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Related Concept Videos

Lossless Lines01:23

Lossless Lines

124
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
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Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
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Transmission Line Design Considerations01:23

Transmission Line Design Considerations

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

88
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
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Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
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Ultralow-loss optical interconnect enabled by topological unidirectional guided resonance.

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We developed ultralow-loss grating couplers using unidirectional guided resonances (UGRs). This breakthrough significantly improves energy efficiency for optical interconnects, enabling large-scale photonic integration.

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Area of Science:

  • Photonics
  • Optoelectronics
  • Materials Science

Background:

  • Grating couplers are essential for connecting photonic chips to external devices.
  • Current grating couplers suffer from low energy efficiency, limiting large-scale photonic integration.

Purpose of the Study:

  • To develop ultralow-loss grating couplers.
  • To enhance energy efficiency in optical interconnects.
  • To overcome limitations in current photonic integration technologies.

Main Methods:

  • Utilizing unidirectional guided resonances (UGRs) to suppress downward radiation.
  • Engineering grating dispersion.
  • Apodizing grating geometry.
  • Experimental realization and characterization of the grating coupler.

Main Results:

  • Achieved a record-low grating coupler loss of -0.34 dB.
  • Demonstrated a 1-dB bandwidth exceeding 30 nm at 1550 nm.
  • Realized an optic via with a loss of only -0.94 dB.

Conclusions:

  • Unidirectional guided resonances offer a systematic approach to achieving energy-efficient optical interconnects.
  • The developed grating couplers pave the way for large-scale photonic integration.
  • This method is applicable to various grating geometries.