Ultra-Wide-Bandwidth Tunable Magnetic Fluid-Filled Hybrid Connected Dual-Core Photonic Crystal Fiber Mode Converter

Abstract

Abstract:We propose a tunable magnetic fluid-filled hybrid photonic crystal fiber mode converter. Innovative design principles based on the hybrid connected dual-core photonic crystal fiber and magnetically modulated optical properties of magnetic fluid are developed and numerically verified. The mode converter was designed to convert LP 11 in the index-guiding core to the LP 01 mode in the photonic bandgap-guiding core. By introducing the magnetic fluid into the air-hole located at the center of the photonic bandgap-guiding core, the mode converter can realize a high coupling efficiency and an ultra-wide bandwidth. The coupling efficiency can reach up to 99.9%. At a fixed fiber length, by adjusting the strength of the magnetic field, the coupling efficiency can reach up to 90% and 95% at wavelengths in the ranges of 1.33 µm-1.85 µm and 1.38 µm-1.75 µm, with bandwidth values reaching 0.52 µm and 0.37 µm, respectively. Moreover, it has a good manufacturing flexibility. The mode converter can be used to implement wideband mode-division multiplexing of few-mode optical fiber for high-capacity telecommunications.

Asymmetric dual-core liquid crystal channel-based tunable mode converter

“…The characteristics of the studied modes are obtained using the full vectorial finite difference method (FVFDM) via the Lumerical software package 32 . In terms of the device length (L D ), thermal tunability, and crosstalk, the operation of the reported mode converter outperforms that of similar devices 27 – 30 , recently presented in the literature.…”

“…Intermodal coupling in asymmetric dual-core photonic crystal fibers (ADC-PCF) has recently been reported and studied in the context of mode conversion 27 – 30 . Lin et al 27 have introduced an LP 01 to LP 02 mode converter based on a unique DC-PCF for dispersion adjustment.…”

“…In this study 29 , the bandwidth, phase-matching wavelength, and coupling efficiency can be controlled by adjusting the refractive index of the hole between the dual cores. Additionally, Yu et al 30 have shown that a tunable magnetic fluid-filled hybrid PCF mode converter can convert the LP 11 mode in the index-guiding core to the LP 01 mode in the photonic bandgap-guiding core. The coupling efficiency can approach 95% using a 835 μm long fiber 30 in the wavelength range from 1380 to 1750 nm, with a phase-matching bandwidth of 370 nm.…”

“…Additionally, Yu et al 30 have shown that a tunable magnetic fluid-filled hybrid PCF mode converter can convert the LP 11 mode in the index-guiding core to the LP 01 mode in the photonic bandgap-guiding core. The coupling efficiency can approach 95% using a 835 μm long fiber 30 in the wavelength range from 1380 to 1750 nm, with a phase-matching bandwidth of 370 nm. In addition, a tunable mode converter based on dual core PCF where one core is infiltrated with NLC has been proposed in 31 .…”

Tunable Mode Converter Device Based on Photonic Crystal Fiber with a Thermo-Responsive Liquid Crystal Core

“…More recently, Yu et al proposed a tunable magnetic fluid-filled hybrid PCF mode converter designed to convert the LP 11 mode in the index-guiding core to the LP 01 mode in the photonic bandgap-guiding core. They found that the coupling efficiency can reach 90% and 95% in the wavelength ranges 1.33-1.85 µm and 1.38-1.75 µm, respectively, with bandwidth values of 520 nm and 370 nm, in a 835 µm long fiber [23].…”