Ring-shaped microstructure fiber

Abstract

The invention discloses a ring-shaped microstructure fiber which is formed by host material (1), first medium columns (2) and second refractive index medium columns (3). A fiber core (4) is located at the center of the fiber and is formed by host material. The centers of the first medium columns (2) are distributed on a circumference at equal intervals, wherein the circumference uses the center of the fiber as the circle center. The centers of the second medium columns (3) are distributed on another circumference at equal intervals, wherein the circumference uses the center of the fiber as the circle center. The distance between the centers of the first medium columns (2) and the center of the fiber is L1, the distance between the centers of the second medium columns (3) and the center of the fiber is L2, L1 is larger than 15 mu m, and L2 is larger than L1. The fiber uses the first medium columns (2) with small diameters to bind a fiber fundamental mode, uses the second medium columns (3) with large diameters to reduce bending loss of the fiber fundamental mode, and achieves the goals of a single mode, a large mode field and low bending loss transmission.

Description

technical field [0001] The invention relates to a symmetrical optical fiber structure, in particular to a microstructured optical fiber with large mode field, low bending loss characteristics and effective single-mode operation. Background technique [0002] Photonic crystal fiber and silica micro-air were first proposed in 1995. Due to the special application of this fiber in ultra-broadband transmission, supercontinuum generation, high-power optical transmission, optical amplification and other functional devices, Therefore, it has aroused the interest of many researchers. Bending loss is generally considered to be a disadvantage in light transmission. [0003] Since the photonic crystal fiber was proposed and successfully manufactured, people began to try to use the photonic crystal fiber structure to make large mode field fiber. Since the photonic crystal fiber can realize endless single-mode transmission in theory, the single-mode transmission with super large mode f...

AI Technical Summary

Problems solved by technology

but its bending performance is poor

Although single-mode transmission can be realized in theory, in fact, most of the high-order modes are removed through the loss attenuation difference, that is, the loss of the high-order mode is relatively large (generally above 1 dB/m), while the loss of the fundamental mode is relatively low (generally below 0.1 dB/m)

An effective way to achieve single-mode transmission of LMA is to use channel leaky fiber, such as LCF with a layer of air holes surrounding the fiber core proposed by Dong, but the manufacturing process of the air holes is d

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