LFW2 / W2S Mini Stable Optical Light Source

Dual-Wavelength Laser Light Source for Fiber Optic Testing & Engineering

The LFW2/LFW2S is a compact, handheld stable light source designed for single-mode fiber optic testing. It delivers 1310 nm and 1550 nm laser output as standard, with 1–4 wavelength configurations available on request. Built for reliability in the field, it's an ideal companion instrument for optical power meters during insertion loss testing, and a go-to tool for FTTx/FTTH installation, telecom network maintenance, and data center fiber engineering.

Key Features

• Auto power-off to conserve battery
• Wavelength memory — resumes last-used wavelength on restart
• Compatible with SC, FC, and ST connector interfaces
• Ultra-long standby/operating battery life
• One-key wavelength switching
• Optical path (frequency) modulation support
• LCD display shows real-time working wavelength and status
• High-stability multi-wavelength, single/multi-mode laser output
• CW (continuous wave) or modulated output modes
• USB charging support

Technical Specifications

Specifications are for reference only; the actual product shall prevail.

Operation Guide

Note: User-defined output power calibration and factory reset are exclusive features of the W2S model.

Standard Package Includes

• 1 × Main unit
• 1 × Product warranty card
• 1 × Certificate of conformity
• 1 × User manual
• 1 × Built-in rechargeable lithium battery
• 1 × USB charging cable

Charging

The unit uses a standard USB charging port. While powered on, the battery indicator flashes during charging and stops flashing once charging is complete.

Care & Maintenance

• Never look directly into the laser output port during operation — laser radiation can cause eye injury.
• Keep the sensor end face clean at all times. Avoid unclean or non-standard adapter connectors, and avoid inserting poorly polished ferrules, as this can damage the sensor face and introduce measurement error.
• Insert and remove adapter connectors carefully to avoid scratching the port.
• Always replace the dust cap when the device is not in use, to keep the end face clean and prevent measurement drift from airborne dust.
• After extended use, residue may build up on the internal sleeve of the optical output port, reducing output power. Clean with an alcohol swab; if this doesn't resolve the issue, contact the manufacturer.
• For any other malfunction, contact us promptly rather than disassembling the instrument. Devices that have been opened or repaired by unauthorized parties are not eligible for further service support.

Troubleshooting

Warranty

• Warranty period: 12 calendar months from the date of receipt, covering product quality and workmanship. Quality issues identified within this period will be repaired or replaced accordingly. In all cases, our liability is limited to the original purchase price of the product.
• If an issue cannot be resolved using the troubleshooting guidance above, please contact us directly — do not open the housing without authorization.
• Faults caused by product or material defects are repaired or replaced free of charge.
• This warranty applies only to instruments used under normal operating conditions. It does not cover damage from accidents, misuse, or unauthorized disassembly/repair; we reserve the right to decline warranty service in such cases.

Manual content is subject to change without prior notice. Version: V1.0