The id220-FR-SMF from id Quantique (Carouge, Switzerland) provides a cost-effective tool for applications that require asynchronous photon detection. The cooled InGaAs/InP avalanche photodiode and associated electronics achieve low dark count and afterpulsing rates in free-running mode. The module operates at two detection probability levels of 10% and 20%, with a deadtime that can be set between 600ns and 25ms. Arrival time of photons is reflected by a 100ns TTL pulse available at the SMA connector; the timing resolution is as low as 250ps at 20% efficiency. A USB interface allows users to set the efficiency level and the deadtime. A standard FC/PC connector followed by a single mode fiber is provided as optical input.
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