Exfo LFD-202P Live Fiber Detector

The Exfo LFD-202P is a handheld live fiber detector that identifies signal presence in optical fibers without requiring disconnection or network disruption. Using non-intrusive macrobending detection, it enables technicians to verify live fiber status across single-mode and multimode installations while preserving signal integrity and fiber condition. The instrument displays relative core power, detects continuous and modulated signals, and operates across a broad spectral range with sensitivity to –40 dBm equivalent core power.

Technical Specifications

• Signal Detection: Continuous signals or modulated at 270 Hz, 1 kHz, and 2 kHz


• Core Power Range: +14 dBm to –19 dBm with over-range indicators (HI >+15 dBm, LO <–40 dBm)


• Detector Sensitivity: –40 dBm equivalent core power (MDSP)


• Spectral Response: 800 nm to 1650 nm


• Fiber Slack Requirement: Minimum 1.9 cm (3/4 in) for detection


• Operating Temperature: –20 °C to 50 °C


• Storage Temperature: –40 °C to 70 °C


• Relative Humidity: 0% to 95% non-condensing


• Dimensions: 23.6 cm (H) × 3.0 cm (W) × 3.2 cm (D)


• Weight: 0.3 kg (0.6 lb)


• Power Source: 9 V alkaline battery with low battery indicator

Key Features

• Interchangeable adapter heads for 250 μm, 900 μm, and 3 mm fibers


• Optional heads available for jacketed fiber, coated fiber, and ribbon fiber configurations


• Hands-free operation with lockable Hold button


• Field-grade handheld design for mobile technician deployment


• Dual-window detection architecture for single-mode fibers (8 μm to 10 μm core diameter)

Typical Applications

• Live fiber verification in active telecommunications networks


• Signal presence confirmation during fiber termination and splicing


• Network maintenance and troubleshooting without service interruption


• Fiber route identification and tracing in multi-fiber installations

Compatibility & Integration The LFD-202P interfaces directly with singlemode and multimode fibers via interchangeable adapter heads, eliminating the need for external adapters or coupling modules. Standard inclusion of 250 μm, 900 μm, and 3 mm heads addresses common fiber geometries in deployed networks.