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 no

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.