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Related Concept Videos

Three-Winding Transformers01:19

Three-Winding Transformers

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Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...
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Equivalent Circuits for Practical Transformers01:28

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The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
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Transformers01:26

Transformers

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A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
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The Ideal Transformer01:26

The Ideal Transformer

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In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
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Types Of Transformers01:16

Types Of Transformers

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Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Monolithically integrated compact 281 µm long arbitrary polarization to TE transformer.

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    This study presents a compact integrated polarization transformer. The device efficiently converts arbitrary light polarization to pure transverse electric (TE) polarization with minimal loss.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Nanophotonics

    Background:

    • Integrated photonics requires precise control over light polarization.
    • Existing polarization transformers often lack efficiency or broad bandwidth.
    • On-chip polarization manipulation is crucial for advanced optical systems.

    Purpose of the Study:

    • To introduce a novel compact building block for integrated polarization transformation.
    • To achieve efficient conversion of arbitrary polarization states to transverse electric (TE) polarization.
    • To provide improved phase control for on-chip optical signals.

    Main Methods:

    • Theoretical analysis of the polarization conversion mechanism.
    • Electromagnetic simulations to model device performance.
    • Fabrication and experimental characterization of the integrated device.

    Main Results:

    • Demonstrated efficient conversion of arbitrary input polarizations to TE polarization.
    • Achieved a low mode loss of 0.75 dB at 1.526 µm.
    • Simulations predict <0.25 dB loss over a >40 nm bandwidth.

    Conclusions:

    • The proposed building block offers a compact and efficient solution for on-chip polarization transformation.
    • The design exhibits excellent performance characteristics, including low loss and broad bandwidth.
    • This technology enables enhanced phase control in integrated photonic circuits.