Universitat Politècnica de Catalunya - UPC

Efficient technology to reduce interference in passive optical networks

Posted by Universitat Politècnica de Catalunya - UPCResponsive · Patents for licensing · Spain

Summary of the technology

A new method for reducing interference in passive optical networks has been developed and patented. The technology allows the use of low cost lasers whose wavelength does not to be pre-selected, and assures a high speed communication of hundreds of users. Partners to further develop the system and/ or to establish commercial agreements along with technical cooperation are sought.

The Challenge

Is to assure proper communication of a high number of users or homes (hundreds) at high bit rate making good use of the optical spectrum, using standard low cost lasers at the home.

The Technology


This present technique enables the use of any laser whose wavelength does not have to be pre-selected, so it can be randomly taken by the customer.
It consists of a centralized intelligent algorithm for controlling wavelength and the subcarrier in the OLT (Optical Line Terminal), which controls and commands the ONU (Optical Network Unit) wavelength mechanisms, in order to avoid possible interference while maintaining low total cost of the network.
It combines statistical multiplexing with fine thermal and current tuning, that is simply done in a standard DFB (Distributed Feedback Bragg) or VCSEL (Vertical Cavity Surface Emiting Lasers) laser, and fast adjustment of ONU RF modulation bands.

Current stage of development


Prototype and validity tests passed. Experimental results published at: 37th European Conference on Optical Communication (ECOC), paper Tu.5.C.2, 2011, Geneva

Applications and Target Market


Broadband Telecom System Vendors Broadband Telecom Operators Telecom laser manufacturers Broadband Optical Communications networks: access, metropolitan, transport.
Fiber-to-the-Home networks Next Generation - Passive Optical Networks (NG-PON): WDM, udWDM, OFDM.

Innovative advantages


Use of low cost lasers sources in a WDM-PON, with non-preselected wavelength.
Hundreds of ONUs in the PON sharing the splitter-based infrastructure.
Compatibility with GPON infrastructure.
Specially suited for Ultra-Dense-WDM and OFDM.
Optical Frequency demodulation (oFSK) Intrinsic remodulation for up-stream transmission Optical Amplification High speed (e.g. 10 GBit/s)

Intellectual property status

Granted Patent
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Technology available for licensing with technical cooperation Patent Status Priority application

Technology Owner

Universitat Politècnica de Catalunya - UPC

Technology Transfer Office

Related keywords

  • Electronics, IT and Telecomms
  • Broadband Technologies
  • Telecommunications, Networking
  • Industrial manufacturing, Material and Transport Technologies
  • Industrial Manufacture
  • Optical Materials
  • Optical Networks and Systems
  • Laser Related
  • Communications
  • Commercial Communications
  • Facsimile Transmission
  • Data Communications
  • Fibre Optics
  • broadband

About Universitat Politècnica de Catalunya - UPC

Technology Transfer Office from Spain

The Universitat Politècnica de Catalunya - BarcelonaTech is a public institution dedicated to higher education and research in the fields of engineering, architecture and science, which contributes its knowledge and expertise in order to increase scientific output, transfer its results to society and provide a network of scientific and technical state-of-the-art facilities and technology valorization services that place us at the leading edge of innovation and economic development.

The UPC has established itself as a driver of innovation and is the technology partner of choice for companies and organizations with which it develops projects and builds partnerships. A role borne out by the numerous agreements and research projects that have been set in motion by groups, organizations and laboratories; the creation of new technology-based companies; the generation and exploitation of patents, and the scientific and technical services UPC makes available to its environment in order to generate progress and employment.

The Technology Transfer Office (SGI) is responsible of Designing, coordinating and implementing research valorisation strategies, carrying out the protection policy of the research results, marketing these results through license contracts and designing and setting up the University's enterprise creation model in order to transfer the results of the research to the market, protect and commercialize these results, promote the culture of entrepreneurship and innovation, and create technology-based companies within the UPC environment.

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