Eye protection in DWDM systems -- what threshold?

David Freedman david.freedman at uk.clara.net
Tue Jun 9 05:43:02 CDT 2009

I forget who the vendor is now, but their shelves are sealed with a door
which, when opened, turns off all the lasers on the shelf so you can
work on it, yes, a simple provisioning operation causes an outage /
protection switchover!!


Deepak Jain wrote:
> At what power level do DWDM systems become dangerous to work near (i.e. not staring into any optics, using light meters, etc)? I never see technicians on inside DWDM systems using eye protection, but I see power levels of amps going higher and higher. On a recent meter I saw almost .6mW... 
> Any pointers to a document saying 1550nm becomes dangerous at xxxx dbM?
> Thanks in advance,
> DJ

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