*Wireless Power Transfer – Recent Development, Applications and New Perspectives*

SDO has been in an optical network. This can be done through the construction of application-specific protocol stacks out of small reusable services [1].

**Elastic optical network (EON)**: EON accommodates dynamic changes of the optical component, such as flexible wavelength assignment, redefined optical switches and various transponders, etc. to improve system performances. It is possible to integrate EON with an IP layer easily to construct an IP-over-EON. The basic unit of switching in EON is a sub-carrier instead of the wavelength in the fixed-grid case since channels are usually composed of a variable number of sub-carriers [18].

**Software-defined optical transmission (SDOT)**: SDOT supports dynamic reconfigurability of optical components and the ability to adapt various transponders. Softwarization and intelligent control of the data plane facilitates SDOT to optimal use of the available resources, which exploits the multiple dimensions and granularities efficiently.

**Cognitive optical network (CON)**: To make more agile optical networking, a cognitive optical network has been proposed. The CON architecture enables high data rate lightpaths while compensating for a variety of dispersion impairments. CON improves the measuring parameters [e.g., optical signal-to-noise ratio (OSNR), chromatic dispersion (CD), polarization-mode dispersion (PMD), and bit error rate (BER)] while compensates the impairment and subsequently enhance the QoT in the optical network efficiently [19].
