MIL-PRF-49291D
1.2.4 Size. The size designation is defined by the diameters of the optical core and cladding in
micrometers (um).
Size I.
4.0 - 8.5 um (Range of nominal mode field diameter at 1550 ± 20 nanometers (nm))/125
µm.
Size II.
8.5 - 10 um (Range of nominal mode field diameter at 1310 ± 20 nanometers (nm))/125
µm.
Size III.
50/125 µm
Size IV.
62.5/125 µm
Size V.
100/140 µm
Size VI.
200/230 µm
Size VII.
400/430 µm
1.2.5 Wavelength. The wavelength designation is defined by the primary wavelengths of operation of
the fiber.
A.
850 nm.
B.
850 and 1300 nm.
C.
1300 nm.
D.
1300 and 1550 nm.
E.
1550 nm.
1.3 Part or Identifying Number (PIN). See PIN construction below. Additional manufacturer's
marking is allowed.
PIN construction:
M
49291 /
X - XXX
Military designation
Basic optical fiber specification number
Optical fiber specification sheet number
Two or three digit alpha-numeric
PIN example:
M49291/6-04S would indicate:
- This Military specification
- Specification sheet 6 (Fiber, Optical, Type I, Class I, Size IV, Composition A,
Wavelength B, Radiation Resistant (Metric))
- 250 +/-15 um coating diameter, space qualified
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification.
This section does not include documents cited in other sections of this specification or recommended for
additional information or as examples. While every effort has been made to ensure the completeness of
this list, document users are cautioned that they must meet all specified requirements documents cited in
sections 3 and 4 of this specification, whether or not they are listed.
2.2 Government documents.
2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and
handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the
issues of these documents are those cited in the solicitation or contract.
2
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