Design and Simulate Modern Fiber Optic Communication Systems

Module 10

 

Nonlinear Fiber Optics

 

(1) Use the Existing Modules / Components for Your Research Papers, Research Projects, Theses and Lab Simulation Experiments.
(2) Modify the Modules / Components to the Next Level for Your Research Papers, Research Projects and Theses.
(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.

 

Source Code: nlse_solver.m

Simulation of nonlinear Schrodinger equation 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 source code calls the following function:

fiber_prop.m which is a subroutine to solve NLSE.

Explore Further this Module:

10.1 Set the dispersion coefficient, beta2 to zero and loss coefficient, alpha 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 beta2 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 beta2. Does the pulse width change as beta2 changes?

10.3 Set the dispersion coefficient, beta2 to -5 ps.ps/km, loss coefficient, alpha 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.

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Selected Simulated Results

Simulation of Nonlinear Pulse Propagation in an Optical Fiber Using Split-Step Fourier Scheme (SSFS) (Click to See the Results)

 

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