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High performance mode adapters based on segmented SPE:LiNbO3 waveguides.

Davide Castaldini1, Paolo Bassi, Pierre Aschieri

  • 1Dipartimento di Elettronica Informatica e Sistemistica, University of Bologna, Viale del Risorgimento 2, I 40136 Bologna, Italy.

Optics Express
|November 13, 2009
PubMed
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A novel mode adapter enhances optical power transfer into multimode waveguides. This new device improves coupling efficiency and tolerances compared to existing solutions, validated by theory and experiments.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Efficiently launching optical power into the fundamental mode of multimode waveguides is crucial for optical communication and sensing.
  • Existing mode adapters often suffer from limitations in coupling efficiency and tolerance.

Purpose of the Study:

  • To introduce and validate a new mode adapter design for improved optical power launching into multimode waveguides.
  • To enhance coupling efficiency, broaden coupling tolerances, and increase transmitted power.

Main Methods:

  • Theoretical analysis using Coupled Mode Theory (CMT).
  • Experimental validation using Soft Proton Exchanged (SPE) waveguides in Lithium Niobate (LiNbO3).
  • Measurements conducted at a wavelength of 840 nm.

Main Results:

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  • The proposed mode adapter demonstrates significantly improved performance over previous designs.
  • Experimental results show excellent agreement with theoretical predictions.
  • Key performance metrics like coupling efficiency and tolerance are substantially enhanced.

Conclusions:

  • The novel mode adapter offers a more efficient and robust solution for fundamental mode excitation in multimode waveguides.
  • This advancement has potential applications in integrated optics and optical systems requiring precise light manipulation.