Effect of scintillations is serious problems in optical systems which require the atmospheric propagation, the optimization of optical system to minimize the effects of scintillation have been examined using the simulation of propagation in atmospheric turbulence. The analytic studies of scintillation index of LG beams show that LG beams have less scintillation than Gaussian beams. However, in these researches, the diameter of receiving aperture was set as point receiver without considering the effects of aperture averaging, which is phenomenon that reduced scintillations over finite aperture. In this paper, considering size of a receiving aperture, the propagation losses and the scintillation index of LG beams are simulated. Also, for practical applications, propagation properties of "quantized" LG(5,1) beams simulated. As a result of the examination, the propagation losses and the scintillation index of LG beams is smaller than those of Gaussian beams. By applying LG beams for optical wireless communications, it is expected to improve better the effect of scintillations than using Gaussian beams. The result is that the scintillation index of quantized LG beams is equal to those of LG beams, and it suggested that quantized LG beams can be treat the quantized LG beams the same as LG beams.
Effect of scintillations is a serious problem in optical systems which require atmospheric propagation, and various
examinations have been implemented to keep communication quality. But combination of optical conditions to optimize
communication capability has not been examined. In this paper, optimization of the combination of optical variables, for
example transmission beam radius of carrier wave and diameter of receiving aperture, is conducted by using the lognormal
distribution model in weak turbulence and the gamma-gamma distribution model, which is suitable for weak to
strong turbulence, in moderate to strong turbulence with considering aperture averaging. As a result of the examination,
the optimum combination have been successfully found. Moreover, to investigate the propagation mode of carrier wave,
comparison of propagation attenuation between Gaussian beam wave and Laguerre-Gaussian beam wave and evaluation
of communication quality in optimized optical condition obtained from above-mentioned examination, will be done. The
result is that the propagation loss of any of the Laguerre-Gaussian beam waves are smaller than those of the Gaussian
beam waves. It is also observed that the propagation loss of (5, 1) Laguerre-Gaussian beam wave is particularly small
among those.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.