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A wafer-level testable silicon-on-insulator-basecl microring modulator is demonstrated with high modulation speed,to which the grating couplers are integrated as the fiber-to-chip interfaces.Cost-efficient fabrications are realized with the help of optical structure and etching depth designs.Grating couplers and waveguides are patteed and etched together with the same slab thickness.Finally we obtain a 3-dB coupling bandwidth of about 6Onto and 10 Gb/s nonretu-to-zero modulation by wafer-level optical and electrical measurements.