Laser Safety Information and Guidelines
Chapter 41
Laser and LED Safety Guidelines and
Warnings
Laser Safety Information and Guidelines 475
Eye Safety Guidelines 477
Class 1M Laser Product Warning 480
Laser Beam Warning 480
Radiation from Open Port Apertures Warning 480
Laser Safety Information and Guidelines
The HD equipment uses lasers as fiber-optic transmitter sources. These lasers are
inherently safe unless mishandled. The equipment meets the specifications for a hazard
level 1M product and a Class 1M Laser product, even if a fiber-optic transmitter is
changed to Forced On during installation or testing operations (21 CFR 1040.10 and
1040.11, IEC 60825-1:2014 Ed. 3.0, and IEC 60825-2:2004+A1:2006+A2:2010
compliant). To change a laser or transmitter to Forced On means that the laser or
transmitter is set to forced on mode.
Keep in mind that
l Under normal operating conditions, no human access to hazardous laser radiation is
possible because the equipment operates as a closed system.
l During operation, laser aperture terminations feed into fiber connector receptacles that
have a removable protective plug.
l All laser circuit packs operate in a controlled environment.
The accessible laser radiation at the connectors that an end user can open is not
hazardous for the unprotected eye (hazard level 1M). This is true provided that the laser
safety mechanisms are activated and use no optical instruments, which may focus the
laser beam.
In compliance with Class 1M laser safety requirements, the lasers of some traffic
modules are controlled by an automatic laser shutdown (ALS) mechanism and an
automatic restart procedure (ARP). The ALS mechanism reduces the optical output
power of the network transmitters in the event of a broken network fiber or an opened
connector. The ARP causes the laser to automatically after the disruption is corrected.
Optical power that launches from an amplifier module into the transmission fiber can be
higher than the Class 1M hazard level specified in the IEC 60825-
475 FSP 3000R7 High-Density Subshelf Guide - R17.2 - Issue:B
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