Modern Fiber Optic Communication Systems Simulations with Advanced Level Matlab Modules
Nonlinear Fiber Optics
Nonlinear Pulse Propagation in Optical Fibers
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(1) Use the Existing Modules / Components for Your Research & Development.
(2) Modify the Modules / Components to the Next Level for Your Research & Development.
(3) Integrate Different Modules / Components in the OCSim Package to Realize Your Own Fiber Optic Communication Systems.
(4) Modify the Modules for Co-Simulations with the Third Party Commercial Optical Communication Systems Softwares.
Simulation of Nonlinear Schrodinger Equation (NLSE) using the split-step Fourier scheme (SSFS). In SSFS, first NLSE is solved by ignoring nonlinearity over a small fiber section. The linear part is solved using a pair of FFTs. Next, the NLSE is solved by ignoring the linear part. This split-step approach is carried out iteratively.
This Module calls the following Sub Module / Component:
Which is a submodule to solve NLSE.
Explore Further this Module:
10.1 Set the dispersion coefficient, to zero and loss coefficient, to zero. Launch a Gaussian pulse to the fiber. Compare the spectral width before and after propagation. Does the spectrum broaden? Explain. Does the pulse width (in time domain) change after the propagation? Calculate the rms spectral width and plot it as a function of fiber length.
10.2 Set the fiber length to 80 km. Change from 0 to 14 ps.ps/km with a step of 2 ps.ps/km. Adjust the computational window (tmin and tmax) if necessary. Observe that the spectral broadening is reduced as the dispersion increases. Plot the rms spectral width vs dispersion coefficient . Does the pulse width change as changes?
10.3 Set the dispersion coefficient, to -5 ps.ps/km, loss coefficient, to zero and fiber length to 80 km. Launch a secant-hyperbolic pulse to the fiber with the appropriate power so that the soliton is excited. Compare the pulse width before and after propagation. Compare the spectral width before and after propagation. Plot the soliton phase as a function of distance.
Selected Simulated Results Using this Module
Time Diagrams: Red – Input, Blue – Output
Spectrum: Red – Input, Blue – Output with Linear Scale
Spectrum: Red – Input, Blue – Output with Logarithmic Scale