Slow-light Mach–Zehnder modulators on a silicon-on-insulator substrate are examined in this paper. The phase shifter on each arm consists of ten cascaded ring resonators in an all-pass filter configuration, and this acts as a slow-light structure. Fabricated devices show seven-fold enhancement in modulation efficiency compared with that of a conventional modulator; this enhancement was due to the slow light. Large signal modulations of 10 Gbps have been obtained using a driving signal of only 1 V peak-to-peak.
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Akiyama et al. (2010) studied this question.
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