COMMENT
fibre pigtails, in which a short optical fibre is permanently aligned and attached to the detector. Fibre-coupled APDs simplify optical alignment, reduce coupling losses, and speed integration into fibre-based systems.
Applying APDs in infrared systems Infrared sensing plays a central role in modern technology. In laser range finders, APDs detect reflected pulses to calculate distance with high accuracy. In LiDAR systems, their fast temporal response supports dense three-dimensional mapping. In fibre-optic network diagnostics, Optical Time-Domain Reflectometry (OTDR) systems use APDs to analyse weak backscattered signals, enabling fault location and network assessment.
Sensitivity and practical performance
A detector’s sensitivity reflects its ability to generate a clean signal from faint light. In APDs, sensitivity depends on quantum efficiency, dark current, gain and excess noise. By combining high speed with strong low-light performance, APDs bridge the gap between simple photodiodes and photomultiplier tubes.
By understanding APD terminology and
performance trade-offs, you can design detection systems that balance speed, noise and sensitivity. Whether developing a LiDAR receiver, a fibre-optic transceiver, or a
custom infrared sensor module, a solid grasp of APD fundamentals supports precise and reliable infrared detection.
ATC SEMITEC – the little extra help
that makes a big difference
From concept to completion, ATC Semitec
is your go-to partner for all your temperature monitoring needs. With over 25 years
technical expertise and cutting edge solutions – trust us to provide the extra support that makes the difference in your biggest projects.
01606 871680
smart@atcsemitec.co.uk atcsemitec.co.uk
JULY/AUGUST 2026 | ELECTRONICS FOR ENGINEERS 7
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