Laser Safety Precautions For Enclosed Systems; Laser Safety Precautions For Unenclosed Systems - Lucent Technologies 300584935 Manual De Uso

Laser Safety Precautions for Enclosed Systems

Laser Safety Precautions for Unenclosed Systems

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beam, the irradiance (power density) decreases rapidly with distance. The greater
the distance, the less energy will enter the eye, and the less potential risk for eye
injury.
Inadvertently viewing an unterminated fiber or damaged fiber with the unaided
eye at distances greater than 5 to 6 inches normally will not cause eye injury pro-
vided the power in the fiber is less than a few milliwatts at the shorter wave-
lengths and a few tens of milliwatts at the longer 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.
!
CAUTION:
Use of controls, adjustments, and procedures other than those specified in
this guide may result in hazardous laser radiation exposure. In the U.S., con-
sult ANSI Z136.2, American National Standard for Safe Use of Lasers. Outside
the U.S., consult IEC-60825, Safety of Laser Products, for guidance on the
safe use of optical fiber optic communication systems in the workplace.
Under normal operating conditions, optical fiber telecommunication systems are
completely enclosed; nonetheless, the following precautions shall be observed:
1. Because of the potential for eye damage, technicians should not stare into
optical connectors or broken fibers.
2. Under no circumstance shall laser/fiber optic operations be performed by a
technician before satisfactorily completing an approved training course.
3. Since viewing laser emissions directly in excess of Class I/1 limits with an
optical instrument such as an eye loupe greatly increases the risk of eye dam-
age, appropriate labels must appear in plain view, in close proximity to the
optical port on the protective housing/access panel of the terminal equip-
ment.
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, mainte-
nance and restoration. Avoid exposing the eye to emissions from untermi-
nated, energized optical connectors at close distances. Laser modules associ-
ated with the optical ports of laser circuit packs are typically recessed, which
limits the exposure distance. Snap Connector (SC) optical port plugs, Auto-
matic Power Reduction (APR), and Automatic Power Shut Down (APSD) are
engineering controls that are also used to limit the emissions. However, tech-
nicians removing or replacing laser circuit packs should not stare or look
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Safety Guidelines