Optical core:
Multimode fibre = 50 or 62.5 microns
Single mode fibre = 9 microns
Fibre cladding:
125 microns diameter
Fibre coating:
250 microns diameter
External jacket:
Kevlar buffer:
Adds strength to the cable
May be a jacket around the fibre cladding, or more likely, a strip along
the cable