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In satellite-borne platforms where the reduction of size, weight and power are very critical design factors. To pursuing to this goal, we present a design for ultrawideband tightly coupled antenna array (TCDA) with wide angle scanning and low cross polarization. Although TCDAs possess the merit of wideband, wide-scanning performance, they need a balanced feeding structure which introduces several...
A grating coupler with aligned Si3N4 and Si grating teeth is proposed and demonstrated. The measured coupling efficiency is −1.3 dB (competitive with the best Si-only grating couplers), and the 1-dB bandwidth is a record 80 nm.
We report waveguide Ge/Si avalanche photodiodes with a high 3-dB bandwidth of ~20 GHz and a high responsivity of 22 A/W. Such device can be monolithically integrated with other silicon photonic components on SOI substrates.
We report a normal incident Ge/Si avalanche photodiode by selective epitaxial growth. By eliminating germanium impact-ionization at high gain, high responsivity of 12A/W and large gain-bandwidth product of 310GHz have been achieved at 1550nm.
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