2  ×  2 multiple-input multiple-output optical-wireless integration system based on optical independent-sideband...

Area of Science:

• Optical Communications
• Wireless Communications
• Signal Processing

Background:

• Millimeter-wave (mm-wave) communication systems offer high bandwidth potential.
• Integrating optical and wireless technologies is crucial for future high-speed networks.
• Existing methods for generating multiple mm-wave signals can be complex.

Purpose of the Study:

• To propose a novel and simple 2x2 multiple-input multiple-output (MIMO) system for optical-wireless integration.
• To demonstrate the simultaneous generation and wireless delivery of two independent mm-wave signals.
• To utilize optical independent-sideband modulation for efficient mm-wave signal generation.

Main Methods:

• Developed a 2x2 MIMO optical-wireless integration system.
• Employed optical independent-sideband modulation using an in-phase/quadrature (I/Q) modulator.
• Utilized software-based digital signal processing to drive the I/Q modulator for generating two single-sideband optical vector signals.

Main Results:

• Successfully demonstrated the simultaneous generation of two independent 40-GHz quadrature-phase-shift-keying (QPSK) wireless mm-wave signals.
• Achieved 2x2 MIMO wireless delivery of these mm-wave signals.
• Each 40-GHz QPSK signal carried up to 4-Gbaud data with a bit-error ratio below the forward-error-correction threshold.

Conclusions:

• The proposed 2x2 MIMO optical-wireless integration system enables efficient simultaneous generation of multiple mm-wave signals.
• Optical independent-sideband modulation is an effective technique for this application, replacing optical polarization multiplexing.
• The system shows promise for high-capacity wireless communication systems.