tailieunhanh - Báo cáo hóa học: "Research Article Application of Single-Mode Fiber-Coupled Receivers in Optical Satellite to High-Altitude Platform Communications"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Application of Single-Mode Fiber-Coupled Receivers in Optical Satellite to High-Altitude Platform Communications | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 864031 7 pages doi 2008 864031 Research Article Application of Single-Mode Fiber-Coupled Receivers in Optical Satellite to High-Altitude Platform Communications Franz Fidler and Oswald Wallner Institute of Communications and Radio-Frequency Engineering Vienna University of Technology Gusshausstrasse 25 389 1040 Vienna Austria Correspondence should be addressed to Franz Fidler ffidler@ Received 31 October 2007 Accepted 16 February 2008 Recommended by Shlomi Arnon In a free-space optical communication system employing fiber-optic components the phasefront distortions induced by atmospheric turbulence limit the efficiency with which the laser beam is coupled into a single-mode fiber. We analyze different link scenarios including a geostationary GEO satellite a high-altitude platform HAP and an optical ground station OGS . Singlemode coupled optically preamplified receivers allow for efficient suppression of background noise and highly sensitive detection. While GEO-to-OGS communication suffers from atmospheric turbulence we demonstrate that GEO-to-HAP communication allows for close to diffraction-limited performance when applying tip-tilt correction. Copyright 2008 F. Fidler and O. Wallner. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Free-space laser communications with its ability to transmit information via a collimated laser beam at high data rates using compact low-mass terminals while avoiding interference problems and without exhausting the radio-frequency bandwidths are a promising candidate to satisfy the ever increasing bandwidth demand associated with new communication services. While optical intersatellite links are already operable 1 laser .