Single-mode single-fiber transceiver ab

A single-mode single-fiber (AB) transceiver is a bi-directional SFP module designed for 1G transmission over a single strand of single-mode fiber, supporting distances up to 2 km.OverviewSingle-mode single-fiber transceivers, often referred to as bi-directional (BIDI) SFP modules, allow data transmission and reception over a single strand of 9/125 µm single-mode fiber (SMF). This reduces fiber cabling requirements and is ideal for retrofitting existing fiber infrastructure or extending networks where only one fiber is available . The AB designation typically refers to a kit containing complementary A and B modules, each transmitting and receiving on different wavelengths to enable full-duplex communication over a single fiber .Key SpecificationsData Rate: Up to 1.25 Gbps for standard AB SFP modules .Distance: Supports up to 2 km over single-mode fiber .Connector Type: Simplex LC connector interface .Compliance: Conforms to SFP Multi-Source Agreement (MSA), Class 1 FDA and IEC60825-1 laser safety standards .Operating Temperature: 0°C to 70°C (32°F to 158°F), with storage from -40°C to 85°C (-40°F to 185°F), .Applications: Suitable for industrial networks, telecom, FTTH installations, and enterprise networks requiring single-fiber solutions .AdvantagesFiber Efficiency: Uses a single fiber for bidirectional communication, reducing cabling costs.Hot-Pluggable: Can be installed or replaced without powering down the network equipment .Compatibility: Works with standard SFP ports and is interoperable with most network switches and fiber optic equipment .Scalability: Available in various form factors (SFP, SFP+, QSFP) for higher speeds and longer distances .ConsiderationsDistance Limitations: Standard AB SFP modules are typically limited to 2 km; longer distances require higher-power or extended-range SFPs .Wavelength Matching: Ensure the A and B modules are paired correctly, as each transmits on a different wavelength (commonly 1310 nm and 1550 nm) to avoid signal interference .Network Design: Ideal for point-to-point links; for complex topologies, additional planning may be required.Example ProductThe Altronix P1AB2K kit includes one P1A2K and one P1B2K module, providing a complete AB pair for 1G transmission over a single strand of SMF up to 2 km. It is hot-pluggable, MSA-compliant, and suitable for both new installations and retrofits . In summary, single-mode single-fiber AB transceivers are efficient, cost-effective solutions for extending fiber networks using minimal cabling while maintaining high-speed, reliable communication. They are widely used in industrial, enterprise, and telecom applications where fiber availability is limited.