Plenum (OFNP - Optical Fiber Nonconductive Plenum)

Source: www.extron.com/company/article.aspx?id=decipheringapp

Fibre optic cabling is preferred for backbone cabling, particularly over large distances. But whichever type of cabling you use, cable that passes from floor-to-floor or through plenum areas must be fire-rated. Optical fibre non-conductive riser (OFNR) and/or optical fibre non-conductive plenum (OFNP) are the obvious choices here.

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40 GHz

Usually, there is a laser diode that is optically coupled to the fiber.