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Nonlinear mitigation on subcarrier-multiplexed PM-16QAM optical systems.

F P Guiomar, A Carena, G Bosco

|March 1, 2017

Summary

Symbol-rate optimization (SRO) boosts reach by ~9% in multi-subcarrier (MSC) systems. Combining SRO with digital backpropagation (DBP) offers limited additional gains due to performance constraints and nonlinear phase noise (NLPN).

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Area of Science:

Optical communication systems
Digital signal processing
Nonlinear optics

Background:

Multi-subcarrier (MSC) transmission with polarization-multiplexed 16-ary quadrature amplitude modulation (PM-16QAM) is crucial for high-capacity optical networks.
Nonlinear effects, such as self-channel interference (SCI) and nonlinear phase noise (NLPN), degrade transmission performance and limit reach.
Effective nonlinear mitigation strategies are essential for enhancing the capacity and reach of these systems.

Purpose of the Study:

To comprehensively evaluate the benefits of nonlinear mitigation strategies for MSC-PM-16QAM transmission systems.
To quantify the reach gains achieved by symbol-rate optimization (SRO) and digital backpropagation (DBP).
To investigate the interplay between SRO, DBP, SCI, and nonlinear phase noise (NLPN) and their impact on transmission performance.

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Main Methods:

Experimental demonstration of SRO in a 31-channel WDM transmission system.
Comparative analysis of DBP versus single-carrier (SC) transmission gains.
Investigation of SCI mitigation by DBP and its effect on SRO.
Analysis of nonlinear phase noise (NLPN) impact and symbol-rate dependence.
Evaluation of carrier phase estimation (CPE) for NLPN mitigation.

Main Results:

Symbol-rate optimization (SRO) achieved a maximum reach gain of approximately 9% in MSC-PM-16QAM transmission.
Digital backpropagation (DBP) provided gains comparable to SRO when compared to single-carrier (SC) transmission.
DBP effectively reduced self-channel interference (SCI), weakening the SRO phenomenon.
The combined effect of SRO and DBP yielded only an additional 4% reach gain due to experimental DBP limitations.
Nonlinear phase noise (NLPN) was found to be symbol-rate dependent, impacting transmission performance.

Conclusions:

Symbol-rate optimization offers significant reach enhancement for MSC-PM-16QAM systems.
While DBP mitigates SCI and enhances performance, its combination with SRO yields limited additional gains due to practical limitations.
Further research into advanced NLPN mitigation techniques beyond standard CPE is necessary to fully exploit the potential of high-capacity optical transmission systems.