Full duplex 60-GHz RoF link employing tandem single sideband modulation scheme and high spectral efficiency...

Area of Science:

• Optical Communications
• Wireless Communications
• Signal Processing

Background:

• Radio-over-Fiber (RoF) systems are crucial for integrating wireless and optical networks.
• Existing RoF systems face challenges with dispersion and spectral efficiency.
• Full duplex communication is desired for enhanced network capacity.

Purpose of the Study:

• To propose and demonstrate a full duplex 60-GHz band RoF link.
• To utilize a modified tandem single sideband (TSSB) modulation scheme with frequency doubling.
• To achieve high spectral efficiency and wavelength reuse while mitigating dispersion effects.

Main Methods:

• Implementation of a modified TSSB modulation scheme with frequency doubling.
• Experimental demonstration of single carrier 8-QAM and QPSK-OFDM signals for downlink transmission.
• Experimental demonstration of wavelength reuse with 1.25-Gb/s On-Off Keying (OOK) for uplink transmission using a reflective semiconductor optical amplifier (RSOA).

Main Results:

• No dispersion-induced fading was observed with the modified TSSB scheme.
• High spectral efficiency vector signals were utilized.
• Successful wavelength reuse was achieved for both downlink and uplink transmissions.
• No significant receiver power penalties were observed after 50-km standard single-mode fiber (SSMF) transmission for both directions.

Conclusions:

• The proposed modified TSSB modulation scheme is effective for full duplex 60-GHz band RoF systems.
• The system achieves high spectral efficiency, wavelength reuse, and robustness against dispersion.
• The demonstrated link is suitable for future high-capacity wireless and optical integrated networks.