Fig. 1. (Color online) Architecture of the microring modulator.

Fig. 2. (Color online) (a) A photograph of the microring modulator with a scale bar of 200 μm . (b) A photograph of the chip coupled to the fiber array and probes for experimental test.

Fig. 3. The I–V curve of the active resonator when the 50 Ω resistance is disconnected.

Fig. 4. (Color online) (a) The transmission spectra of the microring modulator under four injection currents applied to the SOA. (b) Modulation depth and insertion loss with currents from 136.74 to 138.24 mA.

Fig. 5. (Color online) The experiment schematic of the modulation bandwidth measurement.

Fig. 6. The bandwidth of the device when it works as an electro–optic modulator.

Fig. 7. (Color online) Measured eye diagrams of the device under 4, 8, and 12 Gb/s bit rates.