1. Description 

1.1. General Introduction 

The FX-UNLL is an ultra-narrow-linewidth laser designed to meet the demands of applications requiring extreme accuracy, high resolution, and long-term reliability. This module is built to operate 24/7 in harsh field conditions. Its compact size makes it ideal for seamless integration into advanced fiber optic sensing systems, such as distributed acoustic, temperature, and strain sensing, remote sensing, LIDAR, spectroscopy, and more. 

1.2. Key Features 

• Single longitudinal mode 

• Ultra-narrow-linewidth, < 500Hz available 

• C-band, ITU DWDM or custom wavelength 

• Mode hop free 

• PM fiber pigtail with slow-axis alignment 

• Telcordia GR-468 qualified

2. Characteristics

3. Operation and Storage Conditions

4. Fiber Connector

5. Part Number

Example: 

FXUNLL-34-2-A-WD 

Wavelength 1550.12nm (ITU-C34), Power Level 2 (20mW), Linewidth (500Hz ~ 1KHz), Wide Operation Temperature: -40 ~ 75℃

6. Design

7. Typical Test Data