High spatial resolution, low-noise Brillouin dynamic gratings reflectometry based on digital pulse compression

A. Bergman, T. Langer, M. Tur

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Digital pulse compression was used to enhance the performance of optical time-domain reflectometry, employing Brillouin dynamic gratings (BDGs) in polarization-maintaining fibers. The fundamental and unique issues in BDG field-reflection are addressed, and rules for proper selection of the coding and detection techniques are formulated. While coding in BDG applications generally requires coherent processing of the reflection, conditions are established for use of direct detection. A 256-bit Golay complementary unipolar probe code is used to demonstrate an eightfold signal-to-noise ratio enhancement in the measurement of the Brillouin gain spectrum (BGS), with a spatial resolution of 2 cm and a full-BGS acquisition rate of 133 1/3 kHz, resulting in an equivalent reduction in the estimation error of small Brillouin frequency shifts.

Original languageEnglish
Pages (from-to)3643-3646
Number of pages4
JournalOptics Letters
Volume41
Issue number15
DOIs
StatePublished - 1 Aug 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 Optical Society of America.

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