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Appendix B
Laser Safety Guidelines
Precautions for Unenclosed Systems
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During service, maintenance, or restoration, an optical fiber telecommunication system is
considered unenclosed. Under these conditions, follow these practices:
CAUTION: Only authorized, trained personnel shall be permitted to do service,
maintenance, and restoration.
Avoid exposing the eye to emissions from unterminated, energized optical connectors at
close distances.
Laser modules associated with the optical ports of laser circuit packs are typically recessed,
which limits the exposure distance. Optical port shutters, Automatic Power Reduction
(APR), and Automatic Power Shut Down (APSD) are engineering controls that are also used
to limit the emissions. However, technicians removing or replacing laser modules should not
stare or look directly into the optical port with optical instruments or magnifying lenses.
(Normal eyewear or indirect viewing instruments such as Find-R-Scopes are not considered
magnifying lenses or optical instruments).
Ensure that only authorized, trained personnel use optical test equipment during
installation or servicing.
Turn off all laser sources before scanning a fiber with an optical test set.
Keep all unauthorized personnel away from the immediate area of the optical fiber systems
during installation and service.
For guidance on the safe use of optical fiber communication systems in the workplace,
consult ANSI Z136.2, American National Standard for Safe Use of Lasers in the U.S. or
outside the U.S., IEC-60825, Part 2.
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