Silicon nitride-on-SOI grating couplers are specifically designed for the O- and C-bands, utilizing CUMEC's advanced process platform. Through simulation, we have achieved an impressive maximum coupling efficiency of -1.4 dB and -1.8 dB to standard single-mode fiber for the O- and C-bands respectively, accompanied by a remarkable 1-dB bandwidth of 70 nm and 78 nm. Furthermore, we have conducted an analysis on fabrication variation tolerance.
We report high-performance waveguide-integrated germanium photodetectors. The responsivity above 0.95A/W and dark current of 2.9nA were demonstrated with the bias voltage of -1V and input optical wavelength of 1310nm. The 3-dB bandwidth above 67GHz demonstrated due to radio-frequency (RF) resonance effect. The RF resonance is explained by the transfer function of parasitic circuit based on the equivalent circuit model of photodetector. In addition, clear open eye diagrams at 50Gb/s are also shown.
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