Optical attenuator CBO SFA21BK20 Singlemode LC Simplex 20 dB

The BlueOptics Optical attenuator CBO SFA21BK20 Singlemode LC Simplex 20 dB is a fixed in-line device for reducing optical signal power in singlemode fiber links. It features an LC simplex connector and provides a nominal 20 dB attenuation to protect receivers from overload, to match power levels in transmitter–receiver pairs, or to create defined loss conditions in test and measurement setups. The compact LC simplex housing allows easy insertion into patch panels, fiber cords, or test leads without additional adapters.

Advantages

This fixed attenuator delivers a stable 20 dB attenuation with repeatable performance and low back reflection suitable for singlemode systems. The LC simplex form factor keeps installation space minimal and enables direct in-line use with standard LC-terminated fibers. Its robust housing provides reliable mechanical protection for the attenuating element while maintaining consistent optical characteristics across typical telecommunication and datacom environments.

Suitable for

• Reducing optical power to prevent receiver saturation in singlemode networks
• Balancing transmitter and receiver power levels during link commissioning
• Creating defined loss for optical test, measurement, and calibration
• Temporary insertion in patch panels, distribution frames, or test leads

Key specifications

• Fiber type: singlemode
• Connector type: LC simplex
• Nominal attenuation: 20 dB
• Form factor: in-line fixed attenuator
• Typical application: telecommunication, datacom, laboratory testing

How to use

Insert the attenuator directly between two LC-terminated fiber connectors, ensuring clean connector endfaces before mating. Align and gently push the LC connector into the mating adapter or connector until it latches; avoid excessive force. For test measurements, install the attenuator in the measurement path and allow the system to stabilize before recording power values. When not in use, protect the connector ends with dust caps to prevent contamination.

Recommendations

Inspect and clean LC connectors prior to use, verify the required 20 dB attenuation for your link budget, and avoid repeated rough handling to maintain stable optical performance.