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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Main Authors: Liao, Ruolin, Tang, Ming, Zhao, Can, Wu, Hao, Fu, Songnian, Liu, Deming, Shum, Perry Ping
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/102697
http://hdl.handle.net/10220/47784
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Institution: Nanyang Technological University
Language: English
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spelling 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
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Brillouin
OTDR
DRNTU::Engineering::Electrical and electronic engineering
spellingShingle 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
description 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.
author2 School of Electrical and Electronic Engineering
author_facet 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
_version_ 1681035944008876032