Abstract

This paper reports a distributed fiber optic sensing technique through microwave assisted separation and reconstruction of optical interferograms in spectrum domain. The approach involves sending a microwave-modulated optical signal through cascaded fiber optic interferometers. The microwave signal was used to resolve the position and reflectivity of each sensor along the optical fiber. By sweeping the optical wavelength and detecting the modulation signal, the optical spectrum of each sensor can be reconstructed. Three cascaded fiber optic extrinsic Fabry-Perot interferometric sensors were used to prove the concept. Their microwave-reconstructed interferogram matched well with those recorded individually using an optical spectrum analyzer. The application in distributed strain measurement has also been demonstrated.

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    [CrossRef]
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2012

2011

2010

2008

1996

1994

R. Passy, N. Gisin, J.-P. von der Weid, and H. Gilgen, “Experimental and theoretical investigations of coherent OFDR with semiconductor laser sources,” J. Lightwave Technol.12(9), 1622–1630 (1994).
[CrossRef]

1981

W. Eickhoff and R. Ulrich, “Optical frequency domain reflectometry in single‐mode fiber,” Appl. Phys. Lett.39(9), 693–695 (1981).
[CrossRef]

Bao, X.

Chen, L.

Dong, B.

Dong, Y.

Duan, D.-W.

T. Zhu, D. Wu, M. Liu, and D.-W. Duan, “In-line fiber optic interferometric sensors in single-mode fibers,” Sensors (Basel)12(12), 10430–10449 (2012).
[CrossRef] [PubMed]

Eickhoff, W.

W. Eickhoff and R. Ulrich, “Optical frequency domain reflectometry in single‐mode fiber,” Appl. Phys. Lett.39(9), 693–695 (1981).
[CrossRef]

Gilgen, H.

R. Passy, N. Gisin, J.-P. von der Weid, and H. Gilgen, “Experimental and theoretical investigations of coherent OFDR with semiconductor laser sources,” J. Lightwave Technol.12(9), 1622–1630 (1994).
[CrossRef]

Gisin, N.

R. Passy, N. Gisin, J.-P. von der Weid, and H. Gilgen, “Experimental and theoretical investigations of coherent OFDR with semiconductor laser sources,” J. Lightwave Technol.12(9), 1622–1630 (1994).
[CrossRef]

Gong, J.

Guemes, A.

Han, M.

Huang, S. Y.

Lally, E.

LeBlanc, M.

Li, X.

Liang, R.

Liu, D.

Liu, M.

T. Zhu, D. Wu, M. Liu, and D.-W. Duan, “In-line fiber optic interferometric sensors in single-mode fibers,” Sensors (Basel)12(12), 10430–10449 (2012).
[CrossRef] [PubMed]

Measures, R. M.

Ohn, M.

Othonos, A.

Passy, R.

R. Passy, N. Gisin, J.-P. von der Weid, and H. Gilgen, “Experimental and theoretical investigations of coherent OFDR with semiconductor laser sources,” J. Lightwave Technol.12(9), 1622–1630 (1994).
[CrossRef]

Shillig, T. J.

Shum, P. P.

Sun, Q.

Ulrich, R.

W. Eickhoff and R. Ulrich, “Optical frequency domain reflectometry in single‐mode fiber,” Appl. Phys. Lett.39(9), 693–695 (1981).
[CrossRef]

von der Weid, J.-P.

R. Passy, N. Gisin, J.-P. von der Weid, and H. Gilgen, “Experimental and theoretical investigations of coherent OFDR with semiconductor laser sources,” J. Lightwave Technol.12(9), 1622–1630 (1994).
[CrossRef]

Wang, A.

Wang, D. Y.

Wang, J.

Wang, W.

Wo, J.

Wu, D.

T. Zhu, D. Wu, M. Liu, and D.-W. Duan, “In-line fiber optic interferometric sensors in single-mode fibers,” Sensors (Basel)12(12), 10430–10449 (2012).
[CrossRef] [PubMed]

Zhang, J.

Zhang, Z.

Zhu, T.

T. Zhu, D. Wu, M. Liu, and D.-W. Duan, “In-line fiber optic interferometric sensors in single-mode fibers,” Sensors (Basel)12(12), 10430–10449 (2012).
[CrossRef] [PubMed]

Appl. Phys. Lett.

W. Eickhoff and R. Ulrich, “Optical frequency domain reflectometry in single‐mode fiber,” Appl. Phys. Lett.39(9), 693–695 (1981).
[CrossRef]

J. Lightwave Technol.

R. Passy, N. Gisin, J.-P. von der Weid, and H. Gilgen, “Experimental and theoretical investigations of coherent OFDR with semiconductor laser sources,” J. Lightwave Technol.12(9), 1622–1630 (1994).
[CrossRef]

W. Wang, J. Gong, B. Dong, D. Y. Wang, T. J. Shillig, and A. Wang, “A large serial time-division multiplexed fiber Bragg grating sensor network,” J. Lightwave Technol.30(17), 2751–2756 (2012).
[CrossRef]

Opt. Express

Opt. Lett.

Sensors (Basel)

T. Zhu, D. Wu, M. Liu, and D.-W. Duan, “In-line fiber optic interferometric sensors in single-mode fibers,” Sensors (Basel)12(12), 10430–10449 (2012).
[CrossRef] [PubMed]

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Figures (4)

Fig. 1
Fig. 1

Schematic illustration of the microwave assisted multiplexing of fiber optic interferometric sensors. PD: photo-detector

Fig. 2
Fig. 2

Schematic of the system configuration and implementation for concept demonstration. RF-AMP: radio frequency-amplifier, EOM: electro-optic modulator, EDFA: Erbium-doped fiber amplifier, PD: photo-detector, EFPI: extrinsic Fabry-Perot interferometer, P1/P2: Port 1/Port 2

Fig. 3
Fig. 3

(a) Time domain signal after applying a complex inverse Fourier transform to the microwave spectrum with the center wavelength of the tunable filter set to be 1552 nm, (b), (c) and (d) Normalized microwave-reconstructed optical interferograms of the three EFPIs in comparison with their spectra measured individually using an OSA, respectively.

Fig. 4
Fig. 4

(a) Distributed strain measurement using three multiplexed EFPI sensors, where strain is applied on EFPI #2 only, (b) Interferogram shift of the EFPI #2 as a function of applied axial strain. Inset: Interferograms of EFPI #2 at various applied strains.

Equations (2)

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Γ j = I 0 [ 1+Mcos( ω(t+ τ j ) ) ] R j
R j ( λ m )= R j1 + R j2 +2 R j1 R j2 cos( 2π λ m OP D j + ϕ j )

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