Non-orthogonal optical multicarrier access based on filter bank and SCMA

Area of Science:

• Optical communications
• Signal processing
• Multiple access techniques

Background:

• Non-orthogonal multiple access (NOMA) systems are crucial for enhancing spectral efficiency in optical networks.
• Existing multicarrier techniques face challenges with frequency offsets and spectral efficiency limitations.
• Sparse Code Multiple Access (SCMA) offers a promising approach for NOMA but requires efficient multicarrier integration.

Purpose of the Study:

• To propose and validate a novel non-orthogonal optical multicarrier access system.
• To leverage Filter Bank Multicarrier (FBMC) with SCMA for improved performance.
• To demonstrate the feasibility of the proposed system in a realistic optical fiber link.

Main Methods:

• Development of a non-orthogonal optical multicarrier system integrating Filter Bank Multicarrier (FBMC) and Sparse Code Multiple Access (SCMA).
• Experimental setup of a 73.68 Gb/s FBMC-SCMA system.
• Transmission over a 60 km single-mode fiber link.
• Comparative analysis with Fast Fourier Transform (FFT)-based multicarrier systems.

Main Results:

• Successful demonstration of a 73.68 Gb/s FBMC-SCMA system over a 60 km fiber link.
• The proposed system exhibits enhanced spectral efficiency compared to traditional methods.
• The system shows improved tolerance to frequency offsets, a key advantage for optical access networks.

Conclusions:

• The proposed FBMC-SCMA system is a feasible and effective solution for non-orthogonal optical multicarrier access.
• This novel approach significantly enhances spectral efficiency and frequency offset resilience.
• The experimental validation confirms the practical applicability of the system for future optical communication networks.