Gigabit single-mode fiber (SMF) transceivers typically operate at 1.25Gbps, use 1310nm or 1550nm wavelengths, and support link distances from 10km to 80km depending on the module type.

Key Parameters

Data Rate: Most Gigabit SMF transceivers operate at 1.25Gbps, suitable for 1000BASE-LX or 1000BASE-BX Ethernet applications . Wavelength:

• 1310nm is common for medium-range links up to 20km .
• 1550nm is used for long-reach links up to 80km . Link Distance:
• Standard SFP modules can support 10km to 20km over single-mode fiber .
• Extended reach modules, such as 1000BASE-LX 80km SFPs, allow up to 80km . Optical Power and Sensitivity:
• Typical transmit power (TX) ranges from -2dBm to 0dBm for long-reach modules .
• Receiver sensitivity (RX) is often around -22dBm for reliable Gigabit connectivity .
• Extinction ratio, rise/fall time, and optical eye parameters are specified to ensure signal integrity . Connector Type: Most Gigabit SMF SFPs use LC connectors, which are compact and support hot-pluggable installation . Monitoring and Compliance:
• Many modules support Digital Optical Monitoring (DOM) per SFF-8472, allowing real-time monitoring of optical output/input power, temperature, laser bias current, and supply voltage .
• Industrial-grade variants operate in -40°C to 85°C environments for harsh conditions .
• Modules comply with Class 1 laser safety standards (IEC-60825) . Form Factor: SFP (Small Form-factor Pluggable) modules are hot-pluggable, allowing easy replacement or upgrades without powering down the host device . Applications:
• Enterprise LANs, campus networks, and metropolitan access networks.
• FTTx links and industrial control systems requiring reliable long-distance Gigabit Ethernet . By considering these parameters—data rate, wavelength, optical power, link distance, connector type, and monitoring features—network engineers can select the appropriate Gigabit SMF transceiver for stable and efficient optical connectivity.