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PSP-BOTDA Utilizing Imaginary Part of Brillouin Gain Coefficient
B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition) Vol.J92-B No.11 pp.1788-1795
Publication Date: 2009/11/01
Online ISSN: 1881-0209
Print ISSN: 1344-4697
Type of Manuscript: PAPER
distributed fiber sensing,
Brillouin distributed measurment,
Full Text(in Japanese): PDF(624.4KB)
We have proposed a Phase Shift Pulse Brillouin Optical Time Domain Analysis (PSP-BOTDA) previously. This paper reports a new kind of PSP-BOTDA which uses both +π/2 and -π/2 phase shift pulses as its pump lights. It is shown that the Brillouin spectrum obtained by using this new PSP-BOTDA corresponds to the imaginary part of the Brillouin gain coefficient, and that it has linear frequency characteristics around the Brillouin frequency shift.