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.
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]
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]
