44
HOMS
+
OP
+
and OHDS
+
OP
+
Installation and Operation Manual
Appendix A: Laser Safety Guidelines
Laser Safety
Optical fiber telecommunication systems use semiconductor laser
transmitters that emit infrared light that is normally not visible to the
human eye. Although a conventional laser produces a small beam of
light, the power density is very high, and it can cause damage to your
eyes.
If a beam of laser light enters the eye, the eye magnifies and focuses the
energy on the retina. The energy that reaches the retina can be as much
as 100,000 times more than at the cornea and, as a result, it can burn the
retina.
Laser transmission products are classified in four major groups (Class
1, 2, 3, and 4), according to their emissions and potential for causing
injury. Fiber optic transmitter modules in this series are designated
Class 1.
Precautions for Enclosed Systems
In its normal operating mode, an optical fiber communication system is
totally enclosed and presents no risk of eye injury. However, if the fiber
optic cables that interconnect various components of an optical fiber
disconnect or break, you may be exposed to laser emissions. Also,
technicians may be exposed to laser emissions during installation and
servicing.
Unlike some other laser designs, semiconductor lasers have a highly
divergent beam that decreases rapidly with distance. The greater the
distance, the less energy will enter the eye, and the less potential risk for
eye injury.
WARNING
Use of controls, adjustments, and procedures other than
those specified in this document may result in hazardous
laser radiation exposure.
WARNING
Eye damage may occur if an optical instrument such as a
microscope, magnifying glass, or eye loupe is used to stare
at the energized fiber end.
