Abstract
We demonstrate multiphoton discrimination at a telecommunications wavelength with the readout frequency of by a charge-integration photon detector (CIPD). The CIPD consists of an InGaAs pin photodiode and a GaAs junction field effect transistor as a preamplifier in a charge-integration circuit, which is cooled to to reduce thermal noise. The quantum efficiency of the CIPD (the detector itself) is 80% for light, and the readout noise is measured as 0.26 electrons at . We can construct Poisson distributions of photocarrier numbers with distinct peaks at each photocarrier number, corresponding to a signal-to-noise ratio of about 3.
© 2006 Optical Society of America
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