Bi-Directional (BiDi) Transceiver is a compact optical transceiver module that uses WDM (wavelength division multiplexing) technology and is compliant with the SFP multi-source agreement (MSA). Bi-Directional technology means a communication mode that processes data in both directions (send and receive) over optical fiber, which allows transceiver modules to transmit and receive data to/from the interconnected network devices (like network switches or routers) via a single optical fiber.