Search

A kind of bending-insensitive multicore fiber (MCF) is proposed. The core adopts a low-mode gradient index structure to form a seven-core few-mode fiber. The finite element method is used to simulate and analyze the bending loss of the central core and the outer core, the crosstalk between the core modes, and the influence of core parameters on the crosstalk performance. Data simulation results show that even for a small bending radius of 5 mm, the bending loss of this MCF is much lower than the attenuation loss of the fiber, and the crosstalk between the adjacent cores is less than −20 dB. Therefore, independent information transmission between cores can still be realized under a small bending radius.

Selective filtering of guided modes in an all-solid bandgap cladding optical fiber based on the coupling between the cladding modes and surface plasmon polariton (SPP) modes of gold wires are investigated. The SPP mode was found to have a strong effect on the mode transmission loss of the guided modes, even when the index difference between the SPP mode and the guided mode is large. The results show that the introduction of metal wires in the fiber leads to ultra-high confinement loss for a specific guided mode, and low confinement loss for the other guided modes operating at the wavelength covering the entire C band.