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A reconfigurable architecture for continuously variable optical slow-wave delay lines.

F Morichetti, A Melloni, A Breda

    Optics Express
    |June 25, 2009
    PubMed
    Summary
    This summary is machine-generated.

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    A new optical architecture uses slow-wave ring resonators for variable optical delay lines. This design offers a continuously tunable delay with reduced footprint and low insertion loss for high-speed signals.

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Waveguide Devices

    Background:

    • Variable optical delay lines are crucial for optical signal processing and telecommunications.
    • Existing designs often face limitations in tunability, footprint, or complexity.

    Purpose of the Study:

    • To propose and demonstrate a novel reconfigurable architecture for continuously variable optical delay lines.
    • To leverage slow-wave propagation in integrated optical ring resonators for enhanced performance.

    Main Methods:

    • A hybrid approach combining discrete digital delay from a coupled resonator slow-wave structure with continuous analog delay from a cascaded ring-resonator phase-shifter.
    • Utilizing a reflective configuration for robust and compact device design.
    • Fabrication of proof-of-concept devices using silicon oxynitride waveguides with thermal activation.

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    Main Results:

    • Demonstration of continuously variable optical delay from 0 to 800 ps (2-bit fractional delay) on a 2.5 Gbit/s NRZ signal.
    • Achieved low insertion loss (< 8 dB) and a significantly reduced device footprint (< 5 mm2).
    • Validation of performance in both spectral and time domains.

    Conclusions:

    • The proposed architecture offers a compact, efficient, and reconfigurable solution for variable optical delay lines.
    • The integrated optical approach based on slow-wave resonators provides a promising platform for future optical signal processing applications.