Phi-OTDR signal amplification

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F15%3APU114058" target="_blank" >RIV/00216305:26220/15:PU114058 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1117/12.2179026" target="_blank" >http://dx.doi.org/10.1117/12.2179026</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1117/12.2179026" target="_blank" >10.1117/12.2179026</a>

Result language
angličtina
Original language name
Phi-OTDR signal amplification
Original language description
Phase-sensitive optical time-domain reflectometry seems to be the most appropriate solution for acoustic vibration along standard optical fiber detection. In general the sensing system measures phase changes of the received Rayleigh back-scattered signalin the fiber. Since the back-scattered signal intensity is decreased about tens of decibels in comparison to the forward propagating pulse power level, the received signal power level is very low. That is why the main limiting parameter of the system isthe power level of the back-scattered signal, which limits maximum achievable distance. For long reach sensing it is necessary to create high power optical pulses with short time-duration. Direct pulse amplification by erbium doped fiber amplifier (EDFA) is an issue because of the pulses low repetition rate. We have designed and verified a simple method using a holding beam for amplifying of pulses with low repetition rate by standard telecommunication EDFA booster instead of deployment
Czech name
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Czech description
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Project
<a href="/en/project/LO1401" target="_blank" >LO1401: Interdisciplinary Research of Wireless Technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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