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8 May 2008 Optimal laser diode operating mode with unstable operating temperature in turbulent atmosphere
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The aim of this paper is to design measuring method for determining applicability of picked laser diode in the optical wireless communications. Chosen laser diode must operate to not debase received optical signal quality and dynamics in optical wireless link. We are focusing on the processes in the optical links which are influenced by thermal effects. Varying laser diode's operating temperature and thermal fluctuations in atmospheric transmission media, in which the information carried by laser beam is propagating, are considered as the most significant thermal events in optical wireless communications. As mentioned before, the influence of operating temperature for laser diode's light emission has to be taken into account. The operation temperature affects on the physical properties of laser diode. Transmitting laser beam is collimated by transmitting lens but in case of laser diode's operating temperature vary the change in irradiation characteristics can occurs as an issue in optical wireless links because the distance between laser diode and transmitting lens can't be adapted by the reason of laser beam divergence settings. Atmospheric turbulence influence on spectrum and laser beam geometry of laser beam is investigated. In terms of results' evaluation we can determine when detected signal is acceptable or it doesn't fulfill conditions for signal in optical wireless communications.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lucie Dordova and Otakar Wilfert "Optimal laser diode operating mode with unstable operating temperature in turbulent atmosphere", Proc. SPIE 6997, Semiconductor Lasers and Laser Dynamics III, 69971G (8 May 2008);


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