**3. Conclusion and future perspectives**

In conclusion, this chapter described a revision of PoF, its technical principles, main elements, technologies, and the applications focusing in telecom and in utilities, developed by the author's group.

The applications for PoF have evolved over the last years mainly in terms of power availability for the load in the remote units. Many publications describe incredible dozen watts power transmitted in the SMF fiber cladding. This evolution allows applications to become more complex using PoF, such as video cameras powering, antennas powering, or PoF networks.

The increase of supplier's options for PoF devices and fibers has also been occurring and it can reduce the cost of this interesting optical fiber technique.
