CBO SFA22BK25 Optical Attenuator Singlemode 25 dB

The BlueOptics Optical Attenuator CBO SFA22BK25 Singlemode 25 dB is an inline singlemode attenuator that reduces optical signal power by 25 dB. Designed for use in laboratory environments and field deployments, this compact attenuator integrates into standard singlemode fiber links with common connector types. It provides controlled attenuation to prevent receiver saturation, enable accurate link testing and help balance optical power between network segments.

Advantages

The attenuator delivers a fixed, stable 25 dB attenuation value with minimal insertion loss and low back reflection, supporting consistent test results and predictable performance when adjusting power levels. Its compact, inline form factor simplifies installation in patch panels, test setups or field assemblies without requiring special adapters. The device is compatible with typical singlemode fiber connectors and is built to maintain signal integrity across a wide range of optical wavelengths used in telecommunications and testing.

Suitable for

• Preventing receiver overload and saturation in singlemode fiber links
• Optical link testing and power margin measurements in labs and field sites
• Balancing power levels between transmitters and receivers
• Temporary insertion during commissioning, maintenance or troubleshooting

Key specifications

• Attenuation: fixed 25 dB
• Fiber type: singlemode
• Form factor: inline attenuator
• Connector compatibility: standard singlemode connectors (industry standard types)
• Typical return loss: low back reflection suitable for test and telecom use
• Application wavelengths: compatible with common singlemode telecom/test wavelengths

How to use

Insert the attenuator inline between the transmitting and receiving fiber connectors, ensuring clean connector end-faces before mating. Align connector types and securely couple the attenuator to the existing fiber patch cords or equipment ports. Once installed, verify optical power levels with a power meter or test instrument to confirm the expected 25 dB reduction. For repeated use, keep connectors covered when not in use and clean them according to standard fiber optic handling procedures.

Recommendations

Use appropriate connector cleaning tools and dust caps to preserve performance. Verify compatibility of connector types and optical wavelength with your equipment before insertion. When performing measurements, allow for connector mating variability by taking multiple readings and using calibrated test instruments.