Performance of the optical communication adaptive optics testbed

Details Performance of the optical communication adaptive optics testbed Performance of the optical communication adaptive optics testbed

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5892..358r&link_type=abstract

Free-Space Laser Communications V. Edited by Voelz, David G.; Ricklin, Jennifer C. Proceedings of the SPIE, Volume 5892, pp.

Physics

Optics

Scientific paper

We describe the current performance of an adaptive optics testbed for free space optical communication. This adaptive optics system allows for simulation of night and day-time observing on a 1 meter telescope with a 97 actuator deformable mirror. In lab-generated seeing of 2.1 arcseconds (at 0.5μm) the system achieves a Strehl of 21% at 1.064μm (210nm RMS wavefront). Predictions of the system's performance based on real-time wavefront sensor telemetry data and analytical equations are shown to agree with the observed image performance. We present experimentally measured gains in communications performance of 2-4dB in the received signal power when AO correction is applied in the presence of high background and turbulence at an uncoded bit error rate of 0.1. The data source was a 100Mbps on-offkeyed signal detected with an IR-enhanced avalanche photodiode detector as the receiver.

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