Abstract
We demonstrated a long-range and centimeter-spatial-resolution optical frequency domain reflectometry (OFDR) system based on an ultra-linear broadband optical frequency sweep. The high nonlinear sweeping effect of the distributed feedback (DFB) diode laser was suppressed by a pre-distortion method, ensuring that the injection-locking process remained stable during fast tuning over a large span. An optical linear frequency sweep (LFS) with a sweep range and sweep rate of up to 60 GHz and 15 THz/s, respectively, was ultimately obtained by optimizing the injection-locking system. The high performance OFDR based on the proposed LFS achieved a sampling spatial resolution of 1.71 mm. Furthermore, distributed strain sensing was implemented with high-spatial resolutions of about 5 cm and 7 cm in the measurement range over 1 km and 2 km, respectively.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Guangdong Science Technology Department
Shenzhen Science and Technology Program
Shenzhen Key Laboratory of Ultrafast Laser Micro/Nano Manufacturing
Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things.
Subject
Atomic and Molecular Physics, and Optics
Cited by
4 articles.
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