conditions to ensure that viscous forces do not distort the fiber during formation.
Please note that chemical vapor deposition may still be used to fabricate the
high-purity, fused silica components that make up the preform.
8.6 KEY PERFORMANCE PARAMETERS
This section introduces the important optical and physical parameters that
influence a PM fiber’s performance. It is intended to act as a practical guide to
specifying a PM fiber for any specific application. Explanations are provided
where these parameters differ from those of more conventional fibers, particu-
larly in cases in which these differences should raise practical concerns, and in
doing so, some popularly held myths are dispelled.
8.6.1 Attenuation (a)
Attenuation values for PM fibers