates to a square core fiber, which belongs to the field of fiber technology.Background technique

[0002] Optical fiber communication has the characteristics of large transmission capacity, long transmission distance, fast transmission rate, etc., is widely used in optical communication networks such as long-distance trunk networks, metro networks, and access networks. Under the promotion of high-speed development of broadband data transmission business, the number of optical communication network users and new network data will continue to increase. In order to meet the growing demand for network capacity, the optical communication system uses optical signals in various multiplexing technologies in the fiber, including wavelength division multiplexing (WDM), bias multiplexing (PDM), frequency division multiplexing ( FDM) and Time Double Reuse (TDM). However, the multiplexing technologies of these dimensions have been proximate to the limit ...

Claims

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