Fig. 1. (Color online) (Color online) Proposed four-channel CWDM transmitter on the TFLN platform. 3D view of (a) whole structure and (b) CWDM device based on the AMMI structure. (c) Cross-sectional view of the modulation section. (d) Top view of the CLTW electrode.

Fig. 2. Optical images of (a) whole transmitter and (b) four-channel CWDM device. Scanning electron microscope images of (c) cross-sectional view and (d) top view of the modulation section.

Fig. 3. (Color online) (a) Measured and simulated transmission spectral responses of the fabricated CWDM device. (b) Measured transmission spectral responses of the four input GCs and the common output GC.

Fig. 4. (Color online) Normalized optical transmission of the fabricated four modulators as a function of the applied voltage for (a) Ch. 1 and Ch. 2, and (b) Ch. 3 and Ch. 4.

Fig. 5. (Color online) Measured EE (a) transmissionsS₁₂ and (b) reflectionsS₁₁ for the four modulators.

Fig. 6. (Color online) Measured EE crosstalk characteristics of the fabricated CWDM transmitter for (a) Ch. 1, (b) Ch. 2, (c) Ch. 3, and (d) Ch. 4.

Fig. 7. (Color online) Measured and simulated EO responses for the four modulators.

Fig. 8. (Color online) (a) Experimental setup for high-speed data transmission measurements. PC: polarization controller. Measured optical eye diagrams for the OOK format at a data rate of 64 Gb/s for (b) Ch. 1, (c) Ch. 2, (d) Ch. 3, and (e) Ch. 4.

Fig. 9. (Color online) Measured optical eye diagrams for the PAM-4 format at a data rate of 100 Gb/s for (a) Ch. 1, (b) Ch. 2, (c) Ch. 3, and (d) Ch. 4.