In this letter, we report a simple innovative and CMOS compatible planar Separated-Absorption-Multiplication (SAM) amorphous Si1-xGex avalanche photo diode (SAMAPD) for short-distance optical-fiber communication systems, The spectral response of this SAMAPD extends up to 0.93 mu m with a bandwidth of 1.9 GHz. Due to its low-temperature process budget it can be post-fabricated in a CMOS wafer, which makes it ideal for building monolithic submicron CMOS fiber optic detector systems.