Abstract
A high-speed ring-assisted Mach–Zehnder interferometer (RAMZI) silicon modulator
is reported and experimentally demonstrated. The RAMZI optical structure relaxes the
optimum coupling condition of the ring without degrading the modulator performance,
which therefore improves the modulator robustness against fabrication deviations and
could eventually lead to an enhanced modulation bandwidth. Hence, our RAMZI silicon
modulator, based on carrier depletion in a <i>pipin</i> active structure, exhibits a 3 dB
electro-optical bandwidth of 19 GHz, enabling up to 20 Gbit/s data transmission over a
RF/optical interaction length of only ~200 μm.
© 2011 IEEE
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