PID controlled thermal management in photonic network-on-chip

The communication bandwidth and power consumption of network-on-chip (NoC) are going to meet their limits soon because of traditional metallic interconnects. Photonic NoC (PNoC) is emerging as a promising alternative to address these bottlenecks. However, PNoCs are highly susceptible to thermal fluctuations which is highly common in a manycore chip. This paper first introduces a low power, low cost mesh-based PNoC architecture and provides a quantitative analysis of it's power consumption over varying on-chip temperature. The paper then proposes a proportional-integral-derivative (PID) heater mechanism that minimizes the effect of thermal variation on PNoC's performance and power. Experimental results for a 8 × 8 PNoC shows that the proposed technique offers the maximum network-bandwidth considering the thermal effects. Compared to the recently reported results, the proposed design consumes 40% less power and has a temperature variation as low as 1 °C.