Based on this product's specifications, here are some alternatives and similar models
Optical Fiber Attenuator CBO SFA22BK15 Singlemode 15 dB
Summary description:
CBO SFA22BK15 is a singlemode optical fiber attenuator with a fixed attenuation of 15 dB. Designed for insertion into singlemode fiber lines to reduce optical signal power, it helps prevent receiver saturation and enables proper link budgeting. Compatible with standard singlemode connectors and suitable for laboratory, telecommunication and data-center use where controlled signal reduction is required.