Progress in the field of fiber optics depends heavily on innovation, invention, and the careful use of pretested, commercially available components. A component or device is considered to be one unit of a complete experimental diagnostic system that performs a single function and that can be used in other systems.
Robert P. Reedy,
"Unique components for photonics diagnostic systems using fiber optics", Proc. SPIE 0648, Photonics: High Bandwidth Analog Applications, (13 August 1986); doi: 10.1117/12.964530; https://doi.org/10.1117/12.964530