Fiber Strain Measurement for Wide Region Quasidistributed Sensing by Optical Correlation Sensor with Region Separation Techniques

Table 1

The number of cascadable regions limited by different cases (with 1% reflectivity IPRs).

Conditions	Light source	20 GHz
		ML-LD
	Pulse width d	10 ps
	Period of Pulse Tm	50 ps
	Range of optical delay line Td	350 ps
	Input Power I0	10.7 mW
	Detection limit $I_{\min \hspace{0.17em}}$	10 $\mu$W
Number of cascadable sensing regions	Number of Case 1	5
	Number of Case 2	6
	Minimum number	5
	Dynamic measurable time range of each region	10 ps