A repeater-less Brillouin optical time-domain analyzer (BOTDA) with 157.68km sensing range is demonstrated, using
the combination of random fiber laser Raman pumping and low-noise laser-diode-Raman pumping. With optical pulse
coding (OPC) and Non Local Means (NLM) image processing, temperature sensing with ±0.70°C uncertainty and 8m
spatial resolution is experimentally demonstrated. The image processing approach has been proved to be compatible with
OPC, and it further increases the figure-of-merit (FoM) of the system by 57%.
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