Needed several 400G modules for running an 8km link. When plugged them into my Arista switch, they could be well-matched and were immediately picked up by my switch. No transmission problems and the signal loss was quite low for our link. Worth to buy.

I bought these 400G modules for running a 9km network link. For such a distance, they deal great with it. The speeds are satisfying. Signal loss is quite low. The whole system is pretty stable overall. We haven't found any problems so far.

I had used FS optical modules for several years, with no quality problems. So when our team needed test modules for our first 400G switches, I placed the order without hesitation. The QSFP-DD transceiver arrived quickly with a solid package. Now, the test is going on.