Demonstration of 16-wavelength 10Gb/s Optical Wireless Transmission
Date Issued
2008
Date
2008
Author(s)
Chen, Pei-Lin
Abstract
In the point-to-point application of urban networks, the advantage of optical wireless (OW) communication system is the high transmission capacity and the low equipment expense, which provides an ideal solution for the last mile problem. Because the propagation of light is directional, the high communication quality can be achieved if there are no obstacles between the transmitter and the receiver (line of sight). Therefore the main factor for transmitting light in the atmospheric is: absorption, scattering and turbulence caused by the suspended particles and molecules. Power attenuation per kilometer reaches as high as above 100dB especially when the thick fog occurs. The scattering effects can be assorted as three categories: Rayleigh scattering, Mie scattering and geometry scattering. Various effects can be applied in different range of wavelength. For example, at the wavelength of , if the radius of particles is similar to the wavelength, Mie theory is suitable for analyzing the scattering effect. Mie theory which provides mathematical analysis about the scattering angle and the intensity, it can be used to estimate attenuation caused by atmosphere and scattering intensity in different conditions.he thesis consists of two major parts. One is to analyze attenuation by Mie theory; the other part introduces a 16-channel OW system with channel rate of 10Gb/s and measures the bit error probability. When transmission distance is within a few hundred meters, the attenuation is small. Therefore the performance of the system is quite superior. Increasing transmitting distance above one kilometer, the attenuation is significant. In actual experiment, we demonstrate an OW transmission with 2.16 kilometers. The thesis discusses the influence caused by scattering from the theory and experimental data. We can understand the major challenge in the OW communication is fog in the thesis. But OW can provide high data rate and low hardware cost at the same time, we believe that OW communication is a high potential technology.
Subjects
free space optics
optical communication
optical wireless
wavelength division multiplexing
wireless communication
Type
thesis
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