Lightwin 1,25 Gbit SFP BIDI transceiver, 1550nmTX/1310nmRX, 20km, DDM, LC Simplex, Singlemode (LWO-SFP-5531-20)

With a 20 km reach over a single strand of singlemode fibre, this Lightwin SFP transceiver delivers full-duplex Gigabit Ethernet using BIDI technology—transmitting at 1550 nm and receiving at 1310 nm through one LC simplex connector. It’s a compact, hot-pluggable module built for dense network environments where fibre resources are limited.

Overview

The LWO-SFP-5531-20 is a 1.25 Gbps SFP transceiver that conforms to the SFP MSA and IEEE 802.3z standards. It uses a DFB laser and PIN photodiode to achieve a maximum transmission distance of 20 km on 9/125 µm singlemode fibre. Digital Diagnostic Monitoring (DDM) provides real-time monitoring of key parameters such as optical output power, received power, temperature, and supply voltage, enabling proactive network management.

What stands out

• Bi-directional (BIDI) communication over a single fibre, effectively doubling fibre capacity.
• Hot-pluggable SFP form factor for easy installation and replacement without network downtime.
• Digital Diagnostic Monitoring (DDM) for live performance tracking and fault isolation.
• Commercial operating temperature range (0°C to 70°C) suitable for standard enterprise environments.
• Low power consumption from a 3.3 V supply, reducing overall energy costs.

Technical details

• Data rate: 1.25 Gbps
• Transceiver type: SFP (Small Form-Factor Pluggable)
• Fibre type: Singlemode (SMF)
• Wavelength (Tx/Rx): 1550 nm / 1310 nm
• Max transmission distance: 20 km
• Connector: LC Simplex
• Duplex system: Simplex (BIDI)
• Digital Diagnostic Monitoring: Yes
• Hot-pluggable: Yes
• Supply voltage: 3.3 V
• Operating temperature: 0°C to 70°C
• Standards: IEEE 802.3z, SFP MSA
• Laser type: DFB
• Receiver type: PIN photodiode
• Application: Gigabit Ethernet, 1G Fibre Channel

Our verdict

The Lightwin LWO-SFP-5531-20 is a reliable and cost-effective solution for extending Gigabit Ethernet links up to 20 km over existing singlemode fibre. Its BIDI design and DDM capabilities make it an excellent choice for service providers and enterprises looking to maximise fibre utilisation while maintaining full visibility into link health.