Lightwin 1.25 Gbit SFP BiDi Transceiver, 1310nm TX/1550nm RX, 40km, DDM, LC Simplex, Singlemode, DFB (LWO-SFP-3155-40)

Network engineers deploying long-distance gigabit links over a single strand of fiber will find the Lightwin LWO-SFP-3155-40 an essential component. This BiDi SFP transceiver uses 1310nm for transmit and 1550nm for receive, enabling full-duplex communication over one singlemode fiber core. With a reach of up to 40 kilometers and digital diagnostics monitoring, it is built for metropolitan area networks, campus backbones, and service provider access links where fiber is scarce and reliability is critical.

Key specifications

• Data rate: 1.25 Gbps (Gigabit Ethernet, 1G Fibre Channel)
• Wavelengths: 1310nm TX / 1550nm RX (BiDi, single-fiber operation)
• Maximum distance: 40 km on 9/125µm singlemode fiber
• Connector: LC simplex (single fiber)
• Laser type: DFB (Distributed Feedback)
• Digital Diagnostics Monitoring (DDM/DOM) for real-time monitoring
• Hot-pluggable SFP MSA compliant, 3.3V power supply
• Operating temperature: 0°C to 70°C (commercial grade)
• Compliance: IEEE 802.3z, 1000BASE-BX40-U

Why choose it

The Lightwin BiDi transceiver doubles the capacity of existing fiber infrastructure by transmitting and receiving on a single strand. This reduces cabling costs and simplifies installation in crowded ducts or long-haul routes. The integrated DDM allows network administrators to monitor optical power, temperature, and voltage remotely, enabling proactive maintenance and reducing downtime. The DFB laser ensures stable performance over the full 40 km distance, even under varying environmental conditions.

Ideal use cases

• Extending gigabit Ethernet connections between buildings or remote sites
• Upgrading legacy single-fiber links to higher bandwidth without new cabling
• Connecting access switches to aggregation nodes in campus or metro networks
• Deploying 1G Fibre Channel over long distances for storage area networks

Good to know

This transceiver is designed for use with singlemode fiber (SMF) with a core/cladding diameter of 9/125µm. It must be paired with a complementary BiDi transceiver on the opposite end: one using 1310nm TX/1550nm RX (this model) and the other using 1550nm TX/1310nm RX. The LC simplex connector ensures a secure, low-loss connection. The module is hot-pluggable, allowing for easy installation and replacement without powering down the network device.