Zero-Bias High-Speed Evanescently Coupled Waveguide Type-II UTC Photodiode

We demonstrate GaAs
_0.5
Sb
_0.5
/In
_0.53
Al
_y
Ga
_0.47-y
As uni-traveling carrier (UTC) waveguide photodiodes with high bandwidth of up to 66 GHz at zero bias and over 100 GHz bandwidth under low bias condition.