Parallel-fed traveling wave photodetector for > 100-GHz applications

A fully packaged traveling wave photodetector (TWPD) with monolithically integrated optical power splitter for highspeed high-power applications in excess of 100 GHz is demonstrated. The detector module provides a responsivity of 0.24 A/W with a polarization dependence of only 0.2 dB at 1.55 mu m wavelength and is suitable for the detection of RZ data rates in excess of 80 G bit/s with unsaturated peak voltages of > 0.5 V. Chip-based measurements show a broadband impedance match, a 3 dB bandwidth of 80 GHz and a maximum electrical output power of - 2.5 dBm at 150 GHz.