Ultracompact monolithic integration of balanced, polarization diversity photodetectors for coherent lightwave receivers

摘要

The authors have monolithically integrated an optical front-end on InP for balanced, polarization-diversity coherent lightwave reception which is only 1.3-mm long. Low on-chip insertion loss (>4.5 dB) and balanced photoresponse (1.05:1 or better) are achieved at 1.5- mu m wavelength using straightforward, regrowth-free fabrication. Low-capacitance photodetectors (>or=0.15 pF) are employed for high bandwidth operation.