Fast Silicon Photonics Wavelength-Selective Phase Shifter

A fast wavelength-selective phase shifter realized in silicon-on-insulator technology based on carrier-depletion effect in a microring resonator suitable for photonic processing of microwave signals is designed and experimentally verified. The proposed approach overcomes the bandwidth limitations of standard thermo-optic tuning while providing large spectral shift of the phase characteristic, minimized amplitude modulation, and low optical insertion loss by proper optimization of ring parameters. The results illustrate a maximum optical phase variation of 250° for a transmission change limited to within 4.5 dB, and large electro-optical bandwidth of 10 GHz