opticalsintai
https://www.optical-sintai.com/products/100g-qsfp28-single-mode-transceiver.html
Designed for 100G Ethernet and OTU3 links over single-mode fibers, the Sintai 100G QSFP28 single-mode optical transceivers use LWDM wavelengths (1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm) and support transmission distance up to 10km.