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Related Experiment Video

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Design and Fabrication of an Optical Fiber Made of Water
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Efficient fiber coupler for vertical silicon slot waveguides.

Haishan Sun1, Antao Chen, Attila Szep

  • 1Applied Physics Laboratory, University of Washington, Seattle, Washington 98105, USA.

Optics Express
|January 7, 2010
PubMed
Summary

This study presents a novel mode size converter that significantly improves fiber optic coupling to silicon slot waveguides. The device reduces coupling loss by up to 8 dB, enhancing optical communication efficiency.

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Area of Science:

  • Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Efficient fiber coupling is crucial for integrated photonic circuits.
  • Silicon slot waveguides offer unique optical properties but face coupling challenges.

Purpose of the Study:

  • To propose and demonstrate a mode size converter for efficient fiber coupling to silicon slot waveguides.
  • To reduce optical coupling losses for both TE and TM modes.

Main Methods:

  • Design and optimization of inverted lateral tapers and an overlaid low-index waveguide using computer simulations.
  • Fabrication of the converter on a silicon-on-insulator wafer utilizing combined electron beam and photolithography.

Main Results:

  • Optimized taper length and tip width parameters.
  • Successful fabrication of the mode size converter.
  • Measured reduction in coupling loss: 8 dB for TE mode and 5.2 dB for TM mode to standard single mode optical fiber.

Conclusions:

  • The demonstrated mode size converter effectively reduces fiber coupling loss to silicon slot waveguides.
  • The device shows significant performance improvements for both TE and TM polarizations.
  • This technology holds promise for advancing integrated photonic devices and optical communication systems.