Research Article
Enhanced Free Space Beam Capture by Improved Optical Tapers
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@INPROCEEDINGS{10.1007/978-3-642-11731-2_13, author={Tim Bartley and Bettina Heim and Dominique Elser and Denis Sych and Metin Sabuncu and Christoffer Wittmann and Norbert Lindlein and Christoph Marquardt and Gerd Leuchs}, title={Enhanced Free Space Beam Capture by Improved Optical Tapers}, proceedings={Quantum Communication and Quantum Networking. First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised Selected Papers}, proceedings_a={QUANTUMCOMM}, year={2012}, month={10}, keywords={Optical taper free space communication beam-jitter atmospheric optics random media quantum key distribution}, doi={10.1007/978-3-642-11731-2_13} }- Tim Bartley
Bettina Heim
Dominique Elser
Denis Sych
Metin Sabuncu
Christoffer Wittmann
Norbert Lindlein
Christoph Marquardt
Gerd Leuchs
Year: 2012
Enhanced Free Space Beam Capture by Improved Optical Tapers
QUANTUMCOMM
Springer
DOI: 10.1007/978-3-642-11731-2_13
Abstract
In our continuous variable quantum key distribution (QKD) scheme, the homodyne detection set-up requires balancing the intensity of an incident beam between two photodiodes. Realistic lens systems are insufficient to provide a spatially stable focus in the presence of large spatial beam-jitter caused by atmospheric transmission. We therefore present an improved geometry for optical tapers which offer up to four times the angular tolerance of a lens. The effective area of a photodiode can thus be increased, without decreasing its bandwidth. This makes them suitable for use in our free space QKD experiment and in free space optical communication in general.
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