FIS OV-VFL Fiber Visible Laser Fault Locator / Sold individually

The FIS OV-VFL is a compact, pen-style visible laser fault locator designed for rapid field detection of fiber breaks, bends, and faulty connections in optical networks. Operating at 650 nm ± 10 nm, this Class 1 laser instrument emits a minimum of 1 mW in both continuous and pulsed modes, achieving detection ranges up to 10 km depending on fiber type and operating conditions.

Technical Specifications

• Laser Type: FP-LD


• Wavelength: 650 nm ± 10 nm


• Output Power: 1 mW minimum


• Laser Safety Rating: Class 1 (IEC 60825-2:2011)


• Operating Modes: Continuous Wave (CW) and Modulated (Pulsed)


• Detection Range: Up to 10 km; 4 km single-mode, 3 km multimode typical


• Fiber Compatibility: Single-mode and multimode (simplex)


• Power Supply: 2 × 1.5 V AA alkaline batteries


• Battery Life: Approximately 50 hours at 1 mW output


• Operating Temperature: −10 °C to 45 °C


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


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


• Weight: 120 g (without battery)


• Dimensions: φ15 × 180 mm

Key Features

• Universal 2.5 mm optical adapter (SC, FC, ST compatible); optional 1.25 mm adapter for LC and MU connectors


• LED indicators: green (continuous mode), flashing green (pulsed mode), red/flashing red (low battery)


• Recessed function button with hold-to-power-on design


• Pen-style retaining clip and tethered semi-translucent dust cap


• Ruggedized metal construction with rubber protective guard


• Toggle between continuous and pulsed modes via single button control

Typical Applications

• Fiber break and damage detection in field installations


• Connection integrity verification in optical networks


• Rapid fault isolation for network troubleshooting


• On-site diagnostics for telecommunications and data center infrastructure

Compatibility & Integration The OV-VFL accepts both single-mode and multimode simplex fibers. Standard 2.5 mm adapter accommodates SC, FC, and ST connectors; optional 1.25 mm adapter enables LC and MU connector support.