Abstract

We demonstrate the distributed measurement of Brillouin dynamic grating spectra in a polarization-maintaining fiber based on time-domain analysis. Local reflection spectra of the Brillouin dynamic grating are acquired by synchronized propagation of the pump and the probe pulses based on the map of the Brillouin frequency distribution. Large temperature sensitivity as high as 50.9  MHz/°C is observed with 2 m spatial resolution in 100 m range.

© 2009 Optical Society of America

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References

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  1. G. P. Agrawal, Nonlinear Fiber Optics, 2nd ed. (Academic, 1995).
  2. K. Y. Song, W. Zou, Z. He, and K. Hotate, Opt. Lett. 33, 926 (2008).
    [CrossRef] [PubMed]
  3. W. Zou, Z. He, K. Y. Song, and K. Hotate, Opt. Lett. 34, 1126 (2009).
    [CrossRef] [PubMed]
  4. W. Zou, Z. He, and K. Hotate, Opt. Express 17, 1248 (2009).
    [CrossRef] [PubMed]
  5. V. P. Kalosha, W. Li, F. Wang, L. Chen, and X. Bao, Opt. Lett. 33, 2848 (2008).
    [CrossRef] [PubMed]

2009 (2)

2008 (2)

Agrawal, G. P.

G. P. Agrawal, Nonlinear Fiber Optics, 2nd ed. (Academic, 1995).

Bao, X.

Chen, L.

He, Z.

Hotate, K.

Kalosha, V. P.

Li, W.

Song, K. Y.

Wang, F.

Zou, W.

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Figures (6)

Fig. 1
Fig. 1

Schematic view of the time-domain measurement of Brillouin dynamic grating spectrum (BDGS). Note that the Brillouin gain spectrum (BGS) and the BDGS are measured by sweeping the optical frequencies of pump2 and probe, respectively.

Fig. 2
Fig. 2

Experimental setup: LD, laser diode; SSBM, single-sideband modulator; EDFA, Er-doped fiber amplifier; PBS, polarization beam splitter; Pol., polarizer; EOM, electro-optic modulator. The inset shows the structure of the fiber under test.

Fig. 3
Fig. 3

(a) Measured distribution maps of the Brillouin frequency ( ν B ) along the slow and the fast axes of the FUT. (b) Optical spectrum showing the reflection by the BDG measured at the position of PD2 in the setup. Note that the BDG disappears when pump1 is off.

Fig. 4
Fig. 4

(a) Selected traces (raw data) of the BDGS measurement representing the local reflection amplitude of the BDG along the position at different Δ ν . (b) Selected BDGS representing the reflection amplitude with respect to Δ ν at different positions. Note that this plot is composed by arranging the traces in Fig. 4a.

Fig. 5
Fig. 5

(a) Measured distribution maps of Δ ν P along the FUT at different temperatures on 2 m test section (dashed box). Notice that the frequency offset between pump1 and pump2 was kept at 10.845 GHz during the measurement. (b) Δ ν P shift as a function of temperature change with a linear fit.

Fig. 6
Fig. 6

Comparison of the BDGS distribution in 3D (top) and the relative powers of the probe reflection (bottom) with the test section at (a) 25.5 ° C and (b) 32.5 ° C .

Equations (2)

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ν B = 2 n x ν V a c = 2 n y ( ν + Δ ν ) V a c ,
Δ ν = Δ ν B ν B ν = Δ n n ν ,

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