ServeTheHome reviewed the FS 400Gbase-SR8 400GbE QSFP-DD Optical Transceiver
A quote from the article:
We take a look at the FS.com 400Gbase-SR8 optics in the company's new QSFP-DD optical transceiver module in a 64-port 400GbE switchFS 400Gbase-SR8 400GbE QSFP-DD Optical Transceiver Review