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Scaling information pathways in optical fibers by topological confinement
Zelin Ma1, Poul Kristensen2, Siddharth Ramachandran1
1Boston University, Boston, MA 02215, USA.
Science (New York, N.Y.)
|April 20, 2023
Summary
Researchers demonstrate a new optical fiber light guidance method using orbital angular momentum. This approach enables high-capacity data transmission with reduced signal loss and crosstalk, paving the way for future networks.
Area of Science:
- Optics and Photonics
- Information Technology
Background:
- Optical fiber capacity is limited by mode mixing, hindering progress in data transmission and quantum networks.
- Current methods struggle to scale spatial mode counts efficiently.
Purpose of the Study:
- To explore an alternative light guidance method for enhanced spatial mode-count scalability in optical fibers.
- To overcome the limitations of perturbative mode mixing for high-capacity communication.
Main Methods:
- Utilizing light's orbital angular momentum to create a centrifugal barrier for self-guidance.
- Transmitting light in a conventionally forbidden regime to minimize mode mixing.
Main Results:
- Achieved kilometer-length transmission of approximately 50 low-loss modes.
- Demonstrated crosstalk as low as -45 decibels/kilometer.
- Obtained mode areas of approximately 800 square micrometers over a 130-nanometer spectral window.
Conclusions:
- The novel light-guidance regime effectively curtails mode mixing.
- This method offers a promising solution for increasing information content per photon in classical and quantum networks.
- Enables significant advancements in optical fiber capacity and energy efficiency.
