Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers

We present a systematic study on the spectral characteristics and ultrahigh sensitivity near the dispersion turning point (DTP) of optical microfiber couplers. Numerical simulations reveal that a DTP exists when the group effective refractive index (RI) difference between the even mode and the odd m...

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Main Authors: Li, Kaiwei, Zhang, Nancy Meng Ying, Zhang, Nan, Zhang, Ting, Liu, Guigen, Wei, Lei
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/141454
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1414542020-06-08T09:00:02Z Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers Li, Kaiwei Zhang, Nancy Meng Ying Zhang, Nan Zhang, Ting Liu, Guigen Wei, Lei School of Electrical and Electronic Engineering CNRS International NTU THALES Research Alliance Engineering::Electrical and electronic engineering Dispersion Turning Point Optical Fiber Sensors We present a systematic study on the spectral characteristics and ultrahigh sensitivity near the dispersion turning point (DTP) of optical microfiber couplers. Numerical simulations reveal that a DTP exists when the group effective refractive index (RI) difference between the even mode and the odd mode equals zero, where both ultrahigh positive RI sensitivities and negative RI sensitivities can be achieved. The position of the DTP is dependent on the coupler width, and it always exists over the surrounding RI (SRI) range of 1.333-1.41, which enables the ultrasensitive RI sensing in this wide RI range. Then, we studied the interference spectra characteristics around the DTP both theoretically and experimentally. We further experimentally demonstrate ultrahigh sensitivities of 59624 nm/refractive index unit (RIU) and -58470 nm/RIU around the SRI of 1.333 and 26999 nm/RIU and -29267 nm/RIU around the SRI of 1.35, respectively. High figure of merits of 4192 and 5280 are also achieved around the SRI of 1.333 and 1.35, respectively. Finally, utilizing the exceptional RI sensitivity, we demonstrate an ultrasensitive temperature sensor with a negative sensitivity of -15.23 nm/°C and a positive sensitivity of +16.78 nm/°C. MOE (Min. of Education, S’pore) 2020-06-08T09:00:02Z 2020-06-08T09:00:02Z 2018 Journal Article Li, K., Zhang, N. M. Y., Zhang, N., Zhang, T., Liu, G., & Wei, L. (2018). Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers. Journal of Lightwave Technology, 36(12), 2409-2415. doi:10.1109/JLT.2018.2815558 0733-8724 https://hdl.handle.net/10356/141454 10.1109/JLT.2018.2815558 2-s2.0-85043777540 12 36 2409 2415 en Journal of Lightwave Technology © 2018 IEEE. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Dispersion Turning Point
Optical Fiber Sensors
spellingShingle Engineering::Electrical and electronic engineering
Dispersion Turning Point
Optical Fiber Sensors
Li, Kaiwei
Zhang, Nancy Meng Ying
Zhang, Nan
Zhang, Ting
Liu, Guigen
Wei, Lei
Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers
description We present a systematic study on the spectral characteristics and ultrahigh sensitivity near the dispersion turning point (DTP) of optical microfiber couplers. Numerical simulations reveal that a DTP exists when the group effective refractive index (RI) difference between the even mode and the odd mode equals zero, where both ultrahigh positive RI sensitivities and negative RI sensitivities can be achieved. The position of the DTP is dependent on the coupler width, and it always exists over the surrounding RI (SRI) range of 1.333-1.41, which enables the ultrasensitive RI sensing in this wide RI range. Then, we studied the interference spectra characteristics around the DTP both theoretically and experimentally. We further experimentally demonstrate ultrahigh sensitivities of 59624 nm/refractive index unit (RIU) and -58470 nm/RIU around the SRI of 1.333 and 26999 nm/RIU and -29267 nm/RIU around the SRI of 1.35, respectively. High figure of merits of 4192 and 5280 are also achieved around the SRI of 1.333 and 1.35, respectively. Finally, utilizing the exceptional RI sensitivity, we demonstrate an ultrasensitive temperature sensor with a negative sensitivity of -15.23 nm/°C and a positive sensitivity of +16.78 nm/°C.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Li, Kaiwei
Zhang, Nancy Meng Ying
Zhang, Nan
Zhang, Ting
Liu, Guigen
Wei, Lei
format Article
author Li, Kaiwei
Zhang, Nancy Meng Ying
Zhang, Nan
Zhang, Ting
Liu, Guigen
Wei, Lei
author_sort Li, Kaiwei
title Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers
title_short Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers
title_full Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers
title_fullStr Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers
title_full_unstemmed Spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers
title_sort spectral characteristics and ultrahigh sensitivities near the dispersion turning point of optical microfiber couplers
publishDate 2020
url https://hdl.handle.net/10356/141454
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