Fig. 1. (a) Hybridly-integrated CWDM ROSA module configuration. (b) Photograph of the ROSA. (c) Partially detailed configuration of the ROSA.

Fig. 2. (a) Schematic of 3D microwave circuit. (b) Model of RF circuit board with high frequency transmission line.

Fig. 3. Simulation results of transmission performance of the RF circuit board.

Fig. 4. Simulation results of the electrical crosstalk between the adjacent channels.

Fig. 5. Small-signal equivalent circuit model for one channel of the module.

Fig. 6. Calculated frequency response with different values of Ls.

Fig. 7. Calculated frequency response with different values of C2.

Fig. 8. Measured and simulation frequency responses of (a) the PD chip and (b) the packaged module for one channel. The insets are their corresponding simulation and measurement eye diagrams.

Fig. 9. Flat-top spectral profile of four-lane ROSA module in CWDM (gray areas indicate CWDM grid).

Fig. 10. Measured responsivity of the packaged ROSA module. Inset is the photograph of the module with the detailed inner distribution.

Fig. 11. Measured transmission response and reflection response of the hybridly-integrated PD module at a bias voltage of 3 V.