Based on this product's specifications, here are some alternatives and similar models
Optical Fiber Inline Attenuator CBO SFA21BK15 Singlemode 15 dB
Summary description:
Inline optical fiber attenuator CBO SFA21BK15 provides fixed 15 dB attenuation for singlemode fiber links. Designed for insertion into patchcords or fiber lines, it helps manage signal levels, prevent receiver overload and optimise link performance. Compact, passive device suitable for testing, telecom, datacenter and fibre-optic network maintenance.