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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

491
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
491

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Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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Method for in-depth characterization of electro-optic phase modulators.

Bassem Arar, Max Schiemangk, Hans Wenzel

    Applied Optics
    |February 4, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A novel optical domain method accurately measures phase modulator performance, including non-linearities. This technique quantifies modulation efficiency and residual amplitude modulation for GaAs devices, yielding electro-optic coefficients.

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    Area of Science:

    • Optoelectronics
    • Semiconductor devices
    • Nonlinear optics

    Background:

    • Accurate characterization of phase modulators is crucial for optical communication systems.
    • Residual amplitude modulation (RAM) and non-linearities affect modulator performance.
    • Existing methods for measuring these parameters can be complex or limited.

    Purpose of the Study:

    • To present a flexible and accurate method for measuring phase modulator efficiency and RAM, including non-linear effects.
    • To demonstrate the method's application to GaAs chip-based phase modulators.
    • To determine key electro-optic coefficients from the measurements.

    Main Methods:

    • Optical domain demodulation using a heterodyne interferometer.
    • Analysis of In-phase (I) and Quadrature (Q) components of the RF beat note signal.
    • Measurement of phase modulation efficiency and RAM for TE and TM modes.

    Main Results:

    • The method successfully measured modulation efficiency and RAM for a GaAs phase modulator at 1064 nm.
    • Non-linear effects were accounted for in the measurements.
    • Linear and quadratic electro-optic coefficients were estimated for a P-p-n-N GaAs/AlGaAs double heterostructure.

    Conclusions:

    • The presented heterodyne interferometry method offers a flexible and accurate approach for characterizing phase modulators.
    • The technique provides valuable insights into modulator performance, including non-linear behavior.
    • The derived electro-optic coefficients are essential for understanding and optimizing GaAs-based optoelectronic devices.