BiDi modules are transceivers that can send and receive at the same time over one fiber cable using two wavelengths. This full-duplex allows both directions without requiring a separate fiber for receiving. In practical network deployments, this makes BiDi SFP modules a highly effective solution for. A BiDi (Bidirectional) optical module adopts WDM (Wavelength Division Multiplexing) bidirectional transmission technology, enabling simultaneous bidirectional transmission within an optical channel over a single optical fiber.