Fig. 1. Structure of the integrated PSIC system and schematic spectra illustrating phase modulation and sideband filtering. PM, phase modulator; VOA, variable optical attenuator; TODL, tunable optical delay line; WDM, wavelength division multiplexer; OF, optical filter; PD, photodetector.

Fig. 2. (a) Optical microscope image of the integrated PSIC chip. (b) Cross-sectional schematic view (not to scale) of the silicon-on-insulator platform. (c) Packaged PSIC module. AGC, array grating coupler; TEC, thermo-electric cooler; FA, fiber array.

Fig. 3. Measured results of VOA. (a) Variation curve of output optical power with applied DC power. (b) Measured optical spectrum of different applied powers over 2.54 nm bandwidth.

Fig. 4. Measured optical spectrum of TODL. (a) Intensity response under different regulation states. (b) Zoom-in view of (a) around 1550 nm. (c) Group delay response corresponding to different regulation states in (b).

Fig. 5. Transmission spectra of the WDM. (a) Simulated result. (b) Measured intensity response with different applied powers.

Fig. 6. Measured intensity and phase response of the OF.

Fig. 7. Measured O/E conversion response of the PD.

Fig. 8. Experiment setup to demonstrate the feasibility of the PSIC module for IBFD communication.

Fig. 9. Optical spectrum of phase-modulated signals by sideband filtering.

Fig. 10. S21 amplitude response of interference branch and reference branch.

Fig. 11. Cancellation depth characterization in C, X, Ku, and K bands.

Fig. 12. Measured amplitude and phase differences between reference and interference branches. (a) fRF=12.4  GHz; (b) fRF=14.2  GHz.

Fig. 13. Output RF spectra in bandwidth of 100 MHz with and without cancellation and constellation diagram of SOI in bandwidth of 50 Msps. (a) fRF=12.4  GHz; (b) fRF=14.2  GHz.

Fig. 14. Measured EVM of the recovered SOI with different powers of interference signal. (a) fRF=12.4  GHz; (b) fRF=14.2  GHz.

Fig. 15. Measured EVM of SOI after PSIC system with different input powers. (a) fRF=12.4  GHz; (b) fRF=14.2  GHz.

Fig. 16. Measured SFDR of the PSIC system without interference and with cancellation. (a) fRF=12.4  GHz; (b) fRF=14.2  GHz.