Based on this product's specifications, here are some alternatives and similar models
SFP Optical Transceiver INTELLINET 1000Base-LX (LC) Single-Mode 20km, mini-GBIC, 3.3V
Summary description:
Single-port SFP optical transceiver by INTELLINET supporting Gigabit Ethernet at 1000 Mbit/s over single-mode fiber using 1000Base-LX with LC connector. MSA-compliant mini-GBIC form factor with up to 20 km reach, typical power consumption 1 W and 3.3 V input. Certified FCC Class A, CE, RoHS and IEC-60825; compact aluminium housing for use in switches, routers and media converters.