BOTDA using OFDM channel estimation
Can Zhao, Ming Tang, Liang Wang, Hao Wu, Zhiyong Zhao, Yunli Dang,, Jiadi Wu, Songnian Fu, Deming Liu, and Perry Ping Shum
TL;DR
This paper introduces a new BOTDA system using IM-DD-OFDM probe signals that eliminates the need for frequency sweep, analyzing PAPR effects and demonstrating high spatial resolution over 2 km fiber.
Contribution
It presents a novel BOTDA approach with OFDM channel estimation and direct detection, avoiding traditional frequency sweep methods.
Findings
Achieved 25m spatial resolution over 2 km fiber
Analyzed PAPR effects on BGS recovery
Demonstrated effective Brillouin frequency shift detection
Abstract
A novel Brillouin optical time-domain analysis (BOTDA) system is proposed using intensity-modulated optical orthogonal frequency division multiplexing probe signal and direct detection (IM-DD-OOFDM) without frequency sweep operation. The influence of peak to average power ratio (PAPR) of OFDM probe signal on the recovery of Brillouin gain spectrum (BGS) is analyzed in theory and experiment. The complex BGS is reconstructed by channel estimation algorithm and Brillouin frequency shift (BFS) is located by curve fitting of intensity spectrum. The IM-DD-OOFDM BOTDA is demonstrated experimentally with 25m spatial resolution over 2 km standard single mode fiber.
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Taxonomy
TopicsOptical Network Technologies · Advanced Fiber Optic Sensors · Advanced Photonic Communication Systems