Optical attenuator CBO SFA22BK1 Singlemode 1 dB — fixed in-line fiber attenuator

The BlueOptics CBO SFA22BK1 Singlemode 1 dB fixed in-line optical attenuator is designed to reduce optical signal power in singlemode fiber links by a precise 1 dB. It is intended for insertion into fiber runs to prevent receiver saturation, balance channel power and fine-tune link budgets during installation, maintenance and testing of telecom, datacom and CATV networks. The attenuator is compact, passive and provides a stable, wavelength-independent attenuation level suitable for singlemode systems.

Advantages

This fixed in-line fiber attenuator offers a defined 1 dB attenuation with low insertion loss beyond the specified attenuation, maintaining signal integrity in singlemode networks. Its passive design requires no power and provides predictable, long-term performance with minimal back reflection. The compact inline form factor simplifies integration into existing patchcords or fiber trunks without additional mountings or adapters.

Suitable for

• Balancing optical power between transmitter and receiver in singlemode links
• Preventing receiver saturation in high-power fiber systems
• Field testing and commissioning of telecom, datacom and CATV networks
• Laboratory measurements where a small, fixed attenuation is required

Key specifications

• Attenuation: fixed 1 dB
• Fiber type: singlemode
• Form factor: in-line (connectorized passive attenuator)
• Typical insertion loss beyond attenuation: low (designed for minimal excess loss)
• Return loss: designed to provide low back reflection suitable for singlemode applications
• Operating wavelength: compatible with standard singlemode telecom wavelengths

How to use

Install the attenuator inline by connecting it between two compatible singlemode connectors or patchcords, ensuring proper connector types and clean endfaces before mating. Place the attenuator as close as practical to the receiver when preventing saturation, or at the designated test point during commissioning. After insertion, verify optical power levels and system performance to confirm the expected 1 dB reduction and adjust link components if necessary.

Recommendations

Prior to installation, clean all connector endfaces and inspect for damage to ensure low insertion loss and reliable performance. Use the attenuator within the specified operating wavelength range and avoid subjecting the unit to excessive mechanical stress or bending. For precision measurements, allow the link to stabilize thermally before recording power levels.