CBO optical fiber attenuator SFA23BK3, BlueOptics singlemode, 3 dB attenuation

The BlueOptics CBO optical fiber attenuator SFA23BK3 is a fixed singlemode attenuator with 3 dB nominal attenuation, designed for insertion into singlemode fiber links to reduce optical power levels. It provides controlled attenuation to prevent receiver saturation, support link budget adjustments and enable accurate testing and maintenance in telecom and datacom environments. The attenuator uses a standard singlemode connector interface and is intended for stable, repeatable performance in point-to-point links, test setups and installation tasks.

Advantages

This fixed singlemode attenuator delivers a precise 3 dB reduction in optical power with stable performance across typical operating conditions. Its compact, plug-and-play design allows quick insertion into fiber runs without additional tools. The component is compatible with common singlemode connectors and is suitable for both field and laboratory use, offering repeatability and minimal insertion loss variability over time.

Suitable for

• Preventing optical receiver saturation in singlemode transmission links
• Adjusting link budget during installation or maintenance
• Laboratory and field testing of singlemode fiber equipment
• Temporary attenuation during diagnostic procedures or equipment commissioning

Key specifications

• Attenuation: 3 dB nominal
• Fiber type: singlemode
• Connector interface: standard singlemode connector compatible
• Form factor: fixed inline attenuator for easy insertion
• Typical application: telecom and datacom singlemode links, testing and maintenance

How to use

Install the attenuator by inserting it into the optical path between the transmitter and receiver or between a test instrument and the device under test. Ensure connectors are clean before mating to avoid contamination and excess loss. For temporary testing, insert the attenuator into patch cords or between adaptors as required. Verify link performance after installation and remove or replace the attenuator when changes to the link budget are complete.

Usage recommendations

Use a fiber inspection tool and cleaning procedure before connecting to preserve signal quality. Keep the attenuator capped when not in use and avoid exposing it to mechanical stress or contamination. For precise measurement tasks, confirm the effective attenuation with a calibrated optical power meter and, if necessary, account for connector losses in the overall link budget.