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- W304042312 abstract "We present predicted and experimentally measured gains in communications performance of a laboratory-based, free-space optical communications system through the use of adaptive optics (AO). A commercially available avalanche photodiode detector (APD) is used in the receiver for signal detection. Background noise and atmospheric turbulence field conditions were simulated in the laboratory using an integration sphere and a specially designed heater. At an uncoded bit-error rate (BER) of 0.3, a 5- to 6-dB gain in the received signal power is shown when AO correction is applied in the presence of high background and turbulence. The data stream was a 100-megabits per second (Mbps) pseudo-random bit sequence (PRBS), on–off-keying (OOK)-modulated, 1064-nm laser pulse train. I. Introduction Free-space optical communication through atmospheric turbulence suffers due to distortion of the signal field distribution in the detector focal plane and the spreading of the signal intensity. These aberrations result in spot sizes in the focal plane that are several times diffraction limited for the aperture and require larger photodetectors to capture the required number of signal photons for the desired link performance. For uniformly distributed sky background intensity, the larger detector collects proportionally more background photons and results in degraded link performance. In general, larger-area detectors limit the data rate realizable due to the lower bandwidths and can contribute to temporal distortion of the received signal. By using adaptive optics (AO) techniques, the atmosphere-induced wavefront aberrations can be corrected, and near-diffraction-limited focused spot sizes can be realized. This would enable the use of smaller, high-speed detectors with better spatial discrimination against the unwanted background noise." @default.
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- W304042312 date "2005-05-01" @default.
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- W304042312 title "Improved Optical Communications Performance Using Adaptive Optics with an Avalanche Photodiode Detector" @default.
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