Abstract

The slow-light effect in silicon lattice-shifted photonic crystal waveguide (LSPCW) Mach–Zehnder modulators allows compact phase shifters, while limiting the working spectrum $\mathrm{\Delta }\lambda$. We optimized the structural parameters of the LSPCW and extended $\mathrm{\Delta }\lambda$ to cover the full C-band in exchange for moderately decreasing the group index $n_g$. We obtained $\mathrm{\Delta }\lambda =42\mathrm{nm}$ with $n_g=8-9$ in a fabricated device and observed 25 Gbps eye opening in the 200 μm modulator in the full C-band.

© 2017 Optical Society of America

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