Cargando…
Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry
A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled micror...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8780302/ https://www.ncbi.nlm.nih.gov/pubmed/35056254 http://dx.doi.org/10.3390/mi13010089 |
_version_ | 1784637804839436288 |
---|---|
author | Zhang, Bowen Chen, Nuo Lu, Xinda Hu, Yuhang Yang, Zihao Zhang, Xinliang Xu, Jing |
author_facet | Zhang, Bowen Chen, Nuo Lu, Xinda Hu, Yuhang Yang, Zihao Zhang, Xinliang Xu, Jing |
author_sort | Zhang, Bowen |
collection | PubMed |
description | A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices. |
format | Online Article Text |
id | pubmed-8780302 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-87803022022-01-22 Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry Zhang, Bowen Chen, Nuo Lu, Xinda Hu, Yuhang Yang, Zihao Zhang, Xinliang Xu, Jing Micromachines (Basel) Article A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices. MDPI 2022-01-07 /pmc/articles/PMC8780302/ /pubmed/35056254 http://dx.doi.org/10.3390/mi13010089 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Zhang, Bowen Chen, Nuo Lu, Xinda Hu, Yuhang Yang, Zihao Zhang, Xinliang Xu, Jing Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry |
title | Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry |
title_full | Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry |
title_fullStr | Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry |
title_full_unstemmed | Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry |
title_short | Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry |
title_sort | bandwidth tunable optical bandpass filter based on parity-time symmetry |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8780302/ https://www.ncbi.nlm.nih.gov/pubmed/35056254 http://dx.doi.org/10.3390/mi13010089 |
work_keys_str_mv | AT zhangbowen bandwidthtunableopticalbandpassfilterbasedonparitytimesymmetry AT chennuo bandwidthtunableopticalbandpassfilterbasedonparitytimesymmetry AT luxinda bandwidthtunableopticalbandpassfilterbasedonparitytimesymmetry AT huyuhang bandwidthtunableopticalbandpassfilterbasedonparitytimesymmetry AT yangzihao bandwidthtunableopticalbandpassfilterbasedonparitytimesymmetry AT zhangxinliang bandwidthtunableopticalbandpassfilterbasedonparitytimesymmetry AT xujing bandwidthtunableopticalbandpassfilterbasedonparitytimesymmetry |