{"title":"In-Band Sensing and Communication for Optical Access Networks Using Δϕ-OTDR With Simplified Transceivers","authors":"Pallab K. Choudhury;Élie Awwad","doi":"10.1109/LSENS.2024.3447091","DOIUrl":null,"url":null,"abstract":"An in-band integration strategy is proposed by inserting a sensing probe signal over communication data by modulating the same wavelength channel for next-generation optical access network targeting wavelength-division multiplexing (WDM) point-to-point links. The integration is done by exploring the dc-balanced property of a Manchester-coded signal allowing an effective reduction of low-frequency components to accommodate an in-band Golay-coded lower frequency signal that acts as a sensing probe. The system is demonstrated for 10-Gb/s downstream data over a 20-km fiber with a simple direct-detection receiver in a mobile- or enterprise-fronthaul-based WDM link. Differential-phase-sensitive optical time-domain reflectometry is used to locate external perturbations by using the Golay-coded signal for channel estimation and a coherent receiver at the central office. The presented results show that the downstream data can be successfully retrieved from the integrated signal within a pre-forward error correction bit error rate limit of 10\n<sup>−3</sup>\n maintaining enough input optical power budget at the receiver side. Moreover, the backscattered signal is analyzed for accurate detection of two simultaneous events applied over the fiber maintaining a sensing spatial resolution of 2.1 m and a maximum acoustic bandwidth of 381 Hz with a strain sensitivity down to 15 nϵ\n<sub>pp</sub>\n (peak to peak).","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Sensors Letters","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10643270/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
An in-band integration strategy is proposed by inserting a sensing probe signal over communication data by modulating the same wavelength channel for next-generation optical access network targeting wavelength-division multiplexing (WDM) point-to-point links. The integration is done by exploring the dc-balanced property of a Manchester-coded signal allowing an effective reduction of low-frequency components to accommodate an in-band Golay-coded lower frequency signal that acts as a sensing probe. The system is demonstrated for 10-Gb/s downstream data over a 20-km fiber with a simple direct-detection receiver in a mobile- or enterprise-fronthaul-based WDM link. Differential-phase-sensitive optical time-domain reflectometry is used to locate external perturbations by using the Golay-coded signal for channel estimation and a coherent receiver at the central office. The presented results show that the downstream data can be successfully retrieved from the integrated signal within a pre-forward error correction bit error rate limit of 10
−3
maintaining enough input optical power budget at the receiver side. Moreover, the backscattered signal is analyzed for accurate detection of two simultaneous events applied over the fiber maintaining a sensing spatial resolution of 2.1 m and a maximum acoustic bandwidth of 381 Hz with a strain sensitivity down to 15 nϵ
pp
(peak to peak).