A 100-km BOFDA Assisted by First-Order Bi-Directional Raman Amplification
Thomas Kapa, Andy Schreier, Katerina Krebber
Sensors · 2019
doi:10.3390/s19071527 (opens in a new tab)
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Abstract
We present, to our knowledge for the first time, a 100-km Brillouin Optical Frequency-Domain Analysis (BOFDA) employing a 200-km fiber loop. Compared to our previous publication, enhanced sensor length, sensor accuracy and spatial resolution are presented. The performance improvements are achieved by applying distributed Raman amplification (DRA) and a digital high-pass filter. We report on temperature measurements over sensing distances of 75 km and 100 km both with a 12.5-m spatial resolution. Temperature changes of 5 <inline-formula> <math display="inline"> <semantics> <mo>°</mo> </semantics> </math> </inline-formula>C have been measured along 75 km sensing fiber. A temperature change of 30 <inline-formula> <math display="inline"> <semantics> <mo>°</mo> </semantics> </math> </inline-formula>C has been detected at 99.5 km.
Abstract licence: CC BY
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