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Related Concept Videos

Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...
Unsymmetric Bending01:18

Unsymmetric Bending

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The orientation of the...

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

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Published on: March 20, 2017

On-chip transformation optics for multimode waveguide bends.

Lucas H Gabrielli1, David Liu, Steven G Johnson

  • 1School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.

Nature Communications
|November 22, 2012
PubMed
Summary
This summary is machine-generated.

We developed a new platform for on-chip multimode devices that minimizes inter-mode coupling. This breakthrough enables compact integrated multimode optics for higher data rates in optical communication systems.

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Area of Science:

  • Photonics
  • Optical Communications
  • Integrated Photonics

Background:

  • Current optical communication systems utilize multimode fibers for various transmission distances, driven by ultra-high bandwidth needs and spatial data multiplexing.
  • Integrated photonics, dominant in telecommunications, is limited to single-mode operation due to inter-mode coupling issues in compact multimode waveguides.
  • This coupling impairs data rates and prevents modal multiplexing in on-chip applications.

Purpose of the Study:

  • To propose a novel platform for on-chip multimode devices.
  • To overcome the challenge of inter-mode coupling in compact multimode waveguides.
  • To enable integrated multimode optics for advanced optical communication systems.

Main Methods:

  • Utilizing a theoretical approach based on large-scale inverse design of transformation optics.
  • Maximizing device performance within fabrication constraints.
  • Employing grayscale lithography for fabricating an exemplary device.

Main Results:

  • Demonstration of a platform for on-chip multimode devices with minimal inter-mode coupling.
  • Fabrication of a low-crosstalk multimode waveguide bend as an exemplary device.
  • Overcoming limitations of compact routing in multimode integrated photonics.

Conclusions:

  • The proposed platform opens possibilities for integrated multimode optics.
  • This advancement can enhance data rates and enable modal multiplexing in on-chip systems.
  • The developed methods provide a pathway for designing and fabricating high-performance multimode photonic integrated circuits.