Attenuator BlueOptics SFA23BK7 7 dB Red ST Connector

The BlueOptics SFA23BK7 7 dB Red ST Connector fiber optic attenuator reduces optical signal power by 7 dB for single-mode (9/125 µm) links. Designed for use with G.652.D fibers across the 1270–1610 nm wavelength range, this ST/PC simplex attenuator uses a zirconia ceramic ferrule and a flame-retardant LSZH jacket. It is intended to lower signal level where transmit power is too high for the receiver or where precise link power balancing is required on short optical runs.

Advantages

This attenuator provides a defined 7 dB insertion loss with low input loss and high return loss, minimizing reflections and preserving signal integrity. Manufactured with branded single-mode fiber and industry-standard ST/PC connectors, it offers reliable mechanical endurance and compatibility with common network equipment. The LSZH jacket reduces smoke and prevents halogen emissions in case of fire, and each unit is factory-tested with interferometer and OTDR measurements and supplied with a measurement protocol.

Suitable for

• Attenuating excess optical power in single-mode fiber links
• Balancing transmit power between active units and receivers
• Short-distance fiber runs where transmitter output is high
• Laboratory testing and field maintenance where a fixed 7 dB attenuation is required
• Installations requiring ST/PC simplex connectors

Key specifications

• Attenuation: 7 dB (fixed)
• Fiber type: single-mode 9/125 µm (G.652.D)
• Wavelength range: 1270–1610 nm
• Connector type: ST/PC simplex
• Ferrule material: zirconia ceramic
• Operating temperature: -40 °C to +75 °C
• Jacket: low-smoke zero-halogen (LSZH)
• Return loss: high (factory optimized, polish dependent)
• Durability: up to ~1500 mating cycles (connector dependent)

How to use

Install the BlueOptics SFA23BK7 by inserting the ST connector into the equipment or patch panel receptacle until it latches. Connect the other end of the link to the transmitter or receiver as required; the attenuator is simplex and provides a fixed 7 dB reduction in forward signal power. Ensure cleanliness of connector endfaces before mating to avoid increased insertion loss or back reflections. Use the included measurement protocol to verify insertion and return loss after installation.

Recommendations

For reliable performance, clean connector endfaces with appropriate fiber cleaning tools before each use and avoid excessive bending of the fiber near the attenuator. Select fixed attenuators of the required attenuation value to match receiver sensitivity and system power budget. Verify link power with an optical power meter and, if needed, confirm reflectance and trace with OTDR measurements.