My apologies for not sending this to the group originally. Others may have interest.
Regards, Peter L. Tarver, PE Homologation Engineering Nortel Networks ptar...@nortelnetworks.com > -----Original Message----- > From: Tarver, Peter [SC1:4N02:EXCH] > Sent: Thursday, May 25, 2000 1:16 PM > To: 'Dave Wilson' > Subject: RE: Laser Classification > > > Dave - > > Laser classifications for safety is based on what you can get > out of the device, not typical ratings, and are most often > for continuous wave (CW) operation. Per 21CFR, S1040.10, > ranges of outputs for Class III-B for 1550nm are anything > greater than Class I (from Table I) and less than Class IV > (based on the upper limit for Class III-B in Table III-B). > > Assuming CW operation (which is probably what the > classification is based on), > > 0.79 mW < Class III-B > 0.5 W > > Regards, > > Peter L. Tarver, PE > Homologation Engineering > Nortel Networks > ptar...@nortelnetworks.com > > > -----Original Message----- > From: Dave Wilson [mailto:dwil...@alidian.com] > > Group, > > We manufacture a product for use in an Optical Fiber > Communication System > which incorporates several laser devices, and I'm somewhat > puzzled by the > classification stated on some of the manufacturer's data sheets. > > For one application, both our primary device and the alternative we're > looking at list their devices as Class IIIb (US), although > the first has a > declared max. optical tx power of +3.5dBm and the alternative > is +8.0dBm > max. My understanding is that for wavelengths at 1550nm, the > class IIIb > range starts at +9.3dBm (8.5mW). > > On the label reproductions in the data sheets, the primary > source states 2mW > max while the alternative states 10mW max. > > What am I missing? > > Thanks in advance, > > Dave Wilson > Senior Compliance Engineer > Alidian Networks Inc. > Tel: 408-273-4787 > Fax: 408-273-4800 > >
