CBO SFA23BK20 Singlemode 20 dB Fibre Optic Attenuator

The BlueOptics Fiber Optic Attenuator CBO SFA23BK20 Singlemode 20 dB is a fixed singlemode inline attenuator that reduces optical power by 20 dB. It is intended for use in singlemode fiber links to lower signal strength to safe and optimal levels for receivers, preventing saturation and allowing accurate measurements during testing or stable operation in permanent installations. The compact design and standard connector interfaces make it suitable for telecom racks, network cabinets and data centre patch panels.

Advantages

This fixed attenuator provides a precise 20 dB reduction in optical power with minimal back reflection, supporting stable singlemode transmission. Its compact footprint and robust ferrule construction enable easy insertion into existing fiber runs without special tools. The device is compatible with common singlemode connectors and designed for reliable long-term use in professional network environments.

Suitable for

• Preventing receiver saturation in singlemode optical links
• Adjusting optical power levels during commissioning and testing
• Permanent attenuation in telecom and data centre installations
• Laboratory and field testing where controlled power reduction is required

Key specifications

• Attenuation: fixed 20 dB
• Transmission window: singlemode operation (OS1/OS2 wavelength range compatibility)
• Connector type: compatible with standard singlemode connectors
• Return loss: low back reflection suitable for singlemode systems
• Operating temperature range: suitable for indoor telecom and data centre environments
• Form factor: compact inline attenuator for rack and panel mounting

How to use

Insert the attenuator inline between two mating singlemode connectors, ensuring proper alignment of connector end faces before coupling. For testing, place the attenuator at the output of the transmitter or at an intermediate point to achieve the required 20 dB reduction and then verify power levels with an optical power meter. For permanent installations, secure connections in the patch panel or adapter and avoid sharp bends or mechanical stress on the fiber around the attenuator.

Recommendations

Handle the attenuator using clean hands or gloves and always inspect and clean connector end faces before insertion. Store the device with protective caps when not in use and avoid exposure to excessive dust, moisture or mechanical impact to maintain stable attenuation and low insertion loss.