The PCB of photonic modules is a key component for achieving photoelectric conversion, playing a crucial role in communication systems. The board itself is an active component in the system, and its design dictates the success or failure of. Definition: An Optical Module PCB is the internal circuit board of a transceiver (like SFP, QSFP, or OSFP) responsible for converting electrical signals to optical signals and vice versa. ROSA (Receiver Optical Sub-Assembly):. Optical module PCBs are essential for improving communication and data transmission speeds in many different industries, including telecommunications, data centers, and high-speed networks. They make long-distance optical signal transmission and reception easier, which speeds up and improves.