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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

Nonlinear Digital Back Propagation compensator for coherent optical OFDM based on factorizing the Volterra Series

Gal Shulkind¹, Moshe Nazarathy

¹EE Department, Technion, Israel Institute of Technology, Haifa, Israel.

|June 6, 2013

Summary

This summary is machine-generated.

We developed a new nonlinear compensator (NLC) for digital back-propagation (DBP) in optical OFDM receivers. This efficient method significantly improves nonlinear tolerance in optical communication systems.

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Area of Science:

Optical Communications
Digital Signal Processing
Nonlinear Optics

Background:

Digital back-propagation (DBP) is crucial for mitigating nonlinear impairments in coherent optical OFDM systems.
Existing Volterra Series Transfer Function (VSTF) based nonlinear compensation methods face high computational complexity.
There is a need for efficient and accurate nonlinear compensation techniques to enhance receiver performance.

Purpose of the Study:

To introduce an efficient and accurate nonlinear compensator (NLC) for DBP in coherent optical OFDM receivers.
To reduce the computational complexity of nonlinear compensation based on VSTF.
To improve the nonlinear tolerance of optical communication links.

Main Methods:

A novel factorization procedure for the Volterra Series Transfer Function (VSTF) is proposed.
The proposed method reduces the nonlinear compensation complexity from O(N^2) to 28 + 6logN.
The NLC system was analyzed and simulated for performance evaluation.

Main Results:

The proposed NLC system demonstrates superior performance compared to previous VSTF-based nonlinear compensation methods.
The new method achieves an improved nonlinear tolerance of approximately 2 dB for the analyzed link.
The computational complexity of the new method is 52% higher than a recent VSTF-based method, but offers significant performance gains.

Conclusions:

The developed NLC provides an efficient and accurate solution for nonlinear compensation in DBP.
This approach effectively enhances nonlinear tolerance in coherent optical OFDM systems.
The trade-off between computational complexity and performance improvement is favorable for practical applications.