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Improving performance of optical phase conjugation by splitting the nonlinear element.

Monir Morshed¹, Arthur J Lowery, Liang B Du

¹Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Department of Electrical & Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia.

|March 14, 2013

Summary

Optical phase conjugation (OPC) for mid-span spectral inversion (MSSI) is improved by splitting the nonlinear element and adding a filter. This method reduces fundamental limitations, enhancing signal quality in CO-OFDM systems.

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Area of Science:

Photonics
Optical Communications
Nonlinear Optics

Background:

Mid-span spectral inversion (MSSI) is crucial for long-haul optical communication systems.
Optical phase conjugation (OPC) using third-order nonlinear effects is a key technique for MSSI.
Cross-phase-modulation (XPM) products generated during OPC can degrade signal quality.

Purpose of the Study:

To enhance the performance of OPC-based MSSI by mitigating nonlinear impairments.
To improve the maximum signal quality (Qmax) in high-speed coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems.

Main Methods:

Splitting the nonlinear element into two parts for OPC.
Introducing a band-stop optical filter between the nonlinear elements.

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Utilizing numerical simulations to analyze the impact of the filter on XPM products.

Evaluating system performance in a 10 × 80-km 4-QAM 224-Gb/s CO-OFDM system.

Main Results:

The band-stop filter effectively suppresses cross-phase-modulation products near the pump.
This suppression reduces the fundamental limitations imposed by OPC by 3 dB.
A significant improvement in maximum signal quality (Qmax) of 1 dB was achieved.

Conclusions:

The proposed method of splitting the nonlinear element and adding a filter improves OPC-based MSSI.
This technique offers a practical approach to enhance signal quality in high-capacity optical communication systems.
The findings demonstrate a viable strategy for overcoming nonlinear limitations in advanced optical networks.