Phase optimization approach to control high peak-to-average power ratio in a second-order soliton-based NFDM system.

Area of Science:

• Optical Communications
• Signal Processing
• Nonlinear Optics

Background:

• Fiber-optic communication faces capacity limitations due to optical fiber nonlinearity.
• Nonlinear frequency-division multiplexing (NFDM) is a solution, but suffers from high peak-to-average power ratio (PAPR) due to multi-soliton periodicity.
• High PAPR negatively impacts system performance in NFDM.

Purpose of the Study:

• To propose a novel phase pre-equalization technique to mitigate high PAPR in NFDM systems.
• To jointly optimize transmitter and receiver parameters for reduced PAPR margin.
• To improve error performance and system robustness against perturbations.

Main Methods:

• Implementation of phase pre-equalization using optimal phase factors.
• Joint optimization of transmitter and receiver in the NFDM system model.
• Analysis of system performance with pre-equalization under various modulation schemes (8-QAM, 16-QAM).

Main Results:

• Phase pre-equalization effectively reduces PAPR at the receiver.
• Achieved data rates of 24 Gbps (8-QAM) and 24.67 Gbps (16-QAM) over 1000 km.
• Extended maximum transmission distance to 2150 km at 10 Gbps.
• Demonstrated improved error performance and reduced sensitivity to perturbations.

Conclusions:

• Phase pre-equalization is an effective method for reducing PAPR in NFDM systems.
• The proposed technique enhances data rates and transmission distances in optical fiber communication.
• NFDM systems with pre-equalization exhibit improved robustness and performance.