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/cm(2), a bandwidth of (11 +/- 1) GHz, a responsivity of (0.30 +/- 0.03) A/W, and polarization sensitivity <=(1.0 +/- 0.5) 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.