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...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/141454 |
| _version_ | 1811694101669609472 |
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| author | Li, Kaiwei Zhang, Nancy Meng Ying Zhang, Nan Zhang, Ting Liu, Guigen Wei, Lei |
| 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 |
| author_sort | Li, Kaiwei |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T07:02:13Z |
| format | Journal Article |
| id | ntu-10356/141454 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:02:13Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-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. |
| 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 |
| title | 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_short | 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 |
| topic | Engineering::Electrical and electronic engineering Dispersion Turning Point Optical Fiber Sensors |
| url | https://hdl.handle.net/10356/141454 |
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