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Excelitas’ (Waltham, MA) new HeliX Silicon Avalanche Photodiode (APD) Module is a compact, easy-to-use, analogue low-light-level detection (L³D) module employing Excelitas’ Si APD chips. The detector is in a hermetic TO package, mounted on a practical OEM-based PCB that includes high-voltage power supply, temperature compensation, a low-noise transimpedance amplifier, APD bias monitor and micro- controller. The preamplifier gain is optimized to obtain maximum dynamic range and linearity with the APD at gain adjustable operating voltage. It optimises APD operation in key performance parameters such as higher sensitivity, and better signal-to-noise ratio across the 400nm – 1100nm wavelength range.

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