Attenuator BlueOptics SFA21XK5 LC 5dB Silver

The BlueOptics SFA21XK5 LC 5dB Silver attenuator provides precise optical power reduction for multimode 50/125 µm fiber links operating at 850 nm. Built with an LC/UPC simplex connector and a zirconia ceramic ferrule, this in-line fixed attenuator delivers a stable 5 dB attenuation to prevent receiver saturation on short-distance or high-power installations. The unit is finished in silver and uses low-loss fiber and branded connector components to maintain signal integrity while fitting standard patch panels and fiber assemblies.

Advantages

This attenuator offers a defined 5 dB attenuation with low insertion loss and high return loss, helping to control optical signal levels without introducing significant additional loss. Manufactured using quality fiber and branded connectors, the device is durable and supports a high mating cycle count. The product is factory-tested with interferometry and OTDR measurements; a measurement protocol with input loss and return loss values is included with each unit. The LSZH jacket reduces smoke and halogen emission in case of fire and the component conforms to common industry standards.

Suitable for

• Multimode fiber networks (50/125 µm) operating at 850 nm
• Short-reach links where transmitter power must be reduced to avoid receiver overload
• Patch panels, equipment front-ends and fiber patchcord assemblies with LC connectors
• Laboratory setups and field installations requiring fixed 5 dB attenuation

Key specifications

• Attenuation: fixed 5 dB
• Connector type: LC/UPC simplex
• Fiber type support: multimode 50/125 µm
• Nominal wavelength: 850 nm
• Ferrule material: zirconia ceramic
• Jacket: LSZH (low smoke, zero halogen)
• Operating temperature range: -40 °C to +75 °C
• High return loss and low input loss; factory-tested with interferometer and OTDR

How to use

Insert the LC connector of the attenuator between the transmitter and the receiver or as part of a patchcord assembly to achieve the required 5 dB reduction in optical power. Ensure connectors are clean and free of dust before mating to preserve low insertion loss and prevent damage to the ferrule. Align the polarity and connector orientation with the existing link; the attenuator is passive and requires no power or configuration. After installation, verify optical power levels at the receiver and, if available, compare to the supplied measurement protocol to confirm expected attenuation.

Usage recommendations

For reliable performance, clean connectors with appropriate fiber cleaning tools prior to connection, avoid excessive bending of the fiber near the attenuator, and store unused attenuators in protective caps. Use this 5 dB attenuator when measured receiver levels exceed device specifications or when testing and calibrating multimode systems at 850 nm.