Fibre Optic Attenuator CBO SFA21BK2 Singlemode LC Simplex 2 dB

The BlueOptics Optical Fiber Attenuator SFA21BK2 is a passive singlemode inline attenuator with an LC simplex connector and 2 dB attenuation. It is designed to reduce optical power levels between fiber optic devices to protect receivers from overload and to achieve correct power balance in links. The compact plug-and-play form factor is suitable for use in patch panels, transceivers and temporary test setups, providing stable attenuation with minimal back-reflection.

Advantages

This singlemode LC simplex attenuator delivers a defined 2 dB loss with consistent performance across typical singlemode wavelengths. The connectorized design enables quick insertion into existing links without splicing or additional hardware. Low return loss and mechanical stability ensure reliable signal conditions in racks and field installations. The passive construction requires no power and has no active components, reducing failure modes and maintenance needs.

Suitable for

• Reducing optical power to prevent receiver saturation in singlemode links
• Integration with LC simplex ports on transceivers and patch panels
• Temporary attenuation during testing and commissioning of fiber networks
• Fine-tuning link power budgets in data centres and telecom closets

Key specifications

• Fiber type: singlemode
• Connector: LC simplex
• Attenuation: 2 dB nominal
• Form factor: inline connectorized attenuator
• Return loss: optimized for low back-reflection (typical for singlemode components)
• Operation: passive, no power required

How to use

Insert the LC connector of the attenuator into the LC receptacle of the transmitting or receiving device, or mount it within a patch panel where the LC simplex interface is available. Ensure connectors are clean before mating to avoid contamination and signal loss. The attenuator is polarity-preserving; connect one end inline between the transmitting and receiving ports to achieve the specified 2 dB reduction in optical power. For temporary tests, use the attenuator in the test lead or directly on the transceiver port.

Recommendations

Confirm required attenuation by measuring optical power levels before and after inserting the attenuator. Use appropriate cleaning tools for LC connectors and avoid excessive bending of the fiber near the connector. Store the attenuator in protective packaging when not in use to prevent dust ingress and mechanical damage.