On-chip Optical Interconnects - University of Rochester

Semiconductor Optical Single-Photon Diode Jie Zhang Department of Electrical and Computer Engineering Outline Introduction Avalanche Effect APD vs. SPAD Qenching Circuit

Conclusion PMT vs. APD Photomutiplier Tube High amplification Slow Fragile Bulky EM field susceptible Relatively expensiv

e Avalanche photodiode Similar amplification Fast Rugged Small Not susceptible Cheap

Structure Avalanche Effect APD SPAD comparison APD SPAD Below BD

Above BD MODE : linear Geiger GAIN :

e-/ph infinite AMPLIFIER TRIGGER BIAS :

How to observe faint and fast photon sources with the highest QE? Qenching circuit VA h R1 Vout(t)

R2 Active Qenching circuit Compact modules in the 90s Earlier modules

in the 80s Integrated AQC today Conclusion APDs operated at geiger mode toget her with a quenching circuit can be u sed as single photon detectors parti cular in the red and near IR spectral r

ange. This photon counting techniques pro vide the ultimate sensitivity and acc uracy in measurements of weak and/ or fast optical signals. The end Thank you!