Silicon's advanced fabrication processes have enabled the miniaturization of complex electronic systems, enhancing performance and efficiency. Recent technological developments have further expanded silicon's utility to integrate photonic systems, merging electronic and photonic technologies on a single chip. This integration has opened new avenues for high-speed communication and computation, attracting significant interest from both research and industry. In this thesis, integrated electronic-photonic solutions ranging from quantum control systems to optical transmitters are presented. Firstly, an integrated reconfigurable quantum control system is demonstrated. This system is used to determine electron-spin resonance frequency and perform Rabi, Ramsey, and Hahn-echo measurements for an NV center spin qubit in diamond. Secondly, two monolithically integrated single-channel optical PAM-4 transmitters are implemented, studied, and compared. Lastly, monolithically integrated 8- and 32-channel wavelength-division multiplexed optical transmitter systems are presented. These systems operate in the infrared optical C-band using custom-designed two-section PN-capacitive micro-ring modulators. The 8- and 32-channel systems support aggregate data rates up to 256 Gb/s and 1.024 Tb/s, respectively, and are highly integrated with a wavelength stabilization circuit, test data generators, and high-swing electrical drivers on the same CMOS silicon-on-insulator chip.