Table 2.

Comparison of the proposed fast BOTDA schemes in this work

	[53] optical frequency-agile technique	[52] slope-assisted (SA) BOTDA	[50] Frequency comb-based sweep-free method	[54] OCC–BOTDA
Sampling Rate	~10 kHz	~ 100 Hz	~ 33 kHz	6.25 MHz
Sensing Accuracy	~ 5 μɛ	n/a	29 MHz	35 μɛ (with 30 points moving average)
Sensing Range	100 m	85 m	2 km	1 km