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RP Fiber Calculator is a convenient tool for calculations on optical fibers.
RP Fiber Power is an extremely flexible tool for designing and optimizing fiber devices.
RP Resonator is a particularly flexible tool for laser resonator design.
RP ProPulse can simulate the pulse evolution e.g. in mode-locked lasers and sync-pumped OPOs.
RP Coating is a particularly flexible design tool for dielectric multilayer systems.
RP Q-switch can simulate the power evolution in Q-switched lasers.
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RP ProPulse – Numerical Simulation of Pulse Propagation

Example Case 7: Soliton Soliton Self-frequency Shift

In this example, we investigate the soliton self-frequency shift arising from stimulated Raman scattering in a fiber. The Raman gain, getting stronger towards longer wavelength, amplifies the longer-wavelength components within the pulse spectrum at the expense of power in the shorter-wavelength parts. In effect, the pulse spectrum more and more drifts towards longer wavelengths. Also, there is a slight decrease of pulse energy and an increase of the pulse duration. It has been assumed that there is no higher-order dispersion.

pulse parameters vs. propagation length

The diagram above compares the numerically simulated evolution of center wavelength with that of a simplified analytical model. They agree well.

Below you see results of a simulation where the pulse duration is varied. In agreement with the analytical theory, the numerical model shows that the self-frequency shift becomes substantially stronger for shorter pulse durations. This is because shorter pulses have a higher peak power and a broader spectrum, within which the Raman gain (increasing with the frequency offset) can have a stronger effect.

wavelength shift vs. pulse duration

(back to the list of example cases)

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