FANTANA Cooled Single-Photon Receiver

The FANTANA Cooled Single-Photon Receiver is an avalanche photodiode (APD) detector developed by Fantana GmbH (Vienna, Austria) for use in free-space optical laser communication links.^[1] It operates the APD in Geiger mode with active quench circuitry, and uses thermoelectric cooling to below -20 degrees C to reduce dark-count noise, enabling detection of the very low photon fluxes present on satellite-to-ground optical paths.^[1] The receiver is paired with Fantana's laser ranger terminal for beam stabilisation in full FSO communication systems.^[2] Operating wavelength is not published in available sources, and no on-orbit deployment heritage or named customer missions have been confirmed at time of research.