Multimode optical fiber

Abstract

It is proposed a multimode optical fiber including a central core, an inner depressed cladding, a depressed trench, an outer depressed cladding, and an outer cladding. The central core has an alpha-index profile. The depressed claddings limit the impact of leaky modes on optical-fiber performance characteristics (e.g., bandwidth, core size, and / or numerical aperture).

Description

technical field [0001] The present invention relates to the field of optical fiber transmission, and more particularly, to a groove-assisted concave graded-index multimode optical fiber. Background technique [0002] Traditionally, an optical fiber (ie, a glass fiber typically surrounded by one or more cladding layers) includes an optical fiber core that transmits and / or amplifies optical signals and an optical cladding that confines the optical signals within the core. Therefore, the refractive index n of the core c Usually greater than the refractive index n of the optical cladding g (ie, n c >n g ). [0003] For optical fibers, the refractive index profile is usually classified according to the graphical appearance of the function relating the refractive index to the fiber radius. Traditionally, the distance r from the center of the fiber is shown on the x-axis, and the relationship between the refractive index (at radius r) and the refractive index of the fiber's...

AI Technical Summary

Problems solved by technology

Constraints imposed by determining the location of the substrate tube typically result in a small diameter core rod, thereby increasing manufacturing costs

[0026] Thus, there is a need for a multimode fiber that includes a depressed cladding that limits the impact of leaky modes on other fiber properties (e.g., bandwidth, core size, and / or numerical aperture), but Possibly deposited into silica-based tubes at reduced width

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