Single-Photon Avalanche Diodes (SPAD) for 1550 nm wavelength can have InGaAs/InP structure similar to that of Avalanche PhotoDiodes of fiber optic systems, but for optimizing the device structure radically different criteria must be adopted. Such criteria are here discussed and a complete experimental characterization of the fabricated device is reported. Remarkable performance is verified also at moderately low temperature, as achieved with Peltier coolers.
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