Integratable High Linearity and High Bandwidth Compact Tapered Photodetector

We demonstrate a compact, high linearity, tapered photodiode based on the asymmetric twin guide (ATG) architecture. The photodiode has a 1-dB compression current density >2.8 kA/cm², a bandwidth of (11plusmn1) GHz, a responsivity of (0.30plusmn0.03) A/W, and polarization sensitivity les(1.0plusmn0.5) dB. The tapered shape of the detector reduces space-charge induced nonlinearities at high current density. The linearity current density, to the best of our knowledge, is the highest reported for an integratable, edge-illuminated, polarization-insensitive p-i-n photodetector. The ATG architecture makes the device suitable for monolithic integration with active and passive optical elements such as amplifiers, lasers, modulators, arrayed waveguide gratings, and multimode interference couplers