100G QSFP28 ER1 BiDi 40km LC Optical Transceiver

The 100G QSFP28 ER1 BiDi optical transceiver is designed for 100G transmission up to 40km over a single strand of single-mode fiber. Instead of using separate fibers for transmit and receive, the BiDi link assigns different wavelengths to each direction through a simplex LC connection. The green-latch configuration transmits at 1305nm and receives at 1309nm, while the opposite end of the link requires the complementary 1309nm transmit / 1305nm receive module. For telecom, metro and network expansion projects, this paired wavelength relationship is the first item that should be confirmed before the module is approved for purchasing.

That requirement makes this product different from a conventional duplex-fiber 100G module. When reviewing the 100G optical transceiver range, buyers should confirm not only the 40km reach and QSFP28 host port, but also which wavelength member is required at each end of the fiber. Ordering the same BiDi wavelength configuration for both ends would not create a working optical pair. Host compatibility or coding requirements should therefore be matched with the A/B wavelength assignment before a batch order is released.

For project quantities, the purchase specification should make the paired configuration easy to check from quotation through receiving. The order can identify how many 1305/1309nm and 1309/1305nm modules are required, together with compatibility coding, labeling, packaging and documentation requirements. Payment and delivery conditions should be confirmed with the commercial order. When the shipment arrives, the receiving team should check the model labels, wavelength direction, latch identification, quantity and agreed coding against the approved pairing plan before the modules are sent for installation.

100G QSFP28 ER1 BiDi Specifications

The specifications below focus on the single-fiber wavelength pairing, optical reach and operating conditions that are most important when approving this module for a 40km BiDi link.

For bulk sourcing, wavelength pairing should remain part of the approved order specification rather than being treated as a warehouse detail after delivery. The number of modules required for each direction, host compatibility and labeling should be confirmed before the PO is finalized, then checked again during incoming inspection. This helps prevent a shipment containing the correct 100G BiDi product family but the wrong A/B wavelength balance for the actual network links.