We demonstrate 50 Gbps operation of a compact Si photonic crystal optical modulator, employing meanderline electrodes which compensate phase mismatch between slow light and RF signals. Although low dispersion slow light increases the modulation efficiency, the phase mismatch becomes a limiting factor of the operation speed. The meanderline electrodes and termination resistors broke this limit and enhanced the cut-off frequency up to 31 GHz. The quality of the modulation characteristics was improved at 25, 32 Gbps, and a clear eye opening even observed at 40–50 Gbps.
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