In data communication (Datacom) systems, microlens arrays serve multiple purposes. They enable fiber collimation, which involves shaping and controlling the direction of light beams emitted from fiber optic cables. Microlens arrays help to turn diverging light into parallel beams, which improves the efficiency of light transmission and reduces signal loss. Additionally, microlens arrays can be used for fiber coupling, which allows for efficient light transfer between optical fibers and other components. Using a microlens array enables precise focusing and coupling of light into another fiber, which optimizes signal transfer and minimizes losses. Finally, microlens arrays can be used for wavelength switching in Datacom systems. By incorporating microlens arrays with different focal lengths, it is possible to selectively switch and route light of different wavelengths. This enables wavelength division multiplexing (WDM) and allows for the simultaneous transmission of multiple data channels over a single fiber, increasing the data capacity of the system.