Ultra-broadband indoor optical wireless communication system with multimode fiber

Area of Science:

• Optical Communications
• Wireless Networking
• Fiber Optics

Background:

• Existing in-building fiber networks predominantly use multimode fiber.
• Optical wireless communication systems offer high bandwidth potential for indoor environments.
• Full-duplex communication is crucial for interactive applications.

Purpose of the Study:

• To experimentally demonstrate an ultra-broadband indoor full-duplex WDM optical wireless communication system utilizing multimode fiber.
• To evaluate the performance trade-offs of using multimode fiber in such systems.
• To compare uplink performance with single-mode fiber systems.

Main Methods:

• Implementation of a full-duplex Wavelength Division Multiplexing (WDM) optical wireless communication system.
• Integration of multimode fiber for signal distribution within the indoor environment.
• Experimental testing for error-free data transmission rates.

Main Results:

• Simultaneous error-free transmission achieved at 4x12.5 Gbps for downlink and 800 Mbps for uplink (Bit Error Rate < 10^-9).
• Multimode fiber use resulted in a ~2.4 cm reduction in the maximum error-free downlink beam footprint.
• Uplink data rates were significantly higher compared to systems using single-mode fiber.

Conclusions:

• An ultra-broadband indoor full-duplex WDM optical wireless system using multimode fiber is feasible.
• The system supports high-speed, error-free communication essential for modern indoor networks.
• Multimode fiber offers a viable solution for existing infrastructure, with notable advantages for uplink capacity.