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Writing Bragg Gratings in Multicore Fibers
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Monolithic mode-selective few-mode multicore fiber multiplexers.

Nicolas Riesen1,2, Simon Gross3, John D Love4

  • 1The Institute for Photonics and Advanced Sensing (IPAS) and School of Physical Sciences, The University of Adelaide, Adelaide, Australia. nicolas.riesen@adelaide.edu.au.

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To prevent internet capacity limits, researchers developed a novel few-mode multicore fiber multiplexer. This technology enables ultra-high capacity dense space-division multiplexing by addressing individual spatial modes in optical fibers.

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Area of Science:

  • Optical communications
  • Photonics
  • Materials science

Background:

  • Standard single-mode optical fiber capacity is nearing its limit, necessitating new technologies to meet growing internet demand.
  • Space-division multiplexing (SDM) using few-mode multicore fiber (FM-MCF) offers a potential two-orders-of-magnitude increase in data capacity.
  • Addressing individual spatial modes within FM-MCF is crucial for realizing its full capacity potential.

Purpose of the Study:

  • To develop a monolithic mode-selective multiplexer for FM-MCF.
  • To enable simultaneous addressing of multiple spatial modes across multiple cores.
  • To demonstrate a scalable solution for ultra-high capacity optical communication systems.

Main Methods:

  • Fabrication of a mode-selective multiplexer using ultrafast laser inscription on a photonic chip.
  • Operation across the S+C+L telecommunications bands.
  • Characterization of mode extinction ratios and insertion losses for multiplexed modes.

Main Results:

  • Successful realization of a compact, monolithic multiplexer for FM-MCF.
  • Simultaneous multiplexing of LP01, LP11a, and LP11b modes in a 3-mode, 4-core fiber.
  • Achieved excellent mode extinction ratios and low insertion losses across S+C+L bands.

Conclusions:

  • The developed multiplexer is a key enabling technology for practical ultra-high capacity dense space-division multiplexing.
  • The device design is scalable to accommodate more modes and cores, supporting future capacity demands.
  • This advancement addresses the impending internet capacity crunch by enhancing optical fiber data transmission.