tens of milliwatts at the far IR wavelengths. However, 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.
Laser safety precautions for enclosed systems
Under normal operating conditions, optical fiber telecommunication systems are
completely enclosed; nonetheless, the following precautions must be observed:
1. Because of the potential for eye damage, technicians should not stare into optical
connectors or broken fibers
2. Under no circumstances shall laser/fiber optic operations be performed by a
technician before the technician has satisfactorily completed an approved training
course.
3. Since direct viewing of laser emissions in excess of Class I/1 limits with an optical
instrument such as an eye loupe greatly increases the risk of eye damage,
appropriate labels must appear in plain view, in close proximity to the optical port
on the protective housing/access panel of the terminal equipment.
Laser safety precautions for unenclosed systems
During service, maintenance, or restoration, an optical fiber telecommunication system
is considered unenclosed. Under these conditions, follow these practices:
1. Only authorized, trained personnel shall be permitted to do service, maintenance
and restoration. Avoid exposing the eye to emissions from un-terminated, 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
emissions. However, technicians removing or replacing laser circuit packs should
not stare or look directly into the optical port with optical instruments or
magnifying lenses. (Normal eye wear or indirect viewing instruments such as
Find-R-Scopes are not considered magnifying lenses or optical instruments.)
2. Only authorized, trained personnel shall use optical test equipment during
installation or servicing since this equipment contains semiconductor lasers. (Some
examples of optical test equipment are Optical Time Domain Reflectometers
(OTDRs), Hand-Held Loss Test Sets.)
3. Under no circumstances shall any personnel scan a fiber with an optical test set
without verifying that all laser sources on the fiber are turned off.
4. All unauthorized personnel shall be excluded from the immediate area of the
optical fiber telecommunication systems during installation and service.
For the optical specifications please refer to the
LambdaUnite
®
MSS Applications and
Planning Guide, chapter 10, section “Transmission parameters”.
About this information product
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Lucent Technologies - Proprietary
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Issue 1, December 2005
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