METRIC
MIL-PRF-49291D
20 June 2013
SUPERSEDING
MIL-PRF-49291C
14 July 1997
PERFORMANCE SPECIFICATION
FIBER, OPTICAL, (METRIC) GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers the general requirements and characteristics of optical fibers for
signal transmission. The fiber is defined as the core, cladding, and protective coatings applied during the
fiber drawing process.
1.2 Classification. The optical fibers specified herein are categorized as follows.
1.2.1 Type. The type designation is defined by the mode volume of the optical fiber.
Type I. Multimode (MM).
Type II. Single-mode (SM).
1.2.2 Class. The class designation for Type I fibers is defined by the nature of refractive index profile,
given by the profile parameter (g). The class designation for Type II fibers is determined by the nature of
their dispersion characteristics.
Type I fibers.
Class 1. Graded index:
3>g>1.
Class 2. Quasi-graded index: 10>g>3.
Class 3. Step index:
g>10.
Class 4. Other.
Type II fibers.
Class 5. Dispersion unshifted.
Class 6. Dispersion shifted.
Class 7. Dispersion flattened.
Class 8. Other.
1.2.3 Composition. The composition designation is defined by the composition of the optical fiber core
and cladding (see 6.4) as follows:
A. Glass and glass.
B. Glass and plastic.
C. Plastic and plastic.
Comments, suggestions, or questions on this document should be addressed to DLA Land and
Maritime-VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to
FiberOpticGroup@dla.mil. Since contact information can change, you may want to verify the
currency of this address information using the ASSIST Online database at https://assist.dla.mil.
AMSC N/A
FSC 6010
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