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Angular Momentum Compensation and Sorting of Optical Modes in Optical Fiber

Ghorbani, Fatemeh | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56676 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Bahrampour, Alireza; Farman, Farnaz
  7. Abstract:
  8. Electromagnetic field modes have several degrees of freedom, including polarization, orbital angular momentum, and radial order, which can be described by orthogonal modes. By using all the degrees of freedom in communication, the channel capacity can be increased dramatically. With the aim of increasing the capacity and correcting the errors created along the optical fiber, two important issues have been addressed in this thesis. First, the states propagated in the fiber may be disrupted by many unwanted factors and may not be transmitted correctly. Therefore, measures should be taken to minimize the impact of these factors as much as possible or to compensate for their effects. In the first problem, it has been shown that the most important changes inside the fiber do not change the coupling value of different degrees of freedom in the fiber. Also, in the following, a device that can control all the degrees of freedom of the modes inside the fiber is proposed. In free space, various methods have been proposed to sort different modes, while this work has been done less in optical fiber. In the second problem, an all-fiber setup is proposed to separate different optical fiber modes based on polarization and orbital angular momentum degrees of freedom. In this setup, a number of cascaded Mach-Zehnder interferometers have been used, which a specific phase difference is placed between the arms of each interferometer
  9. Keywords:
  10. Orbital Angular Momentum ; Polarization Controller ; Mode Coupling Approximation ; Mach-Zehnder Interferometer ; Channel Capacity ; Measurement ; Sorting Optical Modes

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