A Weak-FBG Sensor Demodulation System Based on a DBR-SOA Tunable Laser

Compared with a conventional Fiber Bragg Grating (FBG), a Weak Fiber Bragg Grating (WFBG) sensor system can achieve comprehensive and distributed monitoring of various physical parameters. A WFBG demodulation system based on a Distributed Bragg Reflector (DBR) - Semiconductor Optical Amplifier (SOA) tunable laser is innovatively designed and thoroughly evaluated in this study. This system exploits the unique characteristics of a DBR laser with an integrated SOA to achieve precise tuning of output wavelengths and optical power. The chip-level integrated SOA acts as an optical modulator for ns-level optical pulses generation. This study has paved a way towards a compact, low power consumption, and cost-effective novel equipment for the distributed fiber optic sensing.