Abstract
In this paper, a trench-assisted low-bending-loss large-mode-field-area multi-core fiber with air hole is proposed, which can achieve dual-mode transmission. The influence of structural parameters on fiber performance is analyzed systematically, and the structure of the trench, with a lower refractive index than the cladding, is also analyzed and optimized. By adjusting the structural parameters, the effective mode field area of the fundamental mode can reach 2003.24 um2 at 1550 nm, and when the bending radius is 1 cm, the bending loss is 2.57 × 10−3 dB/m. The practical implementation of the proposed fiber is feasible using existing fabrication technology and is applicable to the transmission of large-capacity optical communication systems and high-power lasers.
Highlights
The advent of the “Internet +” era and the 5G era have put forward higher requirements for the high speed and high bandwidth of optical communication networks
Increasing the mode field area can reduce the nonlinear effect of the fiber, but it will increase the number of transmittable modes in the fiber and bring about bending loss
= ndistance center − nclad; Δn = ncore − nclad is the refractive index difference between the core and between the core and the core, Λ = 14 um is the spacing between the air holes, air and dcenter is the diameter of the central core
Summary
The advent of the “Internet +” era and the 5G era have put forward higher requirements for the high speed and high bandwidth of optical communication networks. Low-bending loss and large-mode area few-mode fibers have important research significance in high-power optical communication devices [3]. The strong coupling multi-core fiber (MCF) increases the mode field area (MFA) of the fiber by introducing the lateral coupling of the core, thereby reducing the nonlinear effect. It is often used in fiber lasers and amplifiers [4]. Used fiber structures for achieving a large mode field and low bending loss include: photonic crystal fiber, trench-assisted fiber, and multi-core fiber. A trench-assisted low-bending-loss large-mode-field-area multi-core fiber high powerMCF). Fabrication techniques, the practical implementation of the proposed fiber is feasible
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