Agarwal, Gordon A. Keeler, Christof Debaes, Bianca E. Nelson, Noah C.
Helman, and David A. B. Miller, "Latency Reduction in Optical
Interconnects Using Short Optical Pulses," IEEE J. Sel. Top. Quantum
Electron. 9, 410-418 (2003)
We present a new method of latency
reduction in optical interconnects: using very low duty cycle
return-to-zero encoding (i.e., subpicosecond pulses). An analytical
comparison of three different receiver architectures, including
transimpedance, integrating, and totem-pole diode pair, is presented.
For all three receivers, we demonstrated that using short pulses
instead of nonreturn-to-zero (NRZ) shortens the circuit delay. We also
experimentally demonstrate a ~65% reduction in latency of a
transimpedance receiver by using short optical pulses. Finally, we
show that the latency of optical interconnects can be comparable to or
even less than electrical interconnects for global on-chip
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