Zero-Bias Operational Ultra-Broadband UTC-PD above 110 GHz for High Symbol Rate PD-Array in High-Density Photonic Integration

We have successfully developed a zero-bias operational ultra-broadband uni-traveling-carrier photodiode (UTC-PD) with a frequency bandwidth above 110 GHz using a low carrier concentration of 3 × 1014 cm−3 in the carrier collection layer.