Receiver dead time in non-line-of-sight ultraviolet communications

Robert J. Drost; Paul L. Yu; Gang Chen; Brian M. Sadler

doi:10.1117/12.2053419

28 May 2014 Receiver dead time in non-line-of-sight ultraviolet communications

Robert J. Drost, Paul L. Yu, Gang Chen, Brian M. Sadler

Proceedings Volume 9114, Advanced Photon Counting Techniques VIII; 91140Q (2014) https://doi.org/10.1117/12.2053419
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

Advances in ultraviolet (UV) source, detector, and solar-blind filtering technologies have recently spurred significant research interest in non-line-of-sight (NLOS) UV communications. Although this research has primarily focused on short-range applications, the achievable range of a NLOS UV system can be extended (e.g., up to a few kilometers) with the use of a pulsed UV laser transmitter. However, the short-duration high-intensity pulses of such a laser have the potential to overwhelm the response time of photomultiplier detectors, which are often employed by a receiver to implement high-sensitivity photon-counting detection. In particular, after the detection of a photon, there exists a period of time, called dead time, during which the detector is unable to detect subsequently impinging photons, resulting in missed photon detections and, hence, altered received signal statistics relative to an ideal photon counter. In this paper, we examine the effect of receiver dead time on a NLOS UV system. We extend an existing UV NLOS channel model to account for nonzero dead time at the receiver and then use this extended model to examine the significance of dead-time effects for various representative system configurations. The results suggest the importance of accounting for dead time when designing practical UV communication systems.

Citation Download Citation

Robert J. Drost, Paul L. Yu, Gang Chen, and Brian M. Sadler "Receiver dead time in non-line-of-sight ultraviolet communications", Proc. SPIE 9114, Advanced Photon Counting Techniques VIII, 91140Q (28 May 2014); https://doi.org/10.1117/12.2053419

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