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Integrated optic wavelength demultiplexer using a coplanar grating lens.

S Ura, M Morisawa, T Suhara

    Applied Optics
    |June 22, 2010
    PubMed
    Summary

    This study introduces an integrated optic wavelength-demultiplexer (IOWD) using a grating lens for efficient wavelength separation and focusing. The device achieves low crosstalk for multiple wavelengths, simplifying optical systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Waveguide Devices

    Background:

    • Wavelength-division multiplexing (WDM) is crucial for optical communication systems.
    • Existing demultiplexers often require bulky external components.
    • There is a need for compact, integrated solutions for wavelength separation.

    Purpose of the Study:

    • To propose and demonstrate a novel integrated optic wavelength-demultiplexer (IOWD).
    • To utilize a coplanar grating lens for simultaneous wavelength separation and focusing.
    • To achieve high performance with a compact, monolithically integrated device.

    Main Methods:

    • Design and fabrication of an IOWD using a grating lens in a single-mode slab waveguide.
    • Monolithic integration of the grating lens and channel waveguides on a silicon substrate.

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  • Fabrication via a planar process, including electron-beam writing.
  • Experimental validation using single-mode laser diodes.

    • Main Results:

    • Demonstration of an IOWD capable of demultiplexing nine wavelengths (0.778–0.802 µm) with 3-nm separation.
    • Achieved crosstalk levels of less than -20 dB.
    • The device integrates focusing and demultiplexing functions, eliminating the need for external lenses.
    • Successful demonstration of the demultiplexing principle through experiments.

    Conclusions:

    • The proposed IOWD offers a compact and efficient solution for wavelength demultiplexing.
    • The grating lens approach simplifies device architecture and fabrication.
    • This integrated device has potential applications in optical communication and sensing systems.