Integrating sphere diffuser for wireless infrared communication

The application of an integrating sphere (IS) as a diffuser in a wireless infrared network is investigated. In order to obtain realistic data for the insertion loss, the transfer function and the far field light distribution, a random walk ray tracing model is used. As an example, a Spectralon(R) diffuser for a 155 Mbit/s 16-PPM IR transmitter is designed having a total efficiency of 86%, a cut-off frequency of 570 MHz and a nearly Lambertian intensity distribution. An additional target is used to create a more homogeneous far field without significant changes of the efficiency and the cut-off frequency