Abstract
This paper presents a novel scheme to generate and detect Brillouin dynamic grating in a polarization-maintaining optical fiber based on one laser source. Precise measurement of Brillouin dynamic grating spectrum is achieved benefiting from that the pump, probe and readout waves are coherently originated from the same laser source. Distributed discrimination of strain and temperature is also achieved with high accuracy.
Highlights
Stimulated Brillouin scattering (SBS) occurs when a pump wave and a probe wave counterpropagate in an optical fiber, where the frequency of the probe is lower than that of the pump by Brillouin frequency [1]
When a readout wave polarized in orthogonal to the pump/probe waves is launched into the polarization-maintaining optical fiber (PMF), a strong diffraction by the Brillouin dynamic grating (BDG) occurs when the readout wave has a frequency deviation from the pump
RF1 was fixed at the measured νB so that BDG was maximized
Summary
Stimulated Brillouin scattering (SBS) occurs when a pump wave and a probe wave counterpropagate in an optical fiber, where the frequency of the probe is lower than that of the pump by Brillouin frequency (νB) [1]. The accuracy of the birefringence-determined frequency deviation (fyx) is limited by relative frequency fluctuation among multiple lasers, the accuracy could be somehow improved by time-consuming averaging process. Utilizing the one-laser scheme with Brillouin optical correlation domain analysis (BOCDA) technique [7,8], distributed discrimination of strain and temperature is achieved successfully with high accuracy. In this aspect, the new scheme avoids the difficulty of strict synchronization in simultaneous frequency modulations of pump, probe, and readout waves, which is required in previous two-laser scheme [7,8] as explained in detail in Appendix. The one-laser-based scheme is superior to the previous studies from the view point of configuration complexity and cost, because a single function generator is sufficient in the one-laser-based scheme to provide synchronized simultaneous frequency modulations to all the three waves
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
