Types of 10 Gigabit Single-Fiber Bidirectional Optical Modules

A 10G BiDi SFP+ module transmits and receives 10 Gigabit Ethernet over a single fiber using two wavelengths, typically with distances up to 60 km depending on the model.Key SpecificationsTransmission and Reception: BiDi modules use bidirectional communication over a single fiber strand, employing two different wavelengths—one for transmitting (Tx) and one for receiving (Rx). For example, a common configuration is Tx at 1270 nm and Rx at 1330 nm, with the opposite module using the reverse pairing to complete the link . Data Rate: Supports 10 Gbps Ethernet over single-mode fiber . Distance: Typical modules support distances of 10 km, 20 km, 40 km, and up to 60 km, depending on the specific model and fiber quality . Laser Type: Uses Distributed Feedback (DFB) lasers, which provide stable wavelength output and high performance over long distances . Power Levels:Transmit power (Tx): ranges from -1 dBm to 5 dBm depending on the module and distance.Receiver sensitivity (Rx): typically ≤ -14.4 dBm to ≤ -20 dBm, ensuring reliable detection of incoming signals . Connector Type: Simplex LC UPC connector is standard, allowing single-fiber deployment and reducing cabling complexity compared to duplex SFP+ modules . Module Pairing: BiDi modules must be deployed in matched pairs with complementary wavelengths (e.g., SFP-10G-BXD1 with SFP-10G-BXU1) to ensure proper bidirectional communication . Fiber Savings and Deployment Benefits:Reduces fiber usage by up to 50% compared to traditional duplex SFP+ modules.Simplifies cabling and management in fiber-constrained environments.Cost-effective for data centers, metro networks, and enterprise backbones . Compatibility Considerations: Ensure that the BiDi module is compatible with the fiber type (single-mode) and that the paired module uses the correct complementary wavelength. Mismatched modules can significantly reduce transmission distance or fail to establish a link .Summary10G BiDi SFP+ modules are ideal for high-speed, single-fiber deployments, offering 10 Gbps throughput, long-distance reach, and efficient fiber utilization. Key parameters include wavelengths (Tx/Rx), DFB laser type, transmit/receive power, LC connector type, and mandatory paired deployment. These modules are widely used in data centers, enterprise networks, and metro fiber links where fiber availability is limited or cost-sensitive.