Patent · US Active

BOTDA system that combined optical pulse coding techniques and coherent detection

US8988671B2 · kind B2 · utility

4Cited by
1References
10Claims
0Family size

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Key dates

Filing dateJun 21, 2013
Grant dateMar 24, 2015
Priority date—
Expiry dateJun 21, 2033

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01K11/322
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A BOTDA system that combined optical pulse coding techniques and coherent detection includes a narrow linewidth laser, two polarization-maintaining couplers, microwave generator, two electro-optic modulators (EOMs), fiber under test, an optical circulator, a 3 dB coupler, a polarization scrambler, a pulse generator, a balance photodetector, an electrical spectrum analyzer, digital signal processing unit and a frequency shifter. The optical pulse coding techniques and coherent detection are simultaneously used in the invented system, which can be enhance the signal-to-noise ration (SNR), the measuring accuracy and the sensing distance of BOTDA. Moreover, the proposed system has the capacity of break interrogation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.