Universitat Politècnica de Catalunya - UPC

Homodyne receiver with post-processing for optical communications

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

Summary of the technology

In high bit rate optical transmission, the use of a coherent homodyne receiver will largely increase the communication capacity and enhance the transmission performances. The proposed receiver is potentially large scale integrable, thus being useful for access network transceivers, and other applications which require low-cost and high performance receivers.

The Challenge

is to design a coherent receiver that can be implemented with simple elements and can be cost competitive to conventional systems, even for Fiber-to-the-Home access networks.

The Technology


The proposed homodyne coherent receiver has two main parts: the first is a coherent balanced photo-receiver with added clock-synchronous phase switched (0-90º) local oscillator laser. The second part is an electronic post-processing performing the signal differential demodulation and a synchronous combination of the I&Q orthogonal components. This electronic post-processing can be implemented in both ways, analog and digital operations.
The local laser does not need to be phase-coherent with the incoming optical carrier, although an automatic wavelength controller is convenient to maintain the two wavelengths close each other. The local laser is directly modulated with the recovered clock signal.

Current stage of development


Experimental prototype and tests passed. Further information can be found at ECOC'07, paper 7.2.5, Berlin, Sept. 2007; and OSA Optics Letters, vol. 34, no. 4, Feb. 2009.

Applications and Target Market


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

Innovative advantages


Reduces the optical channel spacing from 50 GHz to few GHz, enabling the allocation of a high number of WDM channels (> x10) in a single fiber.
Highly tolerant to phase noise, allowing the use of standard DFB lasers.
Avoids the use of the complex optical 90º hybrid.
Low cost implementation, photonically integrable.
Allows the use of advanced modulation formats, as xPSK.
Increased bandwidth x distance reach Improved dynamic margin when used as PON receiver. Ideal for long-reach PONs.

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
  • Optics
  • Fibre Optics
  • Communications
  • Commercial Communications
  • Telephone Related
  • Facsimile Transmission
  • Data Communications
  • Satellite Microwave Communications
  • Other Communications Related
  • homodyne receiver
  • post-processing

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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