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Título:
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Capacity of coherent laser downlinks
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Autor/a:
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Belmonte Molina, Aniceto
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció |
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Abstract:
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Accurate knowledge of information data capacity between a spacecraft and optical ground stations is of utmost importance for assessing the feasibility of laser downlinks in future high bandwidth communication systems from space. For the additional cost and complexity of the downlink systems, there is a growing interest for the sensitivity and spectral efficiency potential of coherent optical receivers. But in practice, as the link includes part of the atmosphere, the potential of coherent receivers is seriously affected by phase distortions and fading to the link induced by clear-air turbulence. Conveniently, coherent channel-matched array receivers consisting of multiple subapertures can reduce signal fading. Also, wavefront distortions can be mitigated in principle with adaptive optics. Here we provide a comprehensive, unified analysis of these two fundamental techniques used in atmospheric downlink coherent system. Our results demonstrate how array technologies, as an alternative to adaptive optics, are expected to expand capacity of laser downlinks by tracking and correcting atmospherically distorted signals. |
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Abstract:
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Peer Reviewed |
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Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica
-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica
-Optics, Adaptive
-Optical communications
-Adaptive optics
-Channel-matched receivers
-Free-space coherent optical communications
-Satellite downlinks
-Space optical-systems
-Atmospheric-turbulence
-Performance analysis
-Equal-gain
-Receivers
-Diversity
-Communication
-Channels
-Arrays
-Comunicacions òptiques
-Sistemes òptics |
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Derechos:
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Tipo de documento:
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Artículo - Versión publicada
Artículo |
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Compartir:
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