an indium gallium arsenide (InGaAs) avalanche photodiode (APD) module that is designed for light level detection and/or signal transmission applications. The new 50 µm active area device features low dark current, low back reflection, and high speed (2.5 Ghz) in a miniature package. With spectral response from 1000 nm to 1650 nm at 25 degrees C, the typical operational wavelength is 1550 nm.