Fire resistant cable having two jackets separated by porous insulating layer

An optical fiber cable, comprising:

• an outer jacket having a first inner surface and a first outer surface, the first outer surface defining an outermost surface of the optical fiber cable, and the outer jacket having first thickness between the first inner surface and the first outer surface;
• an inner jacket having a second inner surface and a second outer surface and having a second thickness between the second inner surface and the second outer surface, the inner jacket being disposed within the outer jacket;
• a porous insulating layer disposed between the second outer surface of the inner jacket and the first inner surface of the outer jacket, the porous insulating layer configured to reduce the transfer of heat to the inner jacket during combustion of the outer jacket;
• a layer of flame retardant tape disposed between the porous insulating layer and the second outer surface of the inner jacket;
• at least one optical fiber disposed within the inner jacket;
• wherein the first thickness is less than the second thickness;
• and
• wherein each of the outer jacket and the inner jacket comprise at least one flame retardant additive.