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Related Concept Videos

Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

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Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
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Receiver Operating Characteristic Plot01:15

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A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
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Time-Domain Interpretation of PD Control01:07

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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
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Group Polarization01:01

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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Updated: Jan 8, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Mode vector modulation: receiver architectures and DSP algorithms for polarization tracking.

Ioannis Roudas, Aishik Biswas, Alexander Brisson

    Optics Express
    |December 19, 2025
    PubMed
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    Mode vector modulation (MVM) offers a new approach for optical interconnects in datacenters and AGI supercomputers. This method leverages spatial and polarization modes for higher bandwidth efficiency than traditional M-ary pulse amplitude modulation (M-PAM).

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    Area of Science:

    • Optical Communications
    • Data Center Networking
    • Signal Processing

    Background:

    • Hyperscale datacenters and AGI supercomputers require high-speed, scalable optical interconnects.
    • Current networks use M-ary pulse amplitude modulation (M-PAM) with direct detection (DD) over parallel fiber strands (space-division multiplexing).
    • Multicore fibers (MCFs) are proposed to reduce fiber count and simplify connectivity.

    Purpose of the Study:

    • To introduce and evaluate mode vector modulation (MVM) as a novel optical interconnect format.
    • To present new MVM direct detection (DD) receiver architectures.
    • To develop digital signal processing (DSP) algorithms for polarization tracking in MVM systems.

    Main Methods:

    • Exploiting spatial and polarization degrees of freedom in MCFs for multidimensional symbol transmission.
    • Designing and analyzing novel MVM direct detection (DD) receiver architectures.
    • Developing and evaluating blind and pilot-assisted digital signal processing (DSP) algorithms for polarization tracking.

    Main Results:

    • Several MVM DD receiver architectures were presented, balancing hardware complexity and performance.
    • A suite of DSP algorithms for polarization tracking was introduced and evaluated.
    • MVM demonstrates potential as a high-sensitivity, bandwidth-efficient alternative to M-PAM.

    Conclusions:

    • Mode vector modulation (MVM) offers a promising, bandwidth-efficient approach for future direct-detection optical interconnects.
    • The developed MVM receiver architectures and DSP algorithms enhance the practicality of this technology.
    • MVM can potentially overcome the limitations of traditional M-PAM systems in demanding computing environments.