Lightwin 1.25 Gbit SFP BiDi Transceiver, 1550nm TX / 1310nm RX, 40 km, DDM, LC-Simplex, Singlemode, DFB (LWO-SFP-5531-40)

Where standard SFPs require two fibers, the Lightwin LWO-SFP-5531-40 collapses bidirectional Gigabit Ethernet onto a single strand of singlemode fiber. This BiDi module transmits at 1550 nm and receives at 1310 nm, enabling full-duplex 1.25 Gbps over distances up to 40 km. The DFB laser and integrated DDM provide stable long-haul performance with real-time diagnostics, making it a practical choice for carrier access, campus backbones, and metro edge links.

Highlights

• BiDi technology: single-fiber operation halves fiber infrastructure costs
• 1550 nm TX / 1310 nm RX wavelength pair, compliant with 1000BASE-BX40-U
• 40 km reach on 9/125 µm singlemode fiber with LC-Simplex connector
• Digital Diagnostic Monitoring (DDM) for live optical power, temperature, and voltage
• Hot-pluggable SFP MSA form factor, powered from 3.3 V

In daily use

Install the LWO-SFP-5531-40 in any SFP port and connect a single LC-terminated singlemode fiber. No configuration is required; the module negotiates Gigabit Ethernet automatically and begins passing traffic. DDM values are readable through the host switch or router, allowing proactive maintenance before link degradation. The commercial temperature range (0 °C to 70 °C) suits climate-controlled facilities and outdoor cabinets with basic environmental control.

Full specifications

• Form factor: SFP (Small Form-Factor Pluggable)
• Transceiver type: BiDi (Bi-Directional)
• Data rate: 1.25 Gbps
• TX wavelength: 1550 nm
• RX wavelength: 1310 nm
• Maximum transfer distance: 40 km
• Fiber type: Singlemode Fiber (SMF), 9/125 µm
• Connector: LC-Simplex
• Laser: DFB (Distributed Feedback)
• DDM/DOM: Yes
• Hot-pluggable: Yes
• MSA compliant: SFP MSA
• Supply voltage: 3.3 V
• Application standard: IEEE 802.3z 1000BASE-BX40-U
• Protocol: Gigabit Ethernet
• Duplex system: Simplex (single fiber)
• Operating temperature: 0 °C to 70 °C

Final note

For operators looking to maximize existing fiber plant, the Lightwin LWO-SFP-5531-40 delivers 40 km reach on a single core with the visibility of DDM—without the cost of a second fiber.