ELECTRICAL-POWER CONSUMPTION OF THE EMITTER FOR A NON-GUIDED OPTOELECTRONIC LINK

The aim of this paper is to determine the best value of the signal-to- noise ratio (SNR) for a non-guided optoelectronic link with minimum el ectrical power consumption by the emitter. Transmitter structures have been analysed and optimized as a function of the bit error rate {BER} of the link in order to give either the highest autonomy or a lower n umber of emitter components. The application requirement for the trans mitter is consequently to offer a flexible and secure communication so lution. The transmitter provides non-guided infrared communication ins ide a limited cell size. The thermal effects, the rise and fall times of the optical power output of the emission and the characteristics of component devices have been taken into consideration in order to eval uate the SNR. We demonstrate that, for a given electrical consumption, the emitted optical power of the transmitter circuit increases with t he logarithm of the total number of light emitting diodes.