Related Experiment Video
Updated: Jun 27, 2025
00:07
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.5K
Robust Free-Space Optical Communication Utilizing Polarization for the Advancement of Quantum Communication
Nicholas Savino1, Jacob Leamer1, Ravi Saripalli2
1Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA.
Entropy (Basel, Switzerland)
|April 26, 2024
Summary
Polarization of light in free-space optical communication is preserved despite underwater bubble turbulence. This finding offers potential improvements for polarization-based FSO systems.
Area of Science:
- Optical communication
- Photonics
- Turbulence effects on light propagation
Background:
- Free-space optical (FSO) communication systems face signal distortion and loss due to non-uniform media.
- Polarization properties of light are sensitive to environmental disturbances.
- Underwater and atmospheric turbulence pose significant challenges for reliable FSO links.
Purpose of the Study:
- To investigate the impact of underwater bubble-induced turbulence on the polarization state of light in FSO communication.
- To assess the preservation of the state of polarization (SOP) and degree of polarization (DOP) under turbulent conditions.
- To compare experimental findings with simulation models of underwater and atmospheric turbulence.
Main Methods:
- Experimental demonstration using a novel, low-cost setup to simulate underwater FSO communication.
- Computational simulation modeling the effects of underwater bubbles and atmospheric turbulence on light polarization.
- Comparative analysis of experimental results and simulation data.
Main Results:
- The state of polarization (SOP) and degree of polarization (DOP) of light are shown to be preserved when propagating through underwater bubbles.
- Experimental data aligns with simulation results, validating the models used.
- The proposed experimental setup is effective for long-distance atmospheric or underwater testing.
Conclusions:
- Underwater bubble turbulence does not significantly degrade the polarization properties of light in FSO systems.
- Polarization-based FSO communication schemes can be potentially improved based on these findings.
- The developed experimental approach offers a cost-effective method for FSO channel characterization.
Related Concept Videos
01:29Potential Due to a Polarized Object
397
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
397
01:31Dielectric Polarization in a Capacitor
4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
01:30Propagation Speed of Electromagnetic Waves
3.4K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.4K
01:31Energy Stored In A Coaxial Cable
1.4K
A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
1.4K
01:28Induced Electric Dipoles
4.2K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.2K