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Compact multimode interference couplers with arbitrary power splitting ratio.

David J Y Feng1, T S Lay

  • 1Institute of Electro-Optical Engineering, National Sun Yat-Sen University,70 Lien-Hai Road, Kaohsiung 804, Taiwan. juiyangfeng@gmail.com

Optics Express
|June 12, 2008
PubMed
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Researchers created novel 2x2 waveguide couplers with tunable power splitting ratios using unequal width waveguides and MMI sections. These low-loss devices simplify photonic integrated circuit design.

Area of Science:

  • Photonics
  • Integrated Optics
  • Waveguide Devices

Background:

  • 2x2 waveguide couplers are fundamental components in photonic integrated circuits (PICs).
  • Achieving arbitrary power splitting ratios with simple, low-loss designs remains a challenge.

Purpose of the Study:

  • To demonstrate a novel method for fabricating 2x2 waveguide couplers with arbitrary power splitting ratios.
  • To present a design that offers simple geometry and low optical loss.

Main Methods:

  • Interconnecting a pair of unequal width waveguides.
  • Utilizing these waveguides as a phase-tuning section.
  • Integrating this section between two short multimode interference (MMI) sections.

Main Results:

Related Experiment Videos

  • Successfully obtained 2x2 waveguide couplers with arbitrary power splitting ratios.
  • The proposed couplers exhibit simple geometric structures.
  • The devices demonstrate low insertion loss.

Conclusions:

  • The developed technique provides a new pathway for designing versatile waveguide-based PICs.
  • These couplers offer enhanced flexibility for optical signal manipulation.
  • The simple and low-loss nature of these devices is advantageous for practical applications.