Digital back-propagation (DBP) is a technique for compensating all

fiber Fiber (spelled fibre in British English; from ) is a natural or artificial substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often inco ...

impairments in optical transmission systems. DBP is a sort of non-linearity compensation (NLC). DBP uses the back-propagation

algorithm In mathematics and computer science, an algorithm () is a finite sequence of Rigour#Mathematics, mathematically rigorous instructions, typically used to solve a class of specific Computational problem, problems or to perform a computation. Algo ...

in the digital domain by solving the inverse nonlinear

Schrödinger equation The Schrödinger equation is a partial differential equation that governs the wave function of a non-relativistic quantum-mechanical system. Its discovery was a significant landmark in the development of quantum mechanics. It is named after E ...

of the fiber link using the split-step Fourier method (SSFM) to calculate the transmitted signal from the received signal. In principle, digital back-propagation is capable of fully reversing the effects of nonlinear propagation in optical fibers, yet in practice it is limited by the stochastic nature of some impairments, like amplified spontaneous emission and polarization mode dispersion.

References

{{reflist Fiber-optic communications