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Silicon is increasingly considered as the next future platform for photonic integrated circuits. Low loss Si waveguides and in particular the microring resonator approach seems to be very promising toward the realization of ultra compact, low cost, multi-functionality integrated devices. A novel solution to achieve hit-less tunable add and drop filter on SOI platform is reported on. The device architecture, designed for metro core/access networks, provides full C-band tunability, hit-less tuning operation, polarization independence and very low power consumption.