One of the main working parts of any optical receiver is the photodetector (which converts optical power to an electric current). Either a PIN or APD (avalanche photodiode) photodetector can be used depending on the system performance objectives. Â This application notes demonstrates how to setup and measure (using OptiSystem) the receiver sensitivities of PIN and APD intensity-modulated direct-detection (IM-DD) systems, including: quantum-limited ideal PIN photodetection, thermal-noise limited PIN photodetection, thermal and shot-noise limited APD performance, and PIN photodetection with optical pre-amplification.
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