One pair of 10 Gigabit optical modules

Yes, 10 Gigabit bidirectional (BIDI) optical modules are used in pairs, with complementary wavelengths at each end of the fiber link.Bidirectional Operation10G BIDI SFP+ modules allow data transmission and reception over a single fiber strand by using wavelength division multiplexing (WDM) technology. Each module transmits on one wavelength and receives on another, so a complementary module is required at the other end of the fiber to complete the bidirectional link. For example, one module may transmit at 1270 nm and receive at 1330 nm, while its pair transmits at 1330 nm and receives at 1270 nm . Without the paired module, the link will not function.Advantages of Using PairsFiber Efficiency: Only one fiber is needed instead of two, effectively doubling the utilization of existing fiber infrastructure .Cost Savings: Reduces cabling and installation costs, especially in long-distance deployments .Deployment Flexibility: Ideal for data centers or networks with limited fiber availability .Standard 10G SFP+ ModulesTraditional 10G SFP+ modules, such as 10GBASE-SR (short-range) or 10GBASE-LR (long-range), typically use duplex fiber, requiring two fibers—one for transmitting and one for receiving. These modules do not require wavelength pairing but need proper TX/RX alignment . In contrast, BIDI modules specifically require paired operation due to their single-fiber bidirectional design .SummaryStandard duplex 10G SFP+ modules: Use two fibers, no pairing required.10G BIDI SFP+ modules: Use a single fiber, must be used in matched pairs with complementary wavelengths for bidirectional communication . Using the correct pair ensures reliable 10 Gigabit Ethernet connectivity while maximizing fiber efficiency and reducing infrastructure costs.