Improvement of photodetection quantum efficiency by noiseless optical preamplification
- 23 January 1995
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 66 (4) , 399-401
- https://doi.org/10.1063/1.114201
Abstract
We demonstrate experimentally that a phase‐sensitive optical parametric amplifier used to amplify the incoming optical signal on a lossy photodiode improves the noise figure of detection. At high parametric gains this noise figure tends to 0 dB corresponding to a detection quantum efficiency approaching 100%. This result contrasts with the performance of preamplification by a classical laserlike amplifier in which the noise figure tends to 3 dB giving a saturation of the detection quantum efficiency at 50%.Keywords
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