Fig. 2: Characterization of optical filtering responses.
From: Single-chip silicon photonic engine for analog optical and microwave signals processing
a The processing engine configuration for optical filtering. b Single bandpass filtering configuration and response. One upper ring is used, the phase shifter is set to 0; c Double bandpass filtering configuration and response. One upper ring and one lower ring are used; the phase shifter is set to 0; d Second-order Chebyshev Type II bandpass filtering configuration and response, one upper ring and one lower ring are used, phase shifter is set to π; e Fourth-order Chebyshev Type II bandpass filtering configuration and response. Four rings are used, phase shifter is set to π.
