Optical attenuator CBO SFA24BK5 singlemode, fixed 5 dB attenuation, fiber optic inline

CBO SFA24BK5 is a singlemode optical attenuator with fixed 5 dB attenuation designed for inline fiber optic connections. It reduces optical signal power to prevent receiver overload and to help match link budgets in fiber networks. The attenuator is compatible with standard singlemode connectors and provides stable, passive performance without requiring user adjustment, making it suitable for testing, laboratory environments and permanent installations.

Advantages

The fixed 5 dB attenuation value delivers predictable signal reduction and repeatable results across installations. Its singlemode construction ensures low back reflection and maintains signal integrity for long-distance links. The inline, compact design allows easy integration into existing fiber runs and test setups without additional equipment. As a passive device it requires no power and provides long-term stability with minimal maintenance.

Suitable for

• Preventing receiver saturation in optical links
• Balancing power levels in point-to-point singlemode networks
• Laboratory testing and measurement setups
• Temporary or permanent inline insertion during installation and commissioning

Key specifications

• Attenuation: fixed 5 dB
• Fiber type: singlemode
• Connection type: inline connector-compatible for standard singlemode interfaces
• Operation: passive, no power required
• Performance: low back reflection suitable for long-haul and metro links

How to use

Insert the attenuator inline between two compatible singlemode fiber connectors, ensuring connectors and ports are clean before mating. The device operates immediately upon insertion and requires no configuration. For temporary testing, connect it at the test point; for permanent installations, secure the inline connection according to standard cabling practices to avoid strain or contamination. Verify optical power levels with a power meter after insertion to confirm the expected 5 dB reduction.

Recommendations

Before connecting, clean fiber endfaces and inspect connectors to prevent contamination. Use an optical power meter to measure pre- and post-attenuation levels and confirm that the reduced signal meets receiver input specifications. Avoid exposing the attenuator to excessive mechanical stress, moisture, or extreme temperatures during installation and operation.