The distributed Brillouin sensor system based on offset locking two DFB lasers

In this paper, we demonstrated a distributed Brillouin sensor based on the offset locking of two 1550nm DFB lasers. We use PID controller and optical delay line to lock and tune the frequency difference between two DFB lasers and we also use lock in amplifier to stabilize the DC level of the EOM. The power depletion in the Brillouin scattering has been studied to show optimized strain and temperature accuracy. With this sensor system, we can get the spatial resolution which is 1m with temperature resolution of < 1°C.

[1]  K. Shimizu,et al.  Development of a distributed sensing technique using Brillouin scattering , 1995 .

[2]  L. Thévenaz,et al.  Simple distributed fiber sensor based on Brillouin gain spectrum analysis. , 1996, Optics letters.

[3]  K. Yoshino,et al.  Frequency stabilization of millimeter-wave subcarrier using laser heterodyne source and optical delay line , 2001, IEEE Photonics Technology Letters.

[4]  T. Horiguchi,et al.  Distributed-temperature sensing using stimulated Brillouin scattering in optical silica fibers. , 1990, Optics letters.

[5]  Xiaoyi Bao,et al.  Influence of transient phonon relaxation on the Brillouin loss spectrum of nanosecond pulses. , 2006, Optics letters.

[6]  D. A. Humphreys.  Integrated-optic system for high-speed photodetector bandwidth measurements , 1989 .

[7]  Effect of optical phase on a distributed Brillouin sensor at centimeter spatial resolution. , 2005, Optics letters.

[8]  R.W. Smith,et al.  Design and qualification of hermetically packaged lithium niobate optical modulator , 1997, 1997 Proceedings 47th Electronic Components and Technology Conference.

[9]  Anthony W. Brown,et al.  Strain measurement in a concrete beam by use of the Brillouin-scattering-based distributed fiber sensor with single-mode fibers embedded in glass fiber reinforced polymer rods and bonded to steel reinforcing bars. , 2002, Applied optics.

[10]  X. Bao,et al.  32-km distributed temperature sensor based on Brillouin loss in an optical fiber. , 1993, Optics letters.

[11]  Nicol A. Heron,et al.  Experimental and theoretical studies on a distributed temperature sensor based on Brillouin scattering , 1995 .