Top-illuminated InAlAs based Avalanche Photodiode for 106 Gb/s PAM4 Application

A novel Top-illuminated APD is demonstrated for 106 Gb/s PAM4 Application. With a
$16\ \mu\mathrm{m}$
window diameter, we achieve 31 GHz bandwidths, 1.6A/W responsivity, and maximum output RF saturation power under 11mA photocurrent at 0.9V
br
.