Exfo FLS-300 Network Testing Optical Light Source

The EXFO FLS-300 is a handheld optical light source engineered for fiber optic network testing and cable characterization. It emits stable, calibrated light signals across multiple wavelengths and fiber types, enabling field technicians to perform loss measurements, continuity checks, and FTTx validation. The instrument integrates with EXFO's power meters and optical loss test sets through encrypted auto-wavelength recognition, reducing setup time and calibration errors.

Technical Specifications

• Calibrated wavelengths: 850 nm, 1300 nm, 1310 nm, 1490 nm, 1550 nm, and 1625 nm (model-dependent)


• Supports ITU-T PON wavelengths: 1310 nm, 1490 nm, 1550 nm


• Single port: up to three single-mode wavelengths


• Dual port: up to four wavelengths (two multimode, two single-mode) Output Power


• Single-mode fiber: ≥1 dBm


• Multimode fiber (62.5/125 µm): >−20 dBm


• Power stability: ±0.10 dB over 8 hours Fiber Compatibility


• Singlemode (SM) and multimode (MM) fiber support


• Connectors: ST, SC, LC, E-2000, DIN 47256


• Polish options: UPC or APC Tone Generation


• 270 Hz, 1 kHz, 2 kHz Battery


• Autonomy: up to 120 hours (auto mode) Safety & Calibration


• Class 1 laser product


• Calibration interval: 3 years

Key Features

• Auto-wavelength recognition via encrypted digital protocol


• Encrypted distant referencing for long-distance power reference transmission


• Highest output power in its class


• Multi-wavelength output on single and dual ports

Typical Applications

• FTTx network validation and commissioning


• Passive optical network (PON) testing


• Fiber loss and continuity measurements


• Field troubleshooting of single-mode and multimode installations

Compatibility & Integration The FLS-300 integrates with the FPM-300 Power Meter and FOT-300 Optical Loss Test Set through encrypted auto-wavelength protocols, enabling automatic calibration parameter selection across compatible instruments.