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Vertically integrated As2S3 ring resonator on LiNbO3.

Mehmet E Solmaz1, Donald B Adams, Wee C Tan

  • 1Department of Electrical and Computer Engineering, Solid-State Electronics, Photonics and Nano-EngineeringLaboratory, Texas A&M University, College Station, Texas 77843-3128, USA.

Optics Letters
|June 3, 2009
PubMed
Summary

This study introduces a novel integration of chalcogenide glass waveguides with titanium-indiffused lithium niobate (Ti:LiNbO(3)) waveguides. This breakthrough enables the creation of compact ring resonators for advanced fiber optic applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Integrated Optics

Background:

  • Titanium-diffused lithium niobate (Ti:LiNbO(3)) waveguides are crucial for high-speed electro-optic modulation in fiber optics.
  • Ti:LiNbO(3) waveguides have limitations in creating small ring resonators due to insufficient index contrast.

Purpose of the Study:

  • To overcome the limitations of Ti:LiNbO(3) for small ring resonators.
  • To demonstrate the vertical integration of chalcogenide glass waveguides with Ti:LiNbO(3) waveguides.
  • To develop a novel race-track ring resonator for optical filtering applications.

Main Methods:

  • Vertical integration of arsenic trisulfide (As(2)S(3)) glass waveguides onto Ti:LiNbO(3) substrates.
  • Design and fabrication of a race-track ring resonator with a 290.8 micrometer bend radius.

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  • Implementation of a unique taper design for efficient vertical coupling.

    • Main Results:

    • Demonstration of the first integrated arsenic trisulfide (As(2)S(3)) race-track ring resonator on a Ti:LiNbO(3) waveguide.
    • Achieved 10.6% optical coupling efficiency.
    • Measured a 2.08 dB roundtrip loss and a 25.4 GHz free-spectral range.

    Conclusions:

    • The vertical integration of As(2)S(3) waveguides offers a viable solution for creating compact ring resonators on Ti:LiNbO(3) platforms.
    • This hybrid approach enhances the capabilities of existing photonic integrated circuits.
    • The developed resonator shows promise for applications in all-pass filters and advanced optical networks.