Optical wireless communication through fog in the presence of pointing errors
- 20 August 2003
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 42 (24), 4946-4954
- https://doi.org/10.1364/ao.42.004946
Abstract
Terrestrial optical wireless communication (OWC) is emerging as a promising technology, which makes connectivity possible between high-rise buildings and metropolitan and intercity communication infrastructures. A light beam carries the information, which facilitates extremely high data rates. However, strict alignment between the transmitter and the receiver must be maintained at all times, and a pointing error can result in a total severance of the communication link. In addition, the presence of fog and haze in the propagation channel hampers OWC as the small water droplets scatter the propagating light. This causes attenuation due to the resultant spatial, angular, and temporal spread of the light signal. Furthermore, the ensuing low visibility may impede the operation of the tracking and pointing system so that pointing errors occur. We develop a model of light transmission through fogs of different optical densities and types using Monte Carlo simulations. Based on this model, the performance of OWC in fogs is evaluated at different wavelengths. The handicap of a transceiver pointing error is added to the model, and the paradoxically advantageous aspects of the transmission medium are exposed. The concept of a variable field of view receiver for narrow-beam OWC is studied, and the possibility of thus enhancing communication system performance through fog in an inexpensive and simple way is indicated.Keywords
This publication has 26 references indexed in Scilit:
- Free-space optical communication through atmospheric turbulence channelsIEEE Transactions on Communications, 2002
- Adaptive suboptimum detection of an optical pulse-position-modulation signal with a detection matrix and centroid trackingJournal of the Optical Society of America A, 1998
- Multiple scattering of optical pulses in scale model cloudsApplied Optics, 1983
- Temporal and angular spreading of blue-green pulses in cloudsApplied Optics, 1982
- Backward Monte Carlo Calculations of the Polarization Characteristics of the Radiation Emerging from Spherical-Shell AtmospheresApplied Optics, 1972
- Radiative Transfer in Water and Ice Clouds in the Visible and Infrared RegionApplied Optics, 1971
- Influence of Single Scattering Albedo on Reflected and Transmitted Light from CloudsApplied Optics, 1968