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Integrating-sphere diffuser for wireless infrared communication

: Pohl, V.; Jungnickel, V.; Helmolt, C. von


IEE Proceedings. Optoelectronics 147 (2000), Nr.4, S.281-285
ISSN: 1350-2433
Fraunhofer HHI ()
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

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.