Optical attenuator CBO SFA21BK12 singlemode, fixed 12 dB attenuation, inline fiber adapter

The BlueOptics Optical attenuator CBO SFA21BK12 is a singlemode fixed inline attenuator with 12 dB attenuation, designed to reduce optical power levels in fiber-optic links. Its compact, inline form factor enables simple insertion into patchcords or permanent links to protect sensitive receivers, prevent saturation and help equalize channel power. The device maintains signal integrity while providing a stable attenuation value suitable for testing, commissioning and routine power management in telecom, datacom and laboratory environments.

Advantages

This fixed 12 dB attenuator delivers predictable and stable attenuation with minimal insertion loss beyond the specified value and low return loss for singlemode systems. The inline adapter format allows quick deployment without reconfiguring existing connectors. The compact design is robust for lab use and field installations, and the device is compatible with standard singlemode connectors, ensuring straightforward integration into patch panels and fiber links.

Suitable for

• Reducing optical power to protect receivers in telecom and datacom networks
• Balancing channel power in wavelength-division multiplexing (WDM) systems
• System commissioning and routine maintenance/testing in labs and field environments
• Temporary inline attenuation during equipment upgrades or troubleshooting

Key specifications

• Mode: singlemode
• Attenuation: fixed 12 dB
• Form factor: inline fiber adapter
• Application: inline insertion for attenuation, testing and power management
• Compatibility: standard singlemode connector systems

How to use

Insert the attenuator inline between two singlemode fiber connectors by connecting it directly to the existing patchcord or adapter. Ensure connectors are clean before installation to avoid contamination-related loss. Verify the fiber alignment and secure the connection; no additional configuration is required. After insertion, confirm the received optical power at the downstream device to ensure the desired attenuation effect and system safety.

Recommendations

Use the attenuator in environments where fixed attenuation is required for receiver protection, channel balancing or testing. Avoid exposing connectors to dust and moisture, and keep connectors covered when not in use. For precise power adjustments during commissioning, combine fixed attenuators with calibrated test equipment and follow standard fiber handling procedures.