Attenuator BlueOptics SFA21XK3 LC 3dB Silver

The BlueOptics SFA21XK3 LC 3dB Silver attenuator provides a precise 3 dB reduction for LC/UPC simplex connections in multimode 50/125 µm fiber links at 850 nm. Designed for situations where high transmitter power could overload a receiver over short distances, this inline fiber attenuator uses a zirconia ceramic ferrule and branded fiber components to maintain signal quality while lowering optical power. The silver housing offers a compact, durable form factor suitable for rack and patch-panel installations and field use.

Advantages

This attenuator delivers a stable 3 dB attenuation with low additional input loss and high return loss values. Manufactured with high-quality materials—branded multimode fiber and reliable LC/UPC connectors with a zirconia ceramic ferrule—it supports up to 1500 mating cycles. Devices are tested with interferometer and OTDR; each unit ships with a measurement protocol for input loss and return loss. The unit is rated for operation in a wide temperature range and features an LSZH (low smoke zero halogen) housing that reduces smoke and avoids halogen emissions in case of fire.

Suitable for

Key specifications

How to use

Insert the LC/UPC simplex connector of the attenuator inline between the transmitting device and the receiving device, ensuring clean connector endfaces before connection. Use appropriate dust caps when the attenuator is not in use to protect the ferrule. Verify the optical power levels after installation using an optical power meter to confirm that the 3 dB attenuation achieves the intended signal reduction. If further adjustment is required, choose a different attenuation value from the BlueOptics product range.

Recommendations

Clean connector endfaces with suitable fiber cleaning tools before mating, avoid excessive bending of the fiber around the attenuator, and store the unit with protective caps when not connected. Refer to the supplied measurement protocol to confirm input and return loss values and verify compatibility with your multimode 850 nm equipment.