DSP-Assisted Nonlinear Impairments Tolerant 100 Gbps Optical Backhaul Network for Long-Haul Transmission

Area of Science:

• Optical Communications
• Telecommunications Engineering
• Signal Processing

Background:

• Optical fibers offer high capacity and low loss for backhaul networks.
• Long-haul, high-capacity communication systems face challenges from amplified spontaneous emission (ASE) noise and nonlinear effects.

Purpose of the Study:

• To investigate a distortion-tolerant 100 Gbps wavelength division multiplexed (WDM) system for long-haul transport.
• To analyze design parameters for mitigating ASE noise and nonlinear effects.
• To evaluate performance degradation and propose a digital signal processing (DSP) assisted receiver.

Main Methods:

• Analysis of design parameters in a WDM system.
• Evaluation of performance degradation due to nonlinear effects.
• Implementation of a DSP-assisted receiver.
• Analytical calculations and simulation of the WDM system.

Main Results:

• Achieved a bit error rate (BER) of 1.56 × 10-6 and a quality factor (Q-factor) of 5.
• Successfully mitigated nonlinear effects for optical fiber transmission up to 300 km.
• Demonstrated effectiveness using 25 and 50 GHz channel spacing with a 90 μm² effective fiber area.

Conclusions:

• The proposed DSP-assisted receiver effectively mitigates nonlinear effects in long-haul WDM systems.
• The investigated framework supports high-capacity, distortion-tolerant optical fiber communication.
• The approach is validated for reliable transmission over extended distances.