Optical attenuator CBO SFA21BK9 Singlemode LC Simplex 9 dB

Optical attenuator CBO SFA21BK9 Singlemode LC Simplex 9 dB is a compact, passive inline device that provides a fixed 9 dB reduction of optical power for singlemode fiber links. Designed with an LC simplex connector, it fits standard LC ports and is intended to balance power levels between transmitters and receivers, protect sensitive receiver inputs from overload, and support testing and commissioning tasks in fiber optic networks.

Advantages

The attenuator offers stable, repeatable attenuation without requiring power or configuration and maintains low insertion loss and back reflection suitable for singlemode systems. Its LC simplex interface ensures simple plug-and-play installation in existing patch panels and transceiver ports. The compact housing and passive design reduce points of failure and simplify inventory for installation and test engineers.

Suitable for

• Balancing optical power between singlemode transmitters and receivers
• Preventing receiver saturation in high-power links
• Field testing and laboratory calibration of fiber links and transceivers
• Temporary insertion during network commissioning or maintenance

Key specifications

• Attenuation: fixed 9 dB
• Fiber type: singlemode
• Connector type: LC simplex
• Design: inline, passive (no external power required)
• Typical return loss: compatible with singlemode communication requirements
• Form factor: compact inline adapter for patch cords and transceivers

How to use

Insert the LC simplex connector of the attenuator between the transmitting or receiving device and the fiber patch cord or transceiver port. Ensure connectors are clean before mating to avoid contamination-related loss. The device is polarity-preserving and does not require configuration; once inserted it will reduce the optical power by the specified 9 dB continuously. Remove and store the attenuator in protective caps when not in use to protect connectors.

Recommendations

Use the attenuator when measured received power exceeds the receiver’s maximum input level or during test procedures to simulate longer fiber runs. For laboratory or production environments, verify optical power levels with a calibrated power meter after insertion. Avoid using the same attenuator in multimode links; select singlemode attenuators for singlemode systems to ensure correct optical performance.