Based on this product's specifications, here are some alternatives and similar models
Optical Fiber Attenuator CBO SFA23BK10 10 dB Singlemode ST Simplex
Summary description:
Passive optical fiber attenuator CBO SFA23BK10 provides a fixed 10 dB attenuation for singlemode fiber links. It features an ST simplex connector and is used to reduce signal power between transceivers and receivers to prevent saturation and optimise link performance. Suitable for testing, lab work and field installations where controlled attenuation is required.