Efficient 100-Gb/s wide multi-band RoF system using single-drive MZM with bias-controlled chirp parameter for 6 G...

Area of Science:

• Optical Communications
• Wireless Networking
• Telecommunications Infrastructure

Background:

• Mobile data traffic is rapidly increasing, driving demand for 6G networks with ultra-high data rates and low latency.
• Radio-over-fiber (RoF)-based distributed antenna systems (DAS) offer a promising solution for efficient signal transmission in dense indoor environments.
• Analog RoF systems face challenges like noise, nonlinearities, and power fading due to chromatic dispersion.

Purpose of the Study:

• To demonstrate a RoF-based DAS network capable of transmitting high-speed, multi-band signals over standard optical fiber.
• To propose and validate an efficient method for mitigating power fading in RoF systems.
• To assess the system's suitability for short-reach 6G indoor applications.

Main Methods:

• Implementation of a RoF-based DAS network transmitting a 100 Gb/s wide multi-band signal (6 × 3.11 GHz) over 7-km standard single-mode fiber.
• Mitigation of power fading by controlling the chirp parameter of a single-drive Mach-Zehnder modulator (MZM) via DC bias voltage adjustments.
• Experimental validation and analysis of system tolerance to varying transmission distances.

Main Results:

• Successful transmission of a 100 Gb/s wide multi-band signal over 7 km of C-band fiber.
• Demonstration of effective power fading mitigation using the proposed MZM chirp control method.
• Confirmation of the system's tolerance to transmission distance variations.

Conclusions:

• RoF-based DAS networks utilizing a single-drive MZM are a viable and efficient solution for short-reach 6G indoor applications.
• The proposed power fading mitigation technique enhances the performance and reliability of RoF systems.
• This approach supports the scalable infrastructure required to meet future data demands in 6G networks.