Single-shot hybrid CP-$\varphi \text{OTDR}$/CP-BOTDA system for simultaneous distributed temperature/strain sensing

A real time simultaneous temperature and strain measurement based on hybrid chirped pulsed
$\phi$
-OTDR and BOTDA is demonstrated for the first time. The high accuracy of
$4.3\ \mu\varepsilon$
for strain and 0.32°C for temperature is achieved over 5 km non-uniform fiber.