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We demonstrate a hybrid distributed fiber sensing system for multi-parameterdetection. The integration of phase-sensitive optical time domain reflectometry({\Phi}-OTDR) and Brillouin optical time domain reflectometry (B-OTDR) enablesmeasurement of vibration, temperature and strain. Exploiting the fast changingproperty of vibration and the static property of temperature and strain, thelaser pulse width and intensity are modulated and then injected into thesingle-mode sensing fiber proportionally, so that the three concernedparameters can be extracted simultaneously by only one photo-detector and dataacquisition channel. Combining with advanced data processing methods, themodulation of laser pulse brings additional advantages because of trade andbalance between the backscattering light power and nonlinear effect noise,which enhances the signal-to-noise ratio, and enables sub-meter level spatialresolution together with long sensing distance. The proposed method realizes upto 4.8 kHz vibration sensing with 3 m spatial resolution at 10 km standardsingle-mode fiber. And measurements of the distributed temperature and stressprofile along the same fiber with 80 cm spatial resolution are also achievedconcurrently.

Modulated Pulses Based High Spatial Resolution Distributed Fiber System for Multi-Parameter Sensing