The EXFO LFD-250 Live Fiber Detector identifies active optical signals and traffic direction within fiber optic networks without disrupting service. This non-intrusive field instrument pinpoints live fibers, determines signal flow direction, and detects dark fibers using injected tones—all while maintaining guaranteed insertion loss of ≤1 dB. A step-motor-activated bending mechanism automatically optimizes the fiber bend angle for each fiber type and wavelength, eliminating the limitations of fixed-angle designs and preventing fiber damage. The detector delivers virtually 100% reliability in traffic detection, direction identification, and tone recognition across multiple wavelengths.
## Technical Specifications
**Insertion Loss:** Maximum 1 dB guaranteed across all singlemode telecom fiber types and wavelengths.
**Power Measurement Accuracy:** 1 dB repeatability for in-line dBm readings.
**Detection Reliability:** Virtually 100% for traffic, direction, and tone detection.
**Test Performance:** Up to three times faster than traditional methods; individual tests complete in less than 6 seconds.
## Key Features
• **Non-Intrusive Detection:** Identifies live signals and traffic direction without service interruption.
• **Optimized Bending Mechanism:** Step-motor automation adjusts fiber bend angle per fiber type and wavelength, ensuring minimal loss and eliminating fiber stress.
• **In-Line Power Measurement:** Direct dBm readout without network disruption.
• **Dark Fiber Identification:** Recognizes simulated tones at 270 Hz, 1 kHz, and 2 kHz.
• **Modulation Detection:** Confirms presence and characteristics of optical signals.
• **Jacket Size Recognition:** Automatic coupling efficiency adjustment for 900 µm, 1.6 mm, and 3 mm jacket sizes.
• **Ambient Light Rejection:** Built-in offset feature with optional push-down cap for high-intensity ambient light conditions.
## Typical Applications
• FTTH network deployment and verification
• Live network maintenance and fiber identification
• Link budget evaluation during active service
• Troubleshooting without planned downtime
## Compatibility & Integration
Operates across standard telecom wavelengths and fiber jacket sizes without requiring fiber disconnection or service rerouting.
