Enhanced and spatially equalized SNR in DAS via digital summation of complex Rayleigh speckles

Haniel Gabai, Avishay Eyal

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Fiber-optic Distributed Acoustic Sensing (DAS) make use of Rayleigh backscattering for measuring acoustic signals and vibrations which interact with the fiber along its entire length. However, as DAS methodologies are based on coherent interference of Rayleigh backscattered light, the SNR of each sensor in the array varies randomly along the fiber. Moreover, when long range sensing is implemented, acoustic signals which affect the far-end of the fiber are measured with lower SNR than those affecting the beginning of the fiber due to propagation losses. In this work we experimentally demonstrate a new approach, based on summation of complex Rayleigh spackles, which mitigates the above-mentioned effects. In addition, judicious application of the method along the fiber enables trading sensing range for spatially-uniform SNR without applying any mechanical nor structural changes to the fiber.

Original languageEnglish
Title of host publicationAsia-Pacific Optical Sensors Conference, APOS 2016
PublisherOSA - The Optical Society
ISBN (Print)9780960038053
StatePublished - 21 Jul 2014
EventAsia-Pacific Optical Sensors Conference, APOS 2016 - Shanghai, China
Duration: 11 Oct 201614 Oct 2016

Publication series

NameOptics InfoBase Conference Papers


ConferenceAsia-Pacific Optical Sensors Conference, APOS 2016


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