MIL-STD-2042-6B(SH)
NOTE: Pass/fail criteria utilized for the optical return loss test must be consistent with the polishing method requirements. Standard dome polish return loss levels are to be not less than 30 dB. Enhanced dome polish return loss levels are to be not less than 40 dB.
4.4 Safety precautions. The following safety precautions apply:
a. Observe all written safety precautions given in the test procedures of this standard practice.
b. Observe all warning signs on equipment and all written safety precautions included in the equipment instruction manual.
c. The classification of a laser is based on the ability of the optical beam to cause damage to the eye. Under normal operating conditions, an optical fiber communication system (OFCS) is inherently an eye safe system; but, when an optical fiber connection is broken and optical viewing instruments are used, it is possible that hazardous energy can enter the eye. For
this reason four service group hazard classes have been devised to
indicate the degree of hazard and required hazard control measures. Refer
to ANSI Z136.2 for a full technical definition. Simplified definitions of
the service groups are as follows.
SG1 - No risk when the end of a fiber is viewed with a microscope, eye- loupe or with the unaided eye. The total output power is less than
5 mW.
SG2 - Potentially hazardous when the end of the fiber is viewed for more than 0.25 seconds for a source that emits at wavelengths between
400 nm to 700 nm. (NOTE: This wavelength range is in the visible region and is outside of the 850 nm or 1300 nm wavelength ranges used in Navy equipment.)
SG3a -Hazardous when the end of the fiber is viewed with a microscope or eye-loupe, but is not hazardous when viewed with the unaided eye. The total output power of the source is between 5 mW and 50 mW. (NOTE: Most sources used in Navy systems or test equipment have output power significantly less than 5 mW.)
SG4a -Hazardous when the end of the fiber is viewed under any condition unless protective eye wear is worn. The total output power of the source is between 50 mW and 500 mW.
The following laser safety precautions shall apply:
(1) Ensure personnel are familiar with the laser degree of hazard and the required control measures.
(2) Light generated by light emitting diodes (LED's) and laser diodes may not be visible but may still be hazardous to the unprotected eye. Never stare into the end of an optical fiber connected to an LED or laser diode and do not stare into broken, severed or disconnected optical cables.
(3) Do not view the primary beam or a specular reflection from an OFCS with an optical microscope, eye loupe or other viewing instrument. The instrument may create a hazard due to its light gathering capability.
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