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Related Concept Videos

Cascaded Op Amps01:16

Cascaded Op Amps

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...

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Related Experiment Video

Updated: Jun 22, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Electrically tunable fast light at THz bandwidth using cascaded semiconductor optical amplifiers.

Bala Pesala, Forrest Sedgwick, Alexander V Uskov

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

    Ultra-fast non-linear optics achieve a 2 ps pulse advance using semiconductor optical amplifiers (SOAs). This pulse advance is tunable by adjusting the current, and a single SOA loop emulates multiple cascaded SOAs.

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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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    Related Experiment Videos

    Last Updated: Jun 22, 2026

    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
    11:08

    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

    Published on: November 30, 2012

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    Area of Science:

    • Optics and Photonics
    • Non-linear Optics
    • Semiconductor Devices

    Background:

    • Ultra-fast optical pulses are crucial for high-speed communication and advanced spectroscopy.
    • Semiconductor Optical Amplifiers (SOAs) offer a compact and efficient platform for manipulating light pulses.

    Purpose of the Study:

    • To demonstrate significant pulse advance using non-linear processes in SOAs.
    • To investigate the tunability of pulse advance by controlling SOA current.
    • To propose a novel experimental scheme for emulating cascaded SOA systems.

    Main Methods:

    • Utilizing ultra-fast non-linear optical processes within two SOAs arranged in series.
    • Precisely controlling the current supplied to the SOAs to tune the pulse advance.
    • Developing an experimental setup employing a single SOA in a feedback loop.

    Main Results:

    • Achieved a pulse advance of 2 picoseconds (ps) for a 600 femtosecond (fs) pulse.
    • Demonstrated continuous tunability of the 3.3-pulse advance by varying the applied current.
    • Successfully emulated the behavior of multiple cascaded SOAs using a single SOA configuration.

    Conclusions:

    • Ultra-fast non-linear processes in SOAs enable substantial and tunable pulse advance.
    • The proposed single SOA loop scheme provides an efficient method to study cascaded SOA dynamics.
    • This research has implications for advanced optical signal processing and high-speed optical systems.