Energy-Efficient Photonics: Computing Applications and Fundamental Limits
Academic papers have routinely reported power per bit numbers in the low pJs for several years. It may be reasonable to assume as an upper limit that deployed systems may achieve the one to two orders of magnitude improvement to reach 0.5 pJ/bit within the next 5 years. These optimistic electrical link estimates still fall short of energy performance required by advanced microprocessors. Here we demonstrate that the current state of photonic devices integrated in foundry CMOS foundry processes are competitive with existing and next generation on-chip power dissipation numb