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    This study demonstrates successful off-planar integration of wavelength division demultiplexers in optical circuits. Achieved precise wavelength selection for distinct ports, advancing compact optical integration.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Optical Engineering

    Background:

    • Wavelength Division Multiplexing (WDM) is crucial for optical communication.
    • Achieving compact and efficient integrated optical devices remains a challenge.
    • Off-planar integration offers potential for increased device density and functionality.

    Purpose of the Study:

    • To design, simulate, and analyze an off-planar integrated circuit with two wavelength division demultiplexers.
    • To demonstrate the feasibility of off-planar integration for complex optical devices.
    • To achieve precise wavelength selection for different output ports.

    Main Methods:

    • Utilized the finite-difference time-domain (FDTD) method for detailed simulation.
    • Designed an off-planar integrated circuit architecture.
    • Analyzed transmission properties and wavelength selectivity.

    Main Results:

    • Successfully designed and simulated an off-planar integrated circuit.
    • Demonstrated wavelength selection at specific ports (0.404[c/a] at B2, 0.389[c/a] at B3, 0.394[c/a] at B4) by parameter adjustment.
    • Achieved critical off-planar integration between two complex optical devices.

    Conclusions:

    • The proposed off-planar integrated circuit with wavelength division demultiplexers is feasible.
    • Parameter adjustment allows for controlled wavelength selection, enabling device customization.
    • This work significantly advances the field of all-optical integrated circuits, particularly in achieving compact integration.