To design a silicon PIN cavity for ns-tunable lasers, the thermo-optic effect associated with electro-optic tuning is investigated and observed in the relationship of ∆neff and voltage. The thermo-optic effect in PIN waveguide will degrade the performance of the external cavity. We propose optimization strategy to avoid such effect and verified by experiment. Finally, we measured the switching speed of tunable micro-ring within 5ns.
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