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Related Concept Videos

Lossless Lines01:23

Lossless Lines

556
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
556

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Related Experiment Video

Updated: Jan 17, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Ultra-low loss optical delay lines based on silicon nitride SWG technology.

Mauricio Tosi, Marvin C Bustillos, Hao Sun

    Optics Express
    |September 23, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Compact optical delay lines using silicon nitride subwavelength gratings offer tunable delays with low loss. This advancement is crucial for microwave photonics and optical signal processing.

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    Area of Science:

    • Photonics
    • Materials Science
    • Integrated Optics

    Background:

    • Optical delay lines are critical components in microwave photonics and optical signal processing.
    • Existing silicon-based solutions face limitations in insertion loss and compactness.

    Purpose of the Study:

    • To design, optimize, and demonstrate compact optical delay lines.
    • To leverage silicon nitride and subwavelength grating (SWG) structures for improved performance.

    Main Methods:

    • Utilized silicon nitride platform for low-loss waveguides.
    • Designed and optimized SWG tapers and bends.
    • Fabricated and characterized optical delay lines.

    Main Results:

    • Achieved low loss for SWG tapers (0.04 dB) and bends (0.82 dB).
    • Demonstrated a tunable group delay by adjusting the SWG duty cycle.
    • Fabricated delay lines exhibit 1.6 dB/cm loss, outperforming silicon-based devices.

    Conclusions:

    • Silicon nitride SWG structures enable high-performance, compact optical delay lines.
    • The tunable delay mechanism offers flexibility for photonic integrated circuits.
    • This technology presents a promising alternative for advanced optical signal processing.