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MIL-PRF-28876 Connectors, Fiber Optic, Circular, Plug And Receptacle Style, Multiple Removable Termini, General Specification ForThis specification covers the performance requirements for circular, plug and receptacle style, multiple removable termini, fiber optic connectors that are for Department of Defense applications and that are compatible with multiple transmission element cables. Fiber optic connectors specified herein cover a family of general purpose, interconnection hardware providing a variety of compatible optical coupling arrangements. Connector parts specified within this specification include connector shells, connector inserts, connector insert retention nuts, connector backshells, and connector dust caps.

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MIL-PRF-28876E
TABLE I. Insertion loss.
Fiber Type
Terminus
Fiber
Initial
Insertion
(MIL-PRF-
(MIL-PRF-
style
Insertion
loss
49291)
29504)
loss (dB)
verification
(dB)
50/125
2.0
/1
or /12
2.0
/3
50/125
2.0
/2
or /13
2.0
/3
1.5
/1
or /12
100/140
1.5
/4
1.5
/2
or /13
100/140
1.5
/4
1.25
/14
62.5/125
0.75
/6
1.25
/15
62.5/125
0.75
/6
1.25
/14
0.75
/7
SM
1.25
/15
0.75
/7
SM
3.11.2  Discontinuities.  When measured in accordance with 4.6.3.2, no
discontinuity shall occur.  For multimode termini, a discontinuity is
considered to be a reduction of optical transmittance of 0.5 dB or more for a
duration of 50 microseconds or more.  For single mode termini, a discontinuity
is considered to be a reduction of optical transmittance of 0.5 dB or more for
a duration of 50 microseconds or more (during vibration) or 100 milliseconds
or more (during shock).
3.11.3  Crosstalk.  When connectors with 3 or more channels are tested in
accordance with 4.6.3.3, the signal power levels, or sum of levels of the
passive channel or channels, shall be below the signal level of the active
channel by at least 60 dB.
3.11.4  Change in optical transmittance.  When tested in accordance with
4.6.3.4, the change in optical transmittance shall be less than 0.5 dB.
3.11.5  Return loss.  When measured in accordance with 4.6.3.5, the return
loss of a standard polish multimode or single mode optical terminus shall be
not less than 30 dB.  The return loss of an enhanced polish single mode
optical terminus shall be not less than 40 dB.
3.12
Functional requirements.
3.12.1  Insert retention radial strength.  When tested in accordance with
4.6.4.1, connector inserts shall withstand the clockwise and counterclockwise
radial torque specified in table II for a minimum period of one minute.  No
rotational displacement shall be observed between the inserts and their shell
body during or after the test exposure.
TABLE II.
Insert retention radial strength.
Maximum radial
Connector
torque
shell size
(inch pounds (N-m))
11
15 (1.7)
13
20 (2.3)
15
25 (2.8)
23
30 (3.4)
11



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