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Related Concept Videos

Cascaded Op Amps01:16

Cascaded Op Amps

602
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...
602

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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High-repetition-rate electro-optic frequency combs using cascaded silicon phase modulators.

Abdolkhalegh Mohammadi, Erwan Weckenmann, Alireza Geravand

    Optics Express
    |June 14, 2025
    PubMed
    Summary

    We present novel methods using cascaded silicon phase modulators to enhance electro-optic frequency combs. This approach achieves record repetition rates and improved spectral uniformity for advanced optical signal generation.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Electro-optic frequency combs are crucial for optical communications and spectroscopy.
    • Improving spectral uniformity and repetition rates of frequency combs is an ongoing challenge.
    • Silicon photonics offers a promising platform for integrated optical devices.

    Purpose of the Study:

    • To explore novel methods for improving comb line spacing and flatness in electro-optic frequency combs.
    • To investigate the influence of phase modulation nonlinearity, PN-junction transient response, and waveguide group dispersion on comb spectral symmetry.
    • To demonstrate the feasibility of achieving high repetition rates and spectral uniformity using cascaded silicon phase modulators.

    Main Methods:

    • Utilizing cascaded silicon phase modulators for electro-optic frequency comb generation.
    • Analyzing factors affecting comb spectral symmetry, including phase modulation nonlinearity and PN-junction transient response.
    • Experimentally demonstrating adjustable comb spacing up to 37.5 GHz.

    Main Results:

    • Achieved a seven-line frequency comb with 37.5 GHz spacing and 6 dB flatness.
    • Demonstrated the highest repetition rates reported for silicon modulators.
    • Confirmed the ability to fine-tune comb spectral shape for enhanced uniformity.

    Conclusions:

    • Cascaded silicon phase modulators offer a viable method for generating high-performance electro-optic frequency combs.
    • The developed techniques enable precise control over comb spacing and spectral flatness.
    • This advancement has implications for high-capacity optical signal generation and transmission.