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Laser Safety Guidelines
Laser Safety
WARNING
Use of controls, adjustments, and procedures other than those specified in this
document may result in hazardous laser radiation exposure.
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
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.
Under normal operating conditions, optical fiber telecommunication systems are completely
enclosed; nonetheless, observe the following precautions: