Bidirectional wavelength-division-multiplexing fibre-free-space optical communications using polarisation...

Area of Science:

• Optoelectronics
• Optical Communications
• Wireless Technologies

Background:

• Growing demand for high transmission capacity in fiber backbones and last-mile communications.
• Need for integrated fiber-optic and optical wireless technologies for advanced communication systems.

Purpose of the Study:

• To develop a bidirectional wavelength-division-multiplexing fiber-free-space optical communication system.
• To enhance transmission capacity and performance for future communication networks.

Main Methods:

• Integration of polarization multiplexing with wavelength-division multiplexing.
• Utilization of a tunable optical vestigial sideband filter and vestigial sideband-four-level pulse amplitude modulation.
• Employing triplet lenses to extend the optical wireless link.

Main Results:

• Achieved a high aggregate transmission capacity of 480 Gb/s for bidirectional (downstream/upstream) transmission.
• Demonstrated low bit error rates and clear eye diagrams.
• Significantly increased transmission capacity and enhanced performance.

Conclusions:

• The developed bidirectional fiber-free-space optical communication system offers substantial potential for advanced wired-wireless communications.
• The integration of advanced multiplexing and filtering techniques enables high-capacity optical wireless links.