• Bi-Directional, Inline, Variable Fiber Optical Attenuators (VOA)
• Collimator-Based Manually Variable Attenuation
• 1 m Long Single Mode Fiber Pigtail on Each Side

Thorlabs' Single Mode Variable Optical Attenuator allows the user to manually vary the attenuation of the signal in the fiber as it is transmitted through the device. This VOA can be used to precisely balance the signal strengths in fiber circuits or to balance an optical signal when evaluating the dynamic range of the measurement system.

All in-line VOAs have single mode fiber pigtails with a Ø3 mm jacket. This VOA is terminated with 2.0 mm narrow key FC/APC connectors. For other connector styles or custom requests, please contact technical support.

Each attenuator has a lens to collimate the light from the input fiber. A blocking device can be manually adjusted by a screw to change the beam x-y offset or angular deviation. Then, a second lens is used to couple light into the output fiber. Thus, the coupling efficiency is changed until the desired attenuation is obtained.

• Thermination: FC/APC
• Operating Wavelength: 1200 – 1600 nm
• Attenuation Range:1.5 – 50 dB
• Attenuation Resolution: <0.1 db
• Insertion Loss: =1.5 dB
• Return Loss: >55 dB
• Max Power: 300 mW
• Operating Temperature: 0 to 60 °C
• Storage Temperature: -40 to 85 °C
• Fiber: SMF-28
• Dimensions: 38 mm x 30 mm x 19 mm