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2000
Journal Article
Title
Integrating-sphere diffuser for wireless infrared communication
Abstract
The application of an integrating sphere (IS) as a diffuser in a wireless infrared (IR) network is investigated. Going beyond the simplified analytical model, it is shown that ray-tracing simulations provide realistic data for the optical insertion loss: the transfer function and the far-field light distribution. As an example, a sphere diffuser for a 155 Mbit/s 16-PPM IR transmitter is investigated with an insertion loss of 0.66 dB, a cutoff frequency of 570 MHz and a 104 degrees full width at half-maximum (FWHM) angle of the intensity distribution. The device has also been manufactured using a proprietary material and good agreement between simulation and experimental data is found. A method to increase the FWHM angle and some aspects of eye safety are discussed.
Keyword(s)
optical communication
optical losses
optical transmitters
photometry
ray tracing
safety
integrating-sphere diffuser
wireless infrared communication
wireless ir network
ray-tracing simulations
optical insertion loss
transfer function
far-field light distribution
sphere diffuser
ir transmitter
insertion loss
half-maximum angle
intensity distribution
fwhm angle
eye safety