Exfo LFD-250B Live Fiber Detector
The Exfo LFD-250B Live Fiber Detector is a handheld tool used to identify live optical fibers without disrupting traffic. It features a non-destructive macro-bending technology that clamps onto the fiber, detecting the presence and direction of optical signals. Ideal for maintenance, troubleshooting, and identifying fibers during network deployments.
- Model
- Exfo LFD-250B
- Calibration
- Available on request
- Price
- $540
- Status
- In stock
- RFQ ref
- LFD-250B
This unit
The EXFO LFD-250B is a handheld live fiber detector that identifies active optical fibers non-intrusively using step-motor-activated macro-bending technology. The instrument detects signal presence and traffic direction, pinpoints dark fiber through tone recognition at 270 Hz, 1 kHz, and 2 kHz, and measures in-line optical power - all without disrupting network traffic or damaging the fiber. Unlike traditional fixed-angle bending detectors, the LFD-250B continuously optimizes the bending angle to minimize insertion loss while maximizing detection reliability.
The motor-controlled approach ensures insertion loss remains ≤1 dB across all singlemode telecom fibers and wavelengths, with the fiber automatically released when no signal is detected, preventing stress-induced damage.
Technical Specifications
- Power Measurement Range: −35 dBm to +20 dBm
- Power Measurement Accuracy: 1 dB repeatability, achieved through insertion loss monitoring and exiting signal measurement with automatic coupling efficiency adjustment by jacket size
- Insertion Loss: ≤1 dB (guaranteed for all singlemode telecom fibers at all wavelengths)
- Tone Detection: 270 Hz, 1 kHz, 2 kHz
- Test Duration: <6 seconds
- Battery: Four AA alkaline or rechargeable cells; AC adapter available (indoor use only)
Key Features
- Motor-controlled fiber bending optimizes detection for each fiber type and wavelength
- Traffic direction verification via dual LEDs (left LED indicates rightbound traffic; right LED indicates leftbound traffic)
- Ambient light offset with optional push-down cap for high ambient light environments
- Tone signal LED for 270 Hz, 1 kHz, and 2 kHz identification
- Locating LED that flashes when the clamping mechanism engages
- Battery status monitoring with low-battery indicator
Compatibility & Integration The LFD-250B accommodates 900 µm, 1.6 mm, and 3 mm jacket diameters. Use with caution on 250 µm fibers, as the clamping pressure may cause damage. The instrument is optimized for singlemode telecom fibers across all standard wavelengths.
Specifications
| Parameter | Value |
|---|---|
| Power Range (dBm) | '-35 dBm to +20 dBm |
Exfo LFD-250B — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Exfo LFD-250B. Calibration covers detector responsivity at 850, 1310, 1490, 1550, and 1625 nm, absolute power accuracy, linearity across the full dynamic range, and reference power level. All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Exfo LFD-250B faults: detector contamination, damaged FC/PC input port, display failure. Common repairs include detector port cleaning or replacement, display repair, and battery or capacitor replacement in older HP/Agilent/Keysight units.
Exfo LFD-250B price
This Exfo LFD-250B is listed at $540. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Exfo LFD-250B calibration cost
NIST-traceable calibration for the Exfo LFD-250B is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Calibration for this instrument covers detector responsivity at 850, 1310, 1490, 1550, and 1625 nm, absolute power accuracy, linearity across the full dynamic range, and reference power level. Turnaround is 1 to 3 business days after receipt. See full calibration details →
