Abstract
Before we can address such issues as electrical receiver design and modulation design, we need a solid understanding of the optical components that underlie a wireless infrared communication system. The purpose of this chapter is to present a link budget analysis for non-directed line-of-sight optical communications, and to present design strategies for optimizing the transmitter and receiver optical components. We examine the signal-to-noise ratio (SNR) improvement of a hemispherical concentrator as an optical antenna. We propose a hemispherical thin-film optical filter, and compare its performance to that of a traditional planar thin-film filter. For both filter types, we jointly optimize the transmitter radiation pattern, the filter orientation, and the filter bandwidth. The results of this chapter indicate that a 269-mW transmitter and a 1-cm2photodetector are sufficient to achieve a 100-Mb/s non-directed link over a range of 4 m, even in the presence of intense background light. These numerical results are based on a sphere radius of 2 cm; in principle, an arbitrary performance improvement can be achieved by an arbitrarily large sphere radius, implying a direct trade-off between performance and size.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 1994 Springer Science+Business Media New York
About this chapter
Cite this chapter
Barry, J.R. (1994). Link Analysis and Optics Design. In: Wireless Infrared Communications. The Springer International Series in Engineering and Computer Science, vol 280. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2700-8_2
Download citation
DOI: https://doi.org/10.1007/978-1-4615-2700-8_2
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-6162-6
Online ISBN: 978-1-4615-2700-8
eBook Packages: Springer Book Archive