Abstract

Optical preamplification has been used in a fiber-optic distributed temperature sensor based on spontaneous Brillouin scattering and the use of direct detection, resulting in improved signal-to-noise ratios. The fiber-based optical preamplifier system comprises a three-port circulator, an erbium-doped fiber amplifier with a small-signal gain of 27 dB, and a fiber Bragg grating with 47-GHz bandwidth. An improvement of 17 dB in the optical signal-to-noise ratio for the Brillouin signal is demonstrated in a 23-km sensor. The limit to the signal-to-noise ratio is attributed to spontaneous–spontaneous beat noise generated at the photodetector by amplified spontaneous emission from the optical amplifier.

© 2000 Optical Society of America

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References

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  1. K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
    [CrossRef]
  2. D. Culverhouse, F. Farahi, and D. A. Jackson, Electron. Lett. 25, 913 (1989).
    [CrossRef]

1996 (1)

K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
[CrossRef]

1989 (1)

D. Culverhouse, F. Farahi, and D. A. Jackson, Electron. Lett. 25, 913 (1989).
[CrossRef]

Culverhouse, D.

D. Culverhouse, F. Farahi, and D. A. Jackson, Electron. Lett. 25, 913 (1989).
[CrossRef]

De Souza, K.

K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
[CrossRef]

Farahi, F.

D. Culverhouse, F. Farahi, and D. A. Jackson, Electron. Lett. 25, 913 (1989).
[CrossRef]

Jackson, D. A.

D. Culverhouse, F. Farahi, and D. A. Jackson, Electron. Lett. 25, 913 (1989).
[CrossRef]

Lees, G. P.

K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
[CrossRef]

Newson, T. P.

K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
[CrossRef]

Wait, P. C.

K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
[CrossRef]

Electron. Lett. (2)

K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
[CrossRef]

D. Culverhouse, F. Farahi, and D. A. Jackson, Electron. Lett. 25, 913 (1989).
[CrossRef]

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Figures (7)

Fig. 1
Fig. 1

Schematic of the preamplifier system.

Fig. 2
Fig. 2

Schematic of the experimental setup.

Fig. 3
Fig. 3

EDFA gain versus pump power.

Fig. 4
Fig. 4

Grating profile.

Fig. 5
Fig. 5

rms noise of the detection system without (top) and with (bottom) optical preamplification.

Fig. 6
Fig. 6

Full-range unamplified (a) and (b) optically amplified Brillouin signals averaged 4192 times.

Fig. 7
Fig. 7

Unamplified (a) and optical amplified (b) Brillouin signal at the far end of sensing fiber, averaged 40,960 times. Temperature resolution is limited by receiver noise.

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