Based on this product's specifications, here are some alternatives and similar models
Optical attenuator CBO SFA21BK9 Singlemode LC Simplex 9 dB
Summary description:
Inline optical attenuator CBO SFA21BK9 provides a fixed 9 dB signal attenuation for singlemode fiber links. With an LC simplex connector it fits standard LC ports and is intended for use in fiber optic networks, testing, or power-level adjustment between transmitters and receivers. Compact, passive device requiring no power, it helps prevent receiver overload and ensures correct signal levels for reliable data transmission.