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Appendix A
Laser Safety Guidelines
Precautions for Unenclosed Systems
Label
Inspecting and Cleaning Fiber Optic Connections
During service, maintenance, or restoration, an optical fiber telecommunication system is
considered unenclosed. Under these conditions, follow the practices described below.
CAUTION!
Only authorized, trained personnel shall be permitted to do service, maintenance,
and restoration.
1
Avoid exposing the eye to emissions from unterminated, energized optical connectors at
close distances.
2
Ensure that only authorized, trained personnel use optical test equipment during
installation or servicing.
3
Turn off all laser sources before scanning a fiber with an optical test set.
4
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.
The label shown in
Figure A-1A-1
CLASS 1
LASER PRODUCT
Figure A-1 Label for Class 1 Laser Products
When connecting fibers, ensure that you do not touch the end of the fiber, or allow it to
become dirty. Small amounts of microscopic dust or other contaminants can seriously
impair or disable a fiber optic network. If you touch the end of a fiber prior to connecting it,
or otherwise allow it to become dirty, you must carefully inspect and clean the connection.
Table A-1
lists some typical contaminants of a fiber optic connection.
Table A-1 Typical Contaminants
Contaminant
Dust particle, 1 micron
Dust particle, 9 microns
Human hair
is applicable to Class 1 laser products.
Comments
Can block up to 1% of the light transmission, creating a
loss of 0.05 dB
Although microscopic, the particle can completely block
the fiber core
Typically 50 to 75 microns in diameter
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