11-08-2012, 01:00 PM
Numerical Tools for Simulation of Pulse Propagation in Optical Fibres
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Split-Step Fourier Method
It is a pseudospectral method
Pseudospectral methods are faster than the general
numerical method by up to an order of magnitude to
achieve the same accuracy
In general, dispersion and nonlinearity act together along
the length of the fiber
The method obtains an approximate solution by assuming
that in propagating the optical field over a small distance h,
the dispersive and nonlinear effects can be pretended to
act independently
More specifically, propagation from z to z + h is carried out
in two steps
Remarks
Benchmark your code for correctness, accuracy & stability
Make sure whether you work with normaised units or real
units
Units are very important & they also help you to avoid
mistakes
Documentation & commenting the program is very
important
Tidy up the program and keep all the numerical input data
as a single block in the very beginning of the program or
as a separate program
For the program we have seen today and more simulation
programs goto
Conclusion
We have learnt the SSFM to simulate a pulse propagation
in SMF
We have also seen how to code it in MATLAB
This program can be easily modified for the simulation of
pulse train propagation
Optical amplifiers with ASE noise & filters can also be
incorporated
Dispersion-managed optical fibre can also be simulated
using SSFM
Enjoy simulating pulse propagation in optical fibres