New Invention: Increased capacity in telecom networks

30 April 2019

The technology available to licence is a new technique for using higher order Hermite-Gaus (HG) modes to increase the channel capacity in telecommunication networks via HG mode selective multiplexing. The bandwidth of telecommunication networks can consequently be brought up to the theoretical maximum for a particular time-frequency resource.
As the device proposed operates noise-free, the invention is expected to be of use in applications.

High capacity telecommunications using multiple modes

Devices and methods for high capacity telecommunications have been developed along with the advancement of internet technology. In order to increase the data transfer rate for the available bandwidth, telecommunication signals are transmitted as an encoded signal, with two or more modes of electromagnetic radiation typically encoded and transmitted together. Dividing the capacity of the data transfer medium into multiple modes may be achieved by using intensity orthogonal states. Conventional detectors are able to separate multiple modes of electromagnetic radiation that have been multiplexed and transmitted in this way.

Existing telecommunications methods using multiple modes are not able to increase the data transfer rate much further, owing to maximal use of the phase space for such intensity orthogonal modes. Alongside the advent of the age of the Internet of Things (IoT) and artificial intelligence (AI), novel devices and methods which increase the data transfer rate further are strongly desired in order to obtain higher telecommunications capacity.

Novel devices and methods for separating multiple modes

Researchers at the University of Oxford have found novel devices and methods for de-multiplexing two modes of co-propagating electromagnetic radiation, wherein the two modes of electromagnetic radiation are orthogonal to each other. These devices and methods are configured such that when the two co-propagating modes of electromagnetic radiation and time-dependent control field are incidents at the same time in the volume, the time-dependent control field causes one of the two co-propagating modes of electromagnetic radiation to be selected and the volume to accept this one of the two modes of electromagnetic radiation onto a mode of the volume.

We believe the main advantages of the Oxford devices and methods are:

  • Spatially and/or temporally separating the two modes of electromagnetic radiation
  • The density of data encoded increased compared to intensity quasi-orthogonal modes which are not optimal for packing the time-frequency space
  • Compatible with current dense wavelength division multiplexing (DWDM) technologies

Patent protection

A patent has been filed which covers this technology. Oxford University Innovation is interested in talking to potential partners to aid in the commercialisation of these new devices and methods.