EXFO: LFD-300B FiberFinder

The EXFO LFD-300B FiberFinder is a non-intrusive live fiber identifier that enables technicians to accurately identify active singlemode fibers without disconnecting them or disrupting network traffic. It detects 270 Hz, 1 kHz, and 2 kHz tones, as well as live traffic direction, making it a precise and reliable tool for testing and maintenance. It helps prevent outages, eliminates guesswork during fiber identification, and protects the fiber from damage.

Connector Type

• No Connector Required
  Clamps directly onto singlemode fiber; optimized for 900 µm and 1.6 mm jacketed fiber.

Benefits & Applications

• Accurate Live Fiber Detection
  Identify active fibers without disconnecting or disrupting service—ideal for in-field testing and maintenance.
• Tone and Traffic Direction Detection
  Detects 270 Hz, 1 kHz, and 2 kHz test tones, along with live traffic direction, for confident fiber identification.
• Eliminate Guesswork and Outages
  Helps technicians avoid misidentification errors that can lead to service disruption or unnecessary downtime.

Key Features

• Identifies 270 Hz, 1 kHz, 2 kHz tones and detects traffic direction
• In-line, non-disruptive detection of live signals
• Auto-optimized bending angle for accurate power estimation
• Max 1 dB insertion loss for most singlemode fiber types
• No damage to fiber—automatically releases when no signal is present