This handheld source delivers stable, precise light for single-mode fiber testing. It is engineered for 1310 nm and 1550 nm operation and offers multiple modulation modes, automatic wavelength detection, and power-saving features. It is complete with universal PC/UPC connector adapters.  

Key Features

• Dual-Wavelength Output: 1310 nm and 1550 nm ±20 nm with ≤5 nm spectral width
• Stable Performance: ≤0.05 dB drift over 15 minutes; adjustable output from –5 to –12 dBm (–7 dBm typical)
• Multiple Modulation Modes: CW, 270 Hz, 330 Hz, 1 kHz, and 2 kHz for versatile testing
• Smart Power Management: Backlight auto-control, configurable 10-minute auto-off, and ≥25 hours runtime on three AA batteries
• Universal Adapters: Includes FC, SC, ST, and FC-LC (PC/UPC) connector tips for full single-mode compatibility
• User-Friendly Design: 2.4″ color LCD, kickstand for hands-free use, and rugged carry case

What’s Included

• Optical Light Source
• FC-UPC, SC-UPC, ST-UPC, and FC-LC-UPC adapters
• Two fiber-cleaning swabs
• Instruction manual
• Three AA batteries
• Protective carrying case

Specifications

• Wavelengths: 1310/1550 nm ±20 nm
• Spectral Width: ≤5 nm
• Output Power: –7 dBm typical; –5 to –12 dBm adjustable
• Stability: ≤0.05 dB over 15 minutes
• Modulation Frequencies: CW, 270 Hz, 330 Hz, 1 kHz, 2 kHz
• Display: 2.4″ color LCD
• Power: 3× AA batteries (≥25 hr)
• Auto-Off Timer: 10 minutes (configurable)
• Operating Temp.: –10 °C to +60 °C
• Storage Temp.: –25 °C to +70 °C
• Dimensions: 7″ × 3.19″ × 1.25″ (178 × 81 × 32 mm)
• Weight: 0.64 lb (290 g)

Optimize your single-mode fiber testing with this feature-rich, field-ready light source.

Documentation

• FLS-50 Data Sheet
• FLS-50 Instructions