One of the big advantages to polymer optical fiber is in the isolation it can give you in any design. Engineers go to great lengths for galvanic isolations solutions.
POF eliminates any pathway for common-mode noise and in most cases this is a very economical solution. Over the last decade prices for transceivers have dropped significantly along with modern technologies for connector-less solutions like the Optolock® from Firecomms. With these easy-to-use solutions plastic optical fiber can almost completely eliminate ground loops and noise issues. The standard fiber optic cable usually 2.2 mm in diameter can lay alongside high-voltage power cables without concern for cross talk.
These POF cables are also used in high-voltage areas or where lightning strikes are a problem. They are also sometimes used in isolating POF cameras or security equipment