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Related Experiment Video

Updated: Jun 22, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Silicon-on-insulator ultra-compact duplexer based on a diffractive grating structure.

Günther Roelkens, Dries Van Thourhout, Roel Baets

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a compact silicon-on-insulator diffractive grating for duplexing operations. This photonic integrated circuit component spatially separates 1310nm and 1490nm wavelengths, crucial for fiber-to-the-home transceivers.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Nanophotonics

    Background:

    • Duplexing operation is essential for integrated optical transceivers in fiber-to-the-home (FTTH) applications.
    • Existing solutions for wavelength separation can be bulky or complex.
    • Efficient spatial separation of 1310nm and 1490nm wavelength channels is required for FTTH systems.

    Purpose of the Study:

    • To propose and demonstrate an ultra-compact silicon-on-insulator (SOI) diffractive grating structure.
    • To achieve efficient spatial separation of two distinct wavelength bands for duplexing.
    • To enable polarization-independent operation for enhanced device robustness.

    Main Methods:

    • Design and simulation of one-dimensional (1D) and two-dimensional (2D) diffractive grating structures on SOI.
    • Fabrication of a 10μm x 10μm 1D grating structure.
    • Characterization of spatial separation, coupling efficiency, optical bandwidth, and polarization dependence.

    Main Results:

    • A 1D SOI grating structure successfully spatially separates 1310nm and 1490nm wavelength bands.
    • Achieved an average coupling efficiency of 55% and an optical bandwidth of 55-60nm.
    • Demonstrated that 1D gratings are polarization-dependent, leading to the presentation of a 2D grating for polarization-independent operation.

    Conclusions:

    • The proposed SOI diffractive grating is a key component for ultra-compact integrated optical transceivers.
    • The device enables efficient wavelength duplexing for FTTH applications.
    • A 2D grating design offers a pathway to polarization-independent performance, enhancing practical applicability.