MIL-PRF-29504/4D
TABLE IV. Optical insertion loss performance. 1/
Termini in non-tight tolerance
Termini in tight tolerance
M38999 2/
M38999/60 and M38999/61 3/
Ferrule
Fiber
Initial
Insertion
Initial
Insertion loss
material
size
insertion
loss verification
insertion
verification
(dB) 4/
loss (dB)
(dB) 4/
(um)
loss (dB)
Single mode < 9/125
1.25
1.75
1.25
1.75
Ceramic
Single mode 9/125
0.75
1.25
0.75
1.25
Ceramic
50/125
1.50
2.00
1.00
1.50
Ceramic
62.5/125
1.00
1.50
0.75
1.25
Ceramic
62.5/125/polyimide
1.50
2.00
1.00
1.50
Ceramic
100/140
0.75
1.25
0.75
1.25
Ceramic
100/140/polyimide
1.50
2.00
1.00
1.50
Ceramic
> 100/140
1.50
2.00
1.25
1.75
Ceramic
50/125
1.50
2.00
1.25
1.75
Metal
62.5/125
1.25
1.75
1.00
1.50
Metal
62.5/125/polyimide
1.50
2.00
1.25
1.75
Metal
100/140
1.25
2.25
1.00
1.50
Metal
100/140/polyimide
1.50
2.50
1.00
1.75
Metal
200/230
1.50
2.50
1.00
1.75
Metal
1/ Optical loss performance is based on use of specified fabrication procedure.
2/ Termini in a MIL-DTL-38999 connector that is other than MIL-DTL-38999 tight tolerance series III
connector (the latter being built to specification sheets MIL-DTL-38999/60 and MIL-DTL-38999/61
specific to fiber optic applications), the former distinguished from the tight tolerance type by denoting
as the MIL-DTL-38999 non-tight tolerance connector.
3/ Termini in a MIL-DTL-38999 tight tolerance series III connector (the MIL-DTL-38999/60 and MIL-DTL-
38999/61 specific to fiber optic applications) for shell sizes 9 through 19. For shell sizes 21 through
25, use performance requirements when termini are used in a MIL-DTL-38999 non-tight tolerance
connector.
4/ Insertion loss verification is an insertion loss performed after a series of environmental tests or
mechanical tests.
Mechanical. The following mechanical tests shall be performed in the sequence listed following the
post mating durability, terminus cleaning and return loss tests, mechanical shock and vibration. 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).
9
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