A New Ground-to-train Communication System
Using Free-space Optics Technology
Author(s)
H. Kotake, T. Matsuzawa, A. Shimura, S. Haruyama
& M. Nakagawa
Abstract
We propose a new ground-to-train communication system using free-space
optics between a train and the ground. In the proposed system, a cylindrical
concave lens spreads the incoming beam from transmitter (Laser Diode, LD)
horizontally to form a wide fan-shaped beam. The fan-shaped beam is projected
to a train and the width of the projected beam is equal to the length of a typical
bullet-train car. This transmitter with cylindrical concave lens and a receiver
(Avalanche Photo Diode, APD) are installed on a train and the ground, and the
horizontally spread beam is received continuously by the corresponding receiver.
The train can keep a communication link continuously to the ground thanks to
this spread beam. We analyzed the performance of the proposed system by
experiments. The experimental results show that a sufficient received Signal-to-
Noise Ratio (SNR) can be obtained when a train is not moving; therefore, the
signal can be received continuously even when the train is moving. Furthermore,
in order to keep a continuous communication link even when the train vibrates or
shifts vertically, the vertical spread angle of a laser beam is adjusted between 0.1
degrees and 0.5 degrees. These experimental results lead to the conclusion that
this system is expected to be a Giga-bit class high speed communication
technology between the train and the ground.
Keywords: train communication, optical wireless communication, visible light
communication, horizontally spread beam.
1 Introduction
In recent years, the environment of the ubiquitous society is being developed by
rapid expansion of high-speed communication infrastructure such as Asymmetric
Keywords
train communication, optical wireless communication, visible lightcommunication, horizontally spread beam.
Related Book
Other papers in this volume
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