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Integrating-sphere diffuser for wireless infrared communication

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3 Author(s)
Pohl, V. ; Heinrich-Hertz-Inst. fur Nachrichtentech. Berlin GmbH, Germany ; Jungnickel, V. ; von Helmolt, C.

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° 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

Published in:

Optoelectronics, IEE Proceedings -  (Volume:147 ,  Issue: 4 )