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Standing Waves in a Cavity01:28

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Efficient fiber-to-waveguide coupling through the vertical leakage from a microring.

Zhaolin Lu1

  • 1Microsystems Engineering, Kate Gleason College of Engineering, Rochester Institute of Technology, NY 14623, USA. zxleen@rit.edu

Optics Letters
|October 3, 2007
PubMed
Summary

This study introduces an efficient fiber-to-waveguide coupler using a microring resonator. It achieves up to 93% coupling efficiency for integrating optical fibers with semiconductor waveguides in optoelectronic circuits.

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Area of Science:

  • Optoelectronics
  • Nanophotonics
  • Materials Science

Background:

  • Efficient light coupling from optical fibers to semiconductor waveguides is crucial for integrated optoelectronic circuits.
  • Existing methods face challenges in achieving high coupling efficiency and compatibility with submicrometer waveguides.

Purpose of the Study:

  • To propose and demonstrate a novel fiber-to-waveguide coupler for efficient light transfer.
  • To enable seamless integration of single-mode fibers with submicrometer semiconductor waveguides.

Main Methods:

  • Design of a microring resonator with a specific refractive index atop a semiconductor waveguide.
  • Utilizing gradual vertical leakage from the microring for controlled light coupling.
  • Employing the three-dimensional finite-difference time-domain (3D FDTD) method for simulation and analysis.

Main Results:

  • Demonstrated coupling efficiency of up to 93%.
  • Verified the effectiveness of the microring structure for steady light coupling.
  • Showcased the potential of tapered-waveguide or microring structures for lateral-mode size conversion.

Conclusions:

  • The proposed microring-based fiber-to-waveguide coupler offers a highly efficient solution for optoelectronic integration.
  • This technology facilitates the miniaturization and enhanced performance of photonic integrated circuits.