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Polymer multimode waveguide bend based on a multilayered Eaton lens.

S Hadi Badri, H Rasooli Saghai, Hadi Soofi

    Applied Optics
    |September 11, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a compact polymeric multimode waveguide bend using a truncated Eaton lens. The innovative design achieves low bend losses for TM modes, crucial for miniaturizing integrated optical devices.

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    Area of Science:

    • Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Reducing the size of integrated optical components requires smaller bending radii in waveguides.
    • Low-index-contrast waveguides present challenges in achieving tight bends without significant signal loss.

    Purpose of the Study:

    • To design and implement a compact waveguide bend with a reduced bending radius.
    • To improve the performance and reduce the footprint of polymeric multimode waveguide bends.

    Main Methods:

    • Utilizing an Eaton lens design for the waveguide bend.
    • Employing ray-tracing calculations to truncate the Eaton lens for optimized performance.
    • Implementing a concentric cylindrical multilayer structure for the waveguide bend.

    Main Results:

    • A waveguide bend with an 18.4 μm radius was successfully designed and implemented.
    • Achieved average bend losses of 0.69 dB for TM0 and 0.87 dB for TM1 modes in the C-band.
    • Demonstrated bend loss below 1 dB across a broad bandwidth (1520-1675 nm) for both modes.

    Conclusions:

    • The truncated Eaton lens effectively reduces the bending radius and footprint of polymeric multimode waveguides.
    • The designed waveguide bend offers low-loss performance, suitable for compact integrated optical circuits.
    • This approach is vital for advancing miniaturization in photonic integrated circuits.