Fig. 1. A Raman distributed optical fiber sensing experimental setup based on the demodulation of chaotic pulse clusters.

Fig. 2. Characterization of chaotic pulse clusters. (a) Power spectra of chaotic pulse clusters. (b) Optical spectra of chaotic pulse clusters. 3 dB line width is 0.0477 nm. (c) Chaotic pulse cluster signal time series. (d) A zoom of chaotic pulse cluster signal time series.

Fig. 3. Raman anti-Stokes scattering signal based on the chaotic pulse cluster demodulation over the (a) entire sensing fiber and (b) cross-correlation results for 30-cm and 60-cm FUTs.

Fig. 4. Reconstruction results of the localization experiments based on the chaotic pulse cluster detection under the (a) 30-cm FUT and (b) 60-cm FUT lengths.

Fig. 5. Temperature demodulation results using the chaotic pulse cluster demodulation. (a) Chaotic demodulation results. (b) Temperature measurement error bar.

Fig. 6. Relationship between the FWHM and spatial resolution.

Fig. 7. Error bars of the FWHM for the autocorrelation function under (a) 200 MHz and (b) 10 GHz bandwidths.