Based on this product's specifications, here are some alternatives and similar models
SFP Transceiver LevelOne 1.25Gbps 10km 1310nm
Summary description:
The LevelOne 1.25Gbps Single-mode SFP Transceiver offers a maximum data transfer rate of 1250 Mbit/s over a distance of 10km. It operates at a wavelength of 1310nm and is compatible with GSW-2453 and GVT-4000 products. This Class 1 Laser certified device ensures reliable performance with an input voltage of 3.5V and a maximum current of 0.3A. Compact dimensions of 13.5mm x 55.5mm x 8.5mm make it easy to integrate into various networking setups.