Optical Fiber Inline Attenuator CBO SFA21BK15 Singlemode 15 dB

The BlueOptics Optical Fiber Inline Attenuator SFA21BK15 is a compact passive device that provides a fixed 15 dB attenuation for singlemode fiber links. Intended for insertion into patchcords or fiber lines, this inline attenuator reduces optical power to prevent receiver overload and to balance link budgets in telecommunications, data center and test environments. Its simple, connectorized form factor makes it suitable for use where a reliable, maintenance-free attenuation is required without additional equipment.

Advantages

This inline attenuator offers a precise fixed attenuation of 15 dB, enabling predictable reduction of optical signal strength. Its singlemode compatibility ensures stable performance on standard ITU-T singlemode wavelengths. The passive design requires no power and introduces minimal mechanical complexity, while the compact connectorized housing supports easy insertion and removal in existing fiber runs. The device is designed to maintain signal integrity and to minimize back reflections when used according to fiber type and connector specifications.

Suitable for

• Balancing optical power between transmitter and receiver in singlemode links
• Preventing receiver saturation in telecom and datacentre equipment
• Temporary or permanent insertion in patchcords during testing and commissioning
• Maintenance tasks and troubleshooting of fibre-optic networks

Key specifications

• Attenuation: fixed 15 dB
• Fiber type: singlemode
• Connectorized inline design for easy insertion into fiber lines
• Passive device — no external power required
• Compact form factor suitable for patch panels and field use

How to use

Insert the inline attenuator into the fiber link by disconnecting the patchcord or fiber connector at the desired point and coupling the attenuator between the two connectors. Ensure that connector types and polish styles are compatible and that connectors are clean before mating to avoid additional loss or contamination. After insertion, verify signal levels and link performance to confirm the 15 dB reduction and proper operation of connected equipment.

Recommendations

Use the attenuator with singlemode transceivers and patchcords matched to the same connector and fiber specifications. Clean connectors before use and avoid repeated mating cycles beyond manufacturer guidelines. For precise link budgeting, measure optical power before and after insertion to confirm actual attenuation under system conditions.