Fig. 1. (Color online) Diagrammatic sketch of the module.

Fig. 2. (Color online) Diagrammatic sketch of the laser chip unit.

Fig. 3. (Color online) Sketch of the modulator chip unit.

Fig. 4. (Color online) Optical path of the module.

Fig. 5. (Color online) Simulation results of normalized optical output efficiency of the module vs. (a) rotated angle of the fiber, (b) optical axis offset distance of the lens, (c) optical axis offset distance of the fiber to the cocenter optical axis, and (d) the MFD of the modulator waveguide.

Fig. 6. (Color online) (a) MZ-modulator waveguide structure. (b) Simulation results of extinction ratio (on/off) and split ratio variation vs. normalization angle. (c) Simulation results of extinction ratio (on/off) and coupling ratio vs. two arms distance.

Fig. 7. Simulation results of the electro-optic response of the module.

Fig. 8. (Color online) Hybrid integrated optical transmitter module.

Fig. 9. P–I curve of the DFB laser chip.

Fig. 10. (a) EO bandwidth and (b) ER test results of the LiNbO₃ modulator chip.

Fig. 11. (a) EO bandwidth and (b) ER test results of the module.

Fig. 12. (Color online) Output RF power of a linear tone and of a third-order intermodulation vs. the RF input power.

Table 1. Test results of the optical output efficiency.