FIBER OPTICS
FIBER OPTIC ASSEMBLIES
fiber optic assemblies

FIBER OPTIC ASSEMBLIES

Fiber optic assemblies include such devices as electro-optical components, star couplers, attenuators, repeaters, etc. The optical fibers in these devices consist of the coated fiber (core, cladding, coating), and differ from fiber optic cables, which are constructed with buffer layers, strength members and an outer jacket.

Optical fiber offers size and weight savings over optical cable, but additional attention must be paid to the protection of the fiber.

See Section 10.01 "Fiber Optics, General Requirements", for common accept/reject criteria.

fiber configuration endface

PREFERRED

CONNECTOR/FIBER CONFIGURATION

The connector is properly assembled. clean and damage-free. The connector and fiber strain-relief device(s) are properly installed, straight, tight and damage-free.

NASA-STD-8739.5 [11.3]

ACCEPTABLE

ENDFACE

The endface is clean and free from cracks, scratches, edge chips, hackles, pits and other anomalies. The fiber is concentric inthe ferrule, and the epoxy ring is even.

NASA-STD-8739.5 [11.3.1.c]

fusion splice buffer shrinkage

ACCEPTABLE

FUSION SPLICE

The splice is perfectly aligned. Fusion zone is of uniform diameter, with no bubbles, contamination or boudary layer evident.

NASA-STD-8739.5 [9.2.2.a]

UNACCEPTABLE

BUFFER SHRINKAGE

Shrinkage of the buffer shall be cause for rejection.

NASA-STD-8739.5 [11.5.3.d]

NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002
Revision:
Revision Date:
Book:
10
Section:
10.02
Page:
1




FIBER OPTICS
FIBER OPTIC ASSEMBLIES (cont.)
epoxy deposits on face of fiber optic improper fiber alignment

UNACCEPTABLE

EPOXY

Epoxy deposits on the core, cladding or ferrule are rejectable. The deposits may be fixable by repolishing.

NASA-STD-8739.5 [10.2.7.e]

UNACCEPTABLE

IMPROPER FIBER ALIGNMENT

Axial alignment of the fiber to the connector shall be maintained with 5 cm (2 in.) of the entry/exit from the connector body, to minimize stress on the termination and to minimize macrobend effects.

Best Workmanship Practice

improper strain relief

UNACCEPTABLE

IMPROPER STRAIN RELIEF

The strain relief shall be positioned and attached per engineering documentation. As depicted, the strain relief boot has not been installed.

NASA-STD-8739.5 [10.2.7.f]











NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002
Revision:
Revision Date:
Book:
10
Section:
10.02
Page:
2





Click here for printable .pdf file for Section 10.02 Fiber Optics Fiber Optic Assemblies click here to download Adobe Reader Click here to email the author of the Pictorial Reference Handbook
Need a printed copy?
(May take a while to load.)

Requires Adobe Reader.
Need Adobe Reader?
Click here to download.
Questions? Suggestions?