Performance analysis of a hybrid optical-electronic packet switch supporting different service classes

As a solution to the high energy consumption caused by numerous optical-electrical-optical (O-E-O) conversions in electronic switches, and the poor contention handling of all-optical switches, we investigated a hybrid switch that supplements optical switching with an electronic buffer. Our study takes into account reliable, fast, and default packets that have different requirements of quality-of-service performance criteria. We show, by simulations, that with only a few electronic ports to the buffer, the hybrid switch significantly improves the packet loss rates and the sustainable system load compared to an all-optical bufferless switch and meets the different packet classes´ requirements. In addition, we quantified the considerable decrease of O-E-O conversions as well as the switching latency achieved by the hybrid switch compared to an electronic switch.