DET20 series bias photodetector for mW level optical power detection, using free space light input, the series of photodetectors without amplification circuit, with very low noise, the module using analog signal output.
The DET30 bias photodetector is a compact, unamplified, fiber-optic input, battery-powered detector with very low noise, and can be used to detect optical signals with ps-level pulse widths.
The spatial resolution is related to your optical pulse parameter setting, which is set according to the monitoring length of the fiber optic cable. 40km distance we can achieve 5m spatial resolution.