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Related Concept Videos

Effects of feedback01:24

Effects of feedback

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Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Feedback control systems01:26

Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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Phase-lead and Phase-lag Controllers01:22

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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Time and frequency -Domain Interpretation of PI Control01:27

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Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
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Proportional Integral (PI) controllers are a fundamental component in modern control systems, widely used to enhance performance and mitigate steady-state errors. They are particularly effective in applications such as automatic brightness adjustment on smartphones, where they excel at mitigating steady-state errors for step-function inputs. Unlike PD controllers, which require time-varying errors to function optimally, PI controllers leverage their integral component to address residual...
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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Multi-input signal phase stabilization in photonic processors with on-chip feedback control.

Igor A Litvin, Gökhan Elmas, Paul Kohl

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    We developed an on-chip feedback control (FBC) scheme to stabilize phase instability in multimode photonic processors. This method ensures reliable operation and high long-term stability for integrated photonic systems.

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    Area of Science:

    • Photonics
    • Quantum Information Science
    • Integrated Optics

    Background:

    • Scaling integrated photonic systems requires reconfigurability and stable output.
    • Phase instability in multimode photonic processors hinders performance.

    Purpose of the Study:

    • To address phase instability in multimode photonic processors.
    • To implement an on-chip feedback control (FBC) scheme for stabilizing multi-port input signals.

    Main Methods:

    • Theoretical analysis and simulations were performed for four input signals.
    • Experimental realization of FBC in a 4x4 Hadamard transformation.
    • Temporal output stabilization was achieved using the FBC scheme.

    Main Results:

    • The FBC scheme successfully stabilized the relative phase of multi-port inputs.
    • The processor demonstrated high long-term stability with normalized output-power drift below 0.006 per hour.
    • Experimental results aligned with theoretical predictions, confirming robust interference and coherent combining.

    Conclusions:

    • The developed FBC method enables reliable operation of reconfigurable multimode interferometers.
    • This approach is crucial for advancing quantum and classical information processing.
    • The FBC scheme is extendable to larger and more complex photonic processors.