High-speed performance of a TDFA-band micro-ring resonator modulator and detector

We demonstrate a silicon-on-insulator micro-ring resonator (MRR) modulator and defect-mediated (DM) detector operating at a wavelength near 2 µm for use in the thulium doped fiber amplifier wavelength band. The MRR modulator was critically coupled with an unbiased notch-depth of 20 dB and Q-factor of 4700. The resonance shift under reverse bias was 23 pm/V with a calculated V_πL_π of 2.2 to 2.6 V·cm from -1 to -8 V, respectively. Simulations are in good agreement with the measured data. The experimental modulation bandwidth was 12.5 GHz, limited by the response of the commercial external detector used for this measurement. The DM detector was operated in avalanche mode, had 1.97 µm wavelength responsivities of 0.04 and 0.14 A/W, and had bandwidths greater than 16 and 7.5 GHz at -15 and -30 V biases, respectively. Large-signal measurement demonstrated open eye-diagrams at 5, 10, and 12.5 Gbps for the DM detector and also for an optical link consisting of the modulator and detector integrated on the same silicon chip.