This is definitely not a most common transceiver, which is the point of all the commentary.

I'd refuse to buy this thing unless there was some national security reason for doing so, and then there would have to be interlocks on the room to de-energize it when anyone entered.

Disclaimer: I recommend you don't look at lasers as a standard practice.

For more context, an SFP+ 10G LR 10km module is Class 1 (completely harmless during normal use).

Same with a 100G LR4 type module.

The ZR type modules that run 100+km are also Class 1.

Pretty much any optical module you plug into a router or a switch is Class 1.

Where you should definitely be cautious is:

- Around optical amplifiers, where things can get into Class 2 and 3.

- DWDM setups where each module may be a Class 1, but the sum of their light adds up into something harmful.

They are class-1 only because the system is designed to not have any light visible during normal operation. Interlocks can be the only difference between a class-1 and a class-4 laser.