Ultra-Narrow Bandwidth Microwave Photonic Filter Implemented by Single Longitudinal Mode Parity Time Symmetry Brillouin Fiber Laser
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Published:2023-06-27
Issue:7
Volume:14
Page:1322
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ISSN:2072-666X
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Container-title:Micromachines
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language:en
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Short-container-title:Micromachines
Author:
Hou Jiaxin1,
You Yajun2ORCID,
Liu Yuan1,
Jiang Kai1,
Han Xuefeng1,
He Wenjun1,
Geng Wenping3ORCID,
Liu Yi1,
Chou Xiujian1
Affiliation:
1. Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, China
2. School of Aerospace Engineering, North University of China, Taiyuan 030051, China
3. School of Semiconductor and Physics, North University of China, Taiyuan 030051, China
Abstract
In this paper, a novel microwave photonic filter (MPF) based on a single longitudinal mode Brillouin laser achieved by parity time (PT) symmetry mode selection is proposed, and its unparalleled ultra-narrow bandwidth as low as to sub-kHz together with simple and agile tuning performance is experimentally verified. The Brillouin fiber laser ring resonator is cascaded with a PT symmetric system to achieve this MPF. Wherein, the Brillouin laser resonator is excited by a 5 km single mode fiber to generate Brillouin gain, and the PT symmetric system is configured with Polarization Beam Splitter (PBS) and polarization controller (PC) to achieve PT symmetry. Thanks to the significant enhancement of the gain difference between the main mode and the edge mode when the polarization state PT symmetry system breaks, a single mode oscillating Brillouin laser is generated. Through the selective amplification of sideband modulated signals by ultra-narrow linewidth Brillouin single mode laser gain, the MPF with ultra-narrow single passband performance is obtained. By simply tuning the central wavelength of the stimulated Brillouin scattering (SBS) pumped laser to adjust the Brillouin oscillation frequency, the gain position of the Brillouin laser can be shifted, thereby achieving flexible tunability. The experimental results indicate that the MPF proposed in this paper achieves a single pass band narrow to 72 Hz and the side mode rejection ratio of more than 18 dB, with a center frequency tuning range of 0–20 GHz in the testing range of vector network analysis, which means that the MPF possesses ultra high spectral resolution and enormous potential application value in the domain of ultra fine microwave spectrum filtering such as radar imaging and electronic countermeasures.
Funder
the Central Guidance on Local Science and Technology Development Fund of Shanxi Province
Fundamental Research Program of Shanxi Province, China
Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China
the Graduate Innovation Project of Shanxi Province
the Graduate Science and Technology Project of the North University of China
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering
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