In this work, we analyze the effects of Brillouin gain and Brillouin frequency drifts on the accuracy of the differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA). In particular, we demonstrate numerically that the differential gain is highly sensitive to variations in the Brillouin gain and/or Brillouin shift occurring during the acquisition process, especially when operating with a small pulse pair duration difference. We also propose and demonstrate experimentally a method to compensate for these drifts and consequently improve measurement accuracy.
© 2013 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: January 4, 2013
Revised Manuscript: March 14, 2013
Manuscript Accepted: March 15, 2013
Published: April 24, 2013
Aldo Minardo, Romeo Bernini, and Luigi Zeni, "Limitations and strategies to improve measurement accuracy in differential pulse-width pair Brillouin optical time-domain analysis sensing," Appl. Opt. 52, 3020-3026 (2013)