Fig. 1. Anti-Stokes and Stokes backscattered signal intensities (a) before the dispersion compensation and (b) after the dispersion compensation.

Fig. 2. Anti-Stokes backscattering signal intensity in both forward and backward directions.

Fig. 3. Experimental setup of double-ended RDTS. WDM, wavelength division multiplexer; APD, avalanche photodiode; DAC, high-speed data acquisition card; PC, personal computer.

Fig. 4. Temperature measurement results along the sensing fiber under the temperature control of (a) 65°C, (b) 60°C, (c) 55°C, (d) 50°C, (e) 45°C, and (f) 40°C.

Fig. 5. Temperature measurement results along the FUT.

Fig. 6. Temperature measurement results of FUTs. (a) Results of measured temperature before the dispersion compensation. (b) Results of measured temperature after the dispersion compensation. (c) The temperature accuracy before the dispersion compensation and after the dispersion compensation. (d) The uncertainty of temperature before and after the dispersion compensation.

Fig. 7. Temperature demodulation results in (a) the single-ended configuration system and (b) the double-ended configuration system.