25G is the common server port in modern data centers and the building block of 100G breakout. This category has SFP28 optics for multimode (SR) within the hall, and single-mode for 10, 40 and 80 km between halls or sites.
Make sure both ends use the same FEC setting; it differs per platform and is a common reason a 25G link won't come up. We code every optic for your platform, from Cisco and Arista to Mellanox/NVIDIA. Not sure which reach you need? Give us a call.