Abstract
We demonstrate a balanced-homodyne LADAR receiver employing a phase-sensitive amplifier (PSA) to raise the effective photon detection efficiency (PDE) to nearly 100%. Since typical LADAR receivers suffer from losses in the receive optical train that routinely limit overall PDE to less than 50% thus degrading SNR, PSA can provide significant improvement through amplification with noise figure near 0 dB. Receiver inefficiencies arise from sub-unity quantum efficiency, array fill factors, signal-local oscillator mixing efficiency (in coherent receivers), etc. The quantum-enhanced LADAR receiver described herein is employed in target discrimination scenarios as well as in imaging applications. We present results showing the improvement in detection performance achieved with a PSA, and discuss the performance advantage when compared to the use of a phase-insensitive amplifier, which cannot amplify noiselessly.
| Original language | English |
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| Title of host publication | Quantum Communications and Quantum Imaging IX |
| DOIs | |
| State | Published - 2011 |
| Externally published | Yes |
| Event | Quantum Communications and Quantum Imaging IX - San Diego, CA, United States Duration: 24 Aug 2011 → 25 Aug 2011 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
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| Volume | 8163 |
| ISSN (Print) | 0277-786X |
Conference
| Conference | Quantum Communications and Quantum Imaging IX |
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| Country/Territory | United States |
| City | San Diego, CA |
| Period | 24/08/11 → 25/08/11 |
Keywords
- LADAR
- balanced homodyne detection
- coherent detection
- heterodyne LADAR
- phase-sensitive amplification