Unlike traditional dual-fiber communication systems that require separate fibers for transmitting and receiving data, BiDi Fiber enables bidirectional communication over a single optical fiber by using different wavelengths in opposite directions. By using Wavelength Division Multiplexing (WDM), BiDi SFP modules transmit and receive data on two different wavelengths, cutting. Bidirectional (BiDi) Small Form-factor Pluggable transceivers utilize internal WDM diplexers to transmit and receive optical signals over a single strand of fiber using asymmetric wavelengths. This approach effectively doubles the capacity of existing fiber installations while.