FPGA IP Cores of Concurrent Filter for OTDR-distributed Fiber Optic Sensors

Distributed fiber optic sensors require processing data with high parallelism. This paper presents intelligent property (IP) cores of digital filters which process concurrent data for distributed fiber sensors of optical time domain reflectometry (OTDR). Soft cores of cumulative moving average and infinite impulse response (IIR) filter are introduced. With an architecture of concurrent filter, the IP cores are capable of denoising signals from up to 20000 sensing points and adapting to various sensor configurations. In experiments, the IP cores are instantiated in distributed temperature sensing (DTS) system and distributed vibration sensing (DVS) system with different parameter settings. The fluctuations of temperature and vibration have been monitored with the SNR of 45.6 dB and 19 dB respectively.