Harnessing oversampling in correlation-coded OTDR
Coding technique has long been investigated as a solution to improve the signal-to-noise ratio (SNR) without sacrificing spatial resolution in optical time domain reflectometry (OTDR) systems. The past researches have been focusing at the construction of new codes, the combination of coding and othe...
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sg-ntu-dr.10356-1026972020-03-07T14:00:34Z Harnessing oversampling in correlation-coded OTDR Liao, Ruolin Tang, Ming Zhao, Can Wu, Hao Fu, Songnian Liu, Deming Shum, Perry Ping School of Electrical and Electronic Engineering Brillouin OTDR DRNTU::Engineering::Electrical and electronic engineering Coding technique has long been investigated as a solution to improve the signal-to-noise ratio (SNR) without sacrificing spatial resolution in optical time domain reflectometry (OTDR) systems. The past researches have been focusing at the construction of new codes, the combination of coding and other techniques, and the application of coding technique to versatile distributed optical fiber sensing systems such as Raman OTDR and Brillouin optical time domain analyzer, where the results are fruitful. Here, we reveal that oversampling after photodetection opens up a new dimension for coded OTDR other than code length and code type. We demonstrate that the coding gain can be further improved by harnessing the oversampling. Furthermore, the photodetector’s bandwidth-limited feature can also be used to select the optimal sampling rate in order to obtain additional SNR enhancement. We believe this principle could be applied to any practical correlation-coded OTDR-based distributed fiber sensing systems with sufficient SNR enhancement. Our findings can serve to update existing instruments based on correlation-coded OTDR in a straightforward manner and at a relatively low cost. Published version 2019-03-06T07:31:41Z 2019-12-06T20:59:20Z 2019-03-06T07:31:41Z 2019-12-06T20:59:20Z 2019 Journal Article Liao, R., Tang, M., Zhao, C., Wu, H., Fu, S., Liu, D., & Shum, P. P. (2019). Harnessing oversampling in correlation-coded OTDR. Optics Express, 27(2), 1693-. doi:10.1364/OE.27.001693 https://hdl.handle.net/10356/102697 http://hdl.handle.net/10220/47784 10.1364/OE.27.001693 en Optics Express © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. 13 p. application/pdf |
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Brillouin OTDR DRNTU::Engineering::Electrical and electronic engineering Liao, Ruolin Tang, Ming Zhao, Can Wu, Hao Fu, Songnian Liu, Deming Shum, Perry Ping Harnessing oversampling in correlation-coded OTDR |
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Coding technique has long been investigated as a solution to improve the signal-to-noise ratio (SNR) without sacrificing spatial resolution in optical time domain reflectometry (OTDR) systems. The past researches have been focusing at the construction of new codes, the combination of coding and other techniques, and the application of coding technique to versatile distributed optical fiber sensing systems such as Raman OTDR and Brillouin optical time domain analyzer, where the results are fruitful. Here, we reveal that oversampling after photodetection opens up a new dimension for coded OTDR other than code length and code type. We demonstrate that the coding gain can be further improved by harnessing the oversampling. Furthermore, the photodetector’s bandwidth-limited feature can also be used to select the optimal sampling rate in order to obtain additional SNR enhancement. We believe this principle could be applied to any practical correlation-coded OTDR-based distributed fiber sensing systems with sufficient SNR enhancement. Our findings can serve to update existing instruments based on correlation-coded OTDR in a straightforward manner and at a relatively low cost. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Liao, Ruolin Tang, Ming Zhao, Can Wu, Hao Fu, Songnian Liu, Deming Shum, Perry Ping |
format |
Article |
author |
Liao, Ruolin Tang, Ming Zhao, Can Wu, Hao Fu, Songnian Liu, Deming Shum, Perry Ping |
author_sort |
Liao, Ruolin |
title |
Harnessing oversampling in correlation-coded OTDR |
title_short |
Harnessing oversampling in correlation-coded OTDR |
title_full |
Harnessing oversampling in correlation-coded OTDR |
title_fullStr |
Harnessing oversampling in correlation-coded OTDR |
title_full_unstemmed |
Harnessing oversampling in correlation-coded OTDR |
title_sort |
harnessing oversampling in correlation-coded otdr |
publishDate |
2019 |
url |
https://hdl.handle.net/10356/102697 http://hdl.handle.net/10220/47784 |
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1681035944008876032 |