Phase-sensitive Optical Time Domain Reflectometer Assisted by First-order Raman Amplification for Distributed Vibration Sensing Over 100 km

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Martins, HF (Author) Other; Martin Lopez, S (Author) Other; Corredera, P (Author) Other; Filograno, ML (Author) Other; Frazao, O (Author) FCUP; Gonzalez Herraez, M (Author) Other

Journal

Title: Journal of Lightwave Technology

Vol. 32

Pages: 1510-1518

ISSN: 0733-8724

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 82 Citations

Scopus - 103 Citations

Other information

Authenticus ID: P-009-7YX

DOI: 10.1109/jlt.2014.2308354

Abstract (EN): In this study, the authors present an experimental and theoretical description of the use of first order Raman amplification to improve the performance of a Phase-sensitive optical time domain reflectometer (phi OTDR) when used for vibration measurements over very long distances. A special emphasis is given to the noise which is carefully characterized and minimized along the setup. A semiconductor optical amplifier and an optical switch are used to greatly decrease the intra-band coherent noise of the setup and balanced detection is used to minimize the effects of RIN transferred from the Raman pumps. The sensor was able to detect vibrations of up to 250 Hz (close to the limits set by the time of flight of light pulses) with a resolution of 10 m in a range of 125 km. To achieve the above performance, no post-processing was required in the fOTDR signal. The evolution of the fOTDR signal along the fiber is also shown to have a good agreement with the theoretical model.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9