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Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
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Writing Bragg Gratings in Multicore Fibers
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Orbital angular momentum (OAM) conversion and multicasting using N-core supermode fiber.

Guang-Hao Shao1, Shao-Cheng Yan1, Wei Luo1

  • 1College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.

Scientific Reports
|April 23, 2017
PubMed
Summary

We demonstrate a new method for converting and multicasting orbital angular momentum (OAM) states using N-core supermode fiber (NCSF). This technique achieves high conversion efficiency and low crosstalk, showing promise for future optical communications.

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Area of Science:

  • Optics and Photonics
  • Optical Communications

Background:

  • Orbital angular momentum (OAM) multiplexing offers a promising approach to increase fiber optic communication capacity.
  • Efficient conversion and multicasting of OAM states are crucial for practical OAM-based communication systems.

Purpose of the Study:

  • To propose and numerically demonstrate a novel scheme for OAM state conversion and multicasting.
  • To investigate the feasibility of using N-core supermode fiber (NCSF) for these OAM manipulations.

Main Methods:

  • Numerical simulation of OAM state conversion and multicasting in a designed N-core supermode fiber.
  • Analysis of conversion efficiency (CE) and crosstalk based on fiber structure and external conditions.

Main Results:

  • Achieved ~37% CE for OAM conversion in a 6-core fiber at telecom bands.
  • Demonstrated dynamic control of CE via fiber stretching or refractive index adjustment.
  • Realized OAM multicasting with crosstalk below -30 dB between channels.

Conclusions:

  • The proposed NCSF-based system enables efficient OAM conversion and multicasting.
  • The system is compatible with existing optical fiber infrastructure.
  • This technology holds potential for future high-capacity optical communication systems.