[115109] in North American Network Operators' Group
Re: Eye protection in DWDM systems -- what threshold?
daemon@ATHENA.MIT.EDU (Joel Jaeggli)
Tue Jun 9 01:26:48 2009
Date: Mon, 08 Jun 2009 22:25:24 -0700
From: Joel Jaeggli <joelja@bogus.com>
To: Deepak Jain <deepak@ai.net>
In-Reply-To: <D338D1613B32624285BB321A5CF3DB250CCD14F7D7@ginga.ai.net>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
There are erbium doped raman lasers with output of up to 10 watts
continuous wave, they are (obviously) class 4 devices and are considered
hazardous.
3r and 3b emitters shouldn't be directly exposed to the eye, and carry
an appropriate warnings. the 10-80km stuff should all be 1 or 1m and
does't merit the yellow triangle.
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
