Fig. 1: The operation principle of an OCC-BTODA.
From: Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement
a The OCC probe wave is temporally cascaded by several short optical chirp segments in which the frequency is scanned from v1 to vN, while the pump pulse requires just single shot to obtain the distributed BGS along the FUT. b The frequency relationship between the pump pulse and the continuous probe wave
