MIL-DTL-83526C
3.10.1 Insertion loss. When measured in accordance with 4.8.1, the maximum per channel insertion
loss under all conditions shall be 1.5 dB for 100 µm core fibers, 1.8 dB for 62.5 µm core fibers and 2.0 dB
for 50 µm core fibers.
3.10.2 Discontinuities. When measured in accordance with 4.8.2, no discontinuity shall occur. A
discontinuity is considered to be a reduction of strength of 0.5 dB or more for a duration of 50
microseconds (µs) or more.
3.10.3 Analog modulation. When tested in accordance with 4.8.3, the peak-to-peak analog modulation,
band pass limited to between 4 hertz (Hz) and 40 kilohertz (kHz), shall be not more than one percent of
the steady state signal level.
3.10.4 Crosstalk. The signal power level of passive channel(s) shall be below the signal on the active
channel by at least the amount shown in table I when tested in accordance with 4.8.4.
TABLE I. Crosstalk reduction values for a given number of channels.
Independent signal channels
Reduction
2
50 dB
3
53 dB
4 or 5
56 dB
6 or 9
58 dB
10 or more
60 dB
3.10.5 Change in optical transmittance. When tested in accordance with 4.8.5, the optical
transmittance shall not degrade by more than 0.5 dB.
3.10.6 Return loss. When measured in accordance with 4.8.6, the return loss of a standard polish
multimode or single mode optical terminus shall not be greater than 37 dB. The return loss of an
enhanced polish single mode optical terminus shall be not less than 40 dB.
3.10.7 Ambient light susceptibility. When tested in accordance with 4.8.7, the optical
power of the light from the optical ports (after accounting for cable and optical junction losses between the
device and the detector) shall be less than 70 dBm.
3.11 Physical requirements.
3.11.1 Size. When examined in accordance with 4.9.1, the dimensions and dimensional tolerances for
these connectors, backshells, and accessories shall be as specified (see 3.1).
3.11.2 Weight. When tested in accordance with 4.9.2, the weight of the connectors, backshells and
accessories shall be as specified (see 3.1).
3.11.3 Color. The external color of the connector shall be as specified in the acquisition document (see
6.2) in accordance with this paragraph. The preferred colors are as specified (see 3.1). All background
colors shall be nonreflective (see 4.9.3).
3.11.4 Identification marking. Marking characters shall be a minimum of 2.0 mm in height. When
tested in accordance with 4.9.4, the connectors, backshells and accessories shall be marked as specified
in 3.11.4.1, 3.11.4.2, or as specified (see 3.1). All marking characters in any face of the connector,
backshell, or accessory shall be identifiable. The connector shall also be marked with a yellow band and
the phrase "Fiber-Optics" as specified (see 3.1).
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