Light-emitting diodes with 17% external quantum efficiency at 622Mb/s for high-bandwidth parallel short-distance optical interconnects

摘要

We report on nonresonant cavity light-emitting diodes (NRC-LED)nwith large quantum efficiencies and high speed. A maximum quantumnefficiency of 31% is measured for a device with an active layernthickness of 120 nm, and 18.7% for a device having an active layer of 30nnm. Further, we report on optical rise and fall times of NRC-LEDs. Evennwhen switched to current levels below 4 mA, at which the externalnquantum efficiency exceeds 17%, our NRC-LEDs have 10%-90% rise and fallntimes of less than 2 ns. As a result, eye diagrams taken at this currentnlevel at 622 Mb/s are wide open. This demonstrates the suitability ofnhigh-efficiency NRC-LEDs for optical interconnects. Finally, from ansystem's viewpoint it is important to note that the optical output powernof NRC-LEDs decreases by only 0.36%/°C