A.M. Velázquez-Benítez

Activity: Hosting a visitor typesHosting an academic visitorScientific


The current information and network traffic all over the world has surprisingly grown over the recent years, being favoured by the progress in electronics and informatics. This problem demands solutions in communication systems capable of handling such immense amount of data. Optical communications has offered solutions for this purpose at a global scale in recent decades due to the use of optical fibers. Different techniques using single-mode fibers (SMFs) have been explored to increase data transmission in a sole optical fibre, such as wavelength division multiplexing (WDM), time division multiplexing (TDM), polarisation division multiplexing (PDM), and modulation of phase and quadrature of optical signals. However, due to of the non-linear Shannon limitation of SMFs and the high cost of equipment and devices, expansion of actual SMF based systems is not a feasible option. For this reason, approaches using multimode fibers (MMFs) are being proposed to overcome the impending capacity crunch in optical transmission systems.

The progress of SDM reside in the development of few-mode fibres and multimode components. Key components are the multiplexers and demultiplexers to link single-mode to multimode devices. Previous methods for the generation of spatial modes were based on bulk phase masks or integrated devices for a direct excitation of the modes in multimode fibers. Another solution developed in recent years, based on optical waveguides, are the all-fibre mode multiplexers or also called photonic lanterns (PLs). The techniques used in the development of specially tailored mode multiplexers and multimode amplifiers can also be applied to fabricating interposers for minimising loses in the coupling from an integrated Photonic chip to other chips or from Photonic chip to the optical transmission fibers.

The aim of this visitor grant is to jointly perform research on the development of high performance and advanced mode multiplexers and fibre interposers to enable low loss coupling into few-mode and multi-mode transmission fibers. The work will focus on three main areas: (i) the design and fabrication of high performance, higher order mode multiplexers for different number of modes (e.g. 10, 15 or 30 spatial fiber modes), (ii) to develop reliable and repeatable means of performing characterisation of the mode multiplexers for determining the quality of the generated modes for the fabrication process and (iii) finally to address the integration of the mode multiplexers to additional fibres or other photonic integrated elements in a low-loss manner whilst maintaining the high capacity transmission capability.
Period6 Oct 2018
Visiting fromUniversidad Nacional Autónoma de México (Mexico)
Visitor degreePh.D
Degree of RecognitionInternational


  • Space Division Multiplexing
  • Fiber optic devices
  • Fiber processing
  • Splicers