Dynamic Strain Measurement of 10-km Fiber With Frequency-Swept Pulsed BOTDA

We propose a high-speed, dynamic strain measurement with random access based on real-time Brillouin time-domain analysis of correlated gain measured with an oscilloscope. A frequency-swept probe obtains the Lorentzian-shaped correlated gain in a time domain. We simply monitor the peak time change, which relates to the Brillouin frequency shift. We achieved the theoretical sampling rate limit of 10 kilo-points/s in 10-km fiber. To the best of our knowledge, this is the first report to achieve the theoretical sampling rate and a measurement range of over 10 km with a Brillouin-based dynamic strain measurement.