First US patent for CESNET

Prague, January 15, 2014: United States Patent and Trademark Office (USPTO) found Device for multicast of optical signals in Internet and other networks as a new and useful invention and issued patent US 8,582,967 on Nov 12th 2013. The patent grants CESNET Association exclusive rights for manufacturing, sales and import of these devices into US territory. Device is already protected in the Czech Republic by patent no. 300811 issued on August 12th 2009 by the Industrial Property Office and is available on the market as a CzechLight Multicast switch (CLM).

The device enables dynamical multicast of input optical signals within the whole telecommunication transmission spectrum. It is designed especially for the distribution of extremely high speed data flows as it works completely independently on the signal speed or modulation; and for signals requiring precise timing because its delay is constant and independent of a number of multicast and switched signals.

The equipment belongs to the CzechLight family of advanced photonic devices for optical signals transmission and processing that has been developed by the CESNET Association. Alongside the above mentioned CLM there are other CzechLight devices commercially available, including the following ones:

  • Optical amplifiers CLA
  • Optical switches CLS
  • Variable multiplexers for terminal applications CL-VMUX
  • Reconfigurable optical add/drop multiplexers CL-ROADM

The Association uses the set of equipment for deploying a CEF (Customer Empowered Fibre) and “fibre to the user” concepts. The technology also enables sharing the optical fibres capacity and at the same time empowers CESNET offer further advanced services such as lambda services and photonic services (see more information on the concepts and services).

The CESNET Association looks for other parties interested in the CzechLight family equipment manufacturing and deployment. The name CZECHLIGHT is also covered by the registered trademark.

The CESNET Association was founded by Czech universities and the Academy of Sciences of the Czech Republic in 1996. It is engaged in research and development in information and communication technologies and builds and develops the CESNET national e-infrastructure for research and education. The Association develops open photonic system CzechLight within frame of these activities. With its research activities and accomplishments, CESNET represents the Czech Republic in international projects, most notably the pan-European GÉANT network building project and grid projects (

Press release, January 15, 2014

Last change: 27.1.2014