Attenuator BlueOptics SFA23BK5 5 dB Red ST Connector

The BlueOptics SFA23BK5 is a 5 dB inline fiber optic attenuator with an ST/PC simplex connector, designed to reduce optical signal power in single-mode (9/125 µm) fiber links. It is intended for use across the typical single-mode wavelength window and is supplied in a red housing. The attenuator uses a ceramic (zirconia) ferrule for connector reliability and is tested for input loss and return loss to provide predictable performance on short links or where transmitter power must be reduced to match receiver sensitivity.

Advantages

This attenuator provides a defined 5 dB attenuation level to prevent receiver overload on short-distance or high-power single-mode links. The ST/PC connector interface and ceramic ferrule support stable fiber alignment and durability through repeated matings. The product is factory-tested for insertion loss and return loss, and the housing color (red) helps quick identification during installation and maintenance.

Suitable for

• Reducing optical power on short single-mode fiber runs
• Telecommunication and data links using ST/PC connectors
• Laboratory or field setups where controlled attenuation is required
• Systems using G.652.D single-mode fiber

Key specifications

• Attenuation: 5 dB nominal
• Connector type: ST/PC simplex
• Fiber type: single-mode (9/125 µm)
• Wavelength range: suitable for common single-mode wavelengths (approx. 1270–1610 nm)
• Ferrule material: zirconia ceramic
• Housing color: red
• Operating temperature range: designed for extended industrial range (typical -40 °C to +75 °C)
• Compliance: manufactured to industry norms and low-smoke zero-halogen jacket for reduced smoke emission

How to use

Install the attenuator inline between two ST/PC connectors by inserting the male ST plug into the attenuator and then connecting the attenuator’s ST end to the mating receptacle or patch cable. Ensure connectors and fiber endfaces are clean before connection to avoid contamination-related loss. Verify system power levels after installation with an optical power meter to confirm the effective 5 dB reduction and to ensure the receiver operates within its acceptable input range.

Recommendations

Use the attenuator with clean, undamaged connectors and avoid excessive bending or mechanical stress on the fiber. For repeated installations, verify endface condition and mating cycles; the ceramic ferrule supports many matings but proper handling extends service life. If different attenuation values or connector types are required, select the corresponding model to match system requirements.