Single-mode SFP fiber

A Single Mode Fiber SFP is a hot‑swappable optical transceiver that uses laser light (typically 1310 nm or 1550 nm) to transmit data over 9/125 µm single‑mode fiber for distances ranging from 10 km to over 80 km, depending on the module type.What a Single Mode Fiber SFP Is

• A compact optical module designed for switches, routers, and media converters.
• Uses laser-based transmission for long‑distance, low‑loss communication.
• Supports standard SMF (OS1/OS2) with a small core diameter (~9 µm).

Key Specifications

• Wavelengths: 1310 nm or 1550 nm.
• Distances:
  • Typical: 10 km (1000BASE‑LX)
  • Extended: 40–80 km (1000BASE‑ZX)
  • Some modules reach 120 km depending on optical budget.
• Data Rates: 1 Gbps (SFP), 10 Gbps (SFP+), higher for newer variants.
• Connector: Usually duplex LC.
• Diagnostics: Many support DOM/DDM for monitoring optical power and temperature.

Common StandardsStandardWavelengthDistanceNotes1000BASE‑LX1310 nmUp to 10 kmCan run on MMF with MCP. 1000BASE‑ZX1550 nm40–80 km+Long‑haul applications. Applications

• Campus and building interconnects
• Metro and telecom networks
• Data center uplinks
• Long‑distance backbone links

Related Variant: Single‑Fiber (BiDi) SFP

If you need to run links over one fiber instead of a pair, BiDi SFPs use WDM to transmit and receive on different wavelengths (e.g., 1310 nm TX / 1550 nm RX).

Single Mode Fiber SFP modules are essential for long‑distance, high‑bandwidth optical networking.