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12 mode, WDM, MIMO-free orbital angular momentum transmission
Optics Express
|August 19, 2018
Summary
This study demonstrates simultaneous transmission of 12 orbital angular momentum (OAM) modes over 1.2 km fiber, achieving error rates below the FEC limit. Inter-modal crosstalk was identified as the main limitation, suggesting improvements for future optical communication systems.
Area of Science:
- Optical Communications
- Fiber Optics
- Mode Division Multiplexing
Background:
- Orbital Angular Momentum (OAM) multiplexing offers a promising approach to increase fiber optic communication capacity.
- Existing OAM systems often require complex Multiple-Input Multiple-Output (MIMO) processing, limiting practical implementation.
- Air-core fibers present an alternative transmission medium with potentially lower inter-modal crosstalk.
Purpose of the Study:
- To demonstrate MIMO-free transmission of a high number of OAM modes over a significant distance.
- To evaluate the WDM compatibility and performance of an OAM-based optical communication system.
- To analyze the factors limiting system performance and propose mitigation strategies.
Main Methods:
- Simultaneous transmission of 12 OAM modes over a 1.2 km air-core fiber.
- Integration with Wavelength Division Multiplexing (WDM) using 60 channels spaced at 25 GHz.
- Transmission of 10 GBaud Quadrature Phase-Shift Keying (QPSK) signals.
- Bit error rate (BER) measurements to evaluate system performance.
Main Results:
- Successful MIMO-free transmission of 12 OAM modes was achieved.
- The system demonstrated WDM compatibility with dense channel spacing.
- Measured BERs were below the soft Forward Error Correction (FEC) limit.
- Inter-modal crosstalk was identified as the primary performance-limiting factor.
Conclusions:
- MIMO-free OAM transmission is feasible over air-core fibers.
- The system shows potential for high-capacity optical networks.
- Reducing inter-modal crosstalk through improved multiplexer/de-multiplexer design is crucial for enhanced performance.
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