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Open AccessArticle

Magneto-Optical Isolator Based on Ultra-Wideband Photonic Crystals Waveguide for 5G Communication System

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Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Physics and Optoelectronic Engineering, Shenzhen 518060, Guangdong, China
2
College of Electronics and Information Technology, Shenzhen University, Shenzhen 518060, Guangdong, China
*
Authors to whom correspondence should be addressed.
These authors contribute equally to this work.
Crystals 2019, 9(11), 570; https://doi.org/10.3390/cryst9110570
Received: 25 September 2019 / Revised: 27 October 2019 / Accepted: 28 October 2019 / Published: 30 October 2019
(This article belongs to the Special Issue Photonic Crystals)
This paper presents a novel magneto-optical isolator based on an ultra-wideband and high efficiency photonic crystals (PCs) waveguide and gyromagnetic ferrites. The three-dimensional numerical simulation finds that the photonic crystals waveguide’s (PCW) transmission efficiency rises with its height and width. The corresponding experiments are performed by using a triangular lattice Al2O3 dielectric posts array in 5G millimeter wave band. The measured transmission efficiency is up to 90.78% for the optimal PCs waveguide structure, which has ultra-wide operating bandwidth from 23.45 to 31.25 GHz. The magneto-optical isolator is designed by inserting two rectangular gyromagnetic ferrites into the PCs waveguide. Due to the contrast between the effective permeability of the left and right circular polarization waves passing through the magnetized ferrite sheets, the ferromagnetic resonance absorption of the forward and reverse waves is different. By using finite element method, the isolation is optimized to be 49.49 dB for the isolator and its relative bandwidth reaches 8.85%. The high isolation, broadband, and easy integration indicate that our designed magneto-optical isolator has significant advantage in 5G communication systems. View Full-Text
Keywords: 5G communication; wideband; magneto-photonic isolator; photonic band gap; photonic crystals waveguides 5G communication; wideband; magneto-photonic isolator; photonic band gap; photonic crystals waveguides
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MDPI and ACS Style

Wang, Y.; Xu, B.; Zhang, D.; Xu, S.; Dong, Z.; Zeng, X.; Lu, X.; Pei, J. Magneto-Optical Isolator Based on Ultra-Wideband Photonic Crystals Waveguide for 5G Communication System. Crystals 2019, 9, 570.

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