HELIOS: A High Energy-efficiency Locally-scheduled Input-queued Optical Switch

Fast growing traffic for both the Internet and within data centers has lead to an increasing demand for high-speed switching systems. In this paper, we propose a fully distributed scheduling algorithm with an O(1) complexity, for a switch with an optical switching fabric. The inputs only use local queue information to make their scheduling decisions, and the switch consumes much less power than an electronic switch. Therefore, we call the switch HELIOS: High Energy-efficiency Locally-scheduled Input-queued Optical Switch. HELIOS can achieve 100% throughput for any admissible Bernoulli i.i.d traffic. To our knowledge, this is the first distributed scheduling algorithm to guarantee 100% throughput for an input-queued optical switch.