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Related Concept Videos

Cascaded Op Amps01:16

Cascaded Op Amps

731
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
731

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Related Experiment Video

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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Integrated dispersion compensator based on cascaded silicon micro-ring resonators.

Zhanqiang Hui, Biying Xian, Dongdong Han

    Optics Express
    |August 13, 2025
    PubMed
    Summary

    A novel silicon photonic integrated circuit uses nested micro-ring resonators to achieve large negative dispersion, enabling compensation for optical signal distortion in high-speed data transmission.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science (Silicon Photonics)

    Background:

    • Integrated dispersion management is crucial for ultrafast all-optical signal processing in large-scale photonic integrated circuits (PICs).
    • Chromatic dispersion in optical fibers limits data rates and transmission distances in high-speed communication systems.

    Purpose of the Study:

    • To propose and optimize a novel integrated silicon dispersion compensator.
    • To achieve a large negative dispersion value for effective chromatic dispersion compensation.
    • To demonstrate the device's capability in compensating for dispersion in high-speed optical signals.

    Main Methods:

    • Design of a silicon dispersion compensator by cascading two dual-layer nested micro-ring resonators (MRRs).
    • Optimization of the structure using the finite-difference time-domain (FDTD) method.
    • Numerical analysis of group delay, negative dispersion, insertion loss, and footprint.

    Main Results:

    • Achieved maximum negative dispersion values of -34611.6 ps/nm at 1550 nm and -7567.1 ps/nm at 1545 nm.
    • Obtained a maximum group delay of 266.41 ps at 1550 nm.
    • Demonstrated successful compensation of cumulative chromatic dispersion for 40 Gbit/s on-off keying (OOK) signals after 100 km of single-mode fiber (SMF) with insertion loss below 0.44 dB and a compact footprint of 25 μm × 27 μm.

    Conclusions:

    • The proposed nested MRR-based dispersion compensator offers superior performance in terms of dispersion and footprint compared to existing technologies.
    • The device exhibits seamless compatibility with complementary metal-oxide-semiconductor (CMOS) technology.
    • This design holds significant potential for ultra-high-speed silicon photonic transceiver chips and related applications.