Universitat Politècnica de Catalunya - UPC

Optical communication receiver with an SQRT nonlinear equalizer

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

Summary of the technology

In a high bit rate optical transmission, the inclusion of a simple non-linear equalizer implementing the square-root mathematical function, just after the photo-detector and before the conventional electronic equalizer (FIR, MLSE, analog,..), linearizes the overall systems and highly improves the transmission performances.

The Challenge

It consists of obtaining a linear photo-receiver.

The Technology


The intrinsic square-law non-linear function of the photodiode, relating the optical field amplitude and the generated current, can be partially compensated by means of the nonlinear electrical circuit performing a square-root function after the photodiode.

The results in long distance systems, with impairments like chromatic dispersion and ASE noise, have demonstrated a substantial performance enhancement, using FIR or MLSE equalizers in a digital IM-DD, and with Radio-over-Fiber systems.
The device has been implemented with fast shottky diodes in a simple structure, with a MMIC chip with technology GaAs 0.2 um, and with Digital Signal Processor, approximating the SQRT function with low error.
An extended version implements a modified function, that incorporates the optical noise model, and completely transforms it into Gaussian statistics at the photo-receiver output.

Current stage of development


Experimental prototype and validity tests passed.

Applications and Target Market


Optical transceiver manufacturers Broadband Telecom System Integrators Optical Communication networks: transport, metropolitan, access

Innovative advantages


Increased bandwidth x distance reach Simple and very low cost implementation, specially if integrated with TIA.
Increase of chromatic dispersion tolerance, by enhancement of conventional EDC capabilities (about +30%).
Linearization of the effect of other optical impairments, like reflections, optical noise, interferences, etc.
Eye diagram symmetry and transformation of ASE chi-square statistics into Gaussian.
Reduced number of required quantization levels for ADC.
Improved dynamic margin in FTTH PON burst-mode receivers.

Intellectual property status

Granted Patent
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Technology available for licensing, transfering and technical cooperation Patent Status Granted

Technology Owner

Universitat Politècnica de Catalunya - UPC

Technology Transfer Office

Related keywords

  • Electronics, IT and Telecomms
  • Optical Materials
  • Optical Networks and Systems
  • Optical material testing
  • Optics
  • Industrial manufacturing, Material and Transport Technologies
  • Broadband Technologies
  • Telecommunications, Networking
  • Network Technology, Network Security
  • Fibre Optics
  • Communications
  • Telephone Related
  • Data Communications

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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