Suppression of ghost pulses in 40Gbps optical transmission systems with fixed-pattern phase modulation

Area of Science:

• Optical Communications
• Photonics
• Nonlinear Optics

Background:

• Interference-mixing four-wave mixing (IFWM) causes ghost pulses in high-speed optical transmission.
• RZ (Return-to-Zero) optical systems are susceptible to nonlinear impairments like IFWM.
• Ghost pulses degrade signal integrity and limit transmission performance.

Purpose of the Study:

• To propose a novel fixed-pattern phase modulation scheme.
• To suppress IFWM-induced ghost pulses in 40Gbps RZ optical transmission systems.
• To enhance the nonlinearity tolerance and overall performance of these systems.

Main Methods:

• Implementing a fixed-pattern phase modulation strategy.
• Destructing IFWM components through symmetric interference patterns.
• Analyzing system performance with the proposed modulation scheme.

Main Results:

• Successful suppression of IFWM-induced ghost pulses.
• Achievement of over 3dBm launch power margin.
• Demonstrated improvement in system performance and nonlinearity tolerance.

Conclusions:

• The proposed fixed-pattern phase modulation is an effective method for ghost pulse suppression.
• This technique offers a cost-effective solution for enhancing 40Gbps RZ optical systems.
• The method significantly improves system robustness against nonlinear effects.