abta.blogg.se - Self phase modulation using optisystem

In optical fibers, SPM can be the dominant effect on an ultrashort pulse if the peak power is high (leading to strong SPM) while the chromatic dispersion is weak, so that the pulse duration remains approximately constant.įigure 3 shows an example case where that assumption is well fulfilled within the first 30 mm of fiber here, the overall spectral width rises about linearly with the propagation distance. The simulation has been done with the software RP Fiber Power. Spectrum of an initially unchirped 1-ps pulse which has experienced strong self-phase modulation (with a peak nonlinear phase shift of 20 rad), leading to characteristic oscillations of the power spectral density. The reason for the oscillatory character is essentially that the instantaneous frequency undergoes strong excursions, so that in general there are contributions from two different times to the Fourier integral for a given frequency component.ĭepending on the exact frequency, these contributions may constructively add up or cancel each other (see also Ref.

Spectral compression can result if the initial pulse is downchirped (always assuming a positive nonlinear index).įor strong SPM, the optical spectrum can exhibit strong oscillations (see Figure 2).

If the pulse is initially unchirped or up-chirped, SPM leads to spectral broadening (an increase in optical bandwidth).

Optiwave.The time-dependent phase change caused by SPM is associated with a modification of the optical spectrum: Видео - Coherent Optical OFDM канала OPTIWAVEHD Optiwave's suite of software tools include OptiSystem, OptiFDTD, OptiBPM, OptiSPICE, OptiGrating, and OptiFiber. The robust simulation environment enables users to plan, test and simulate optical links in the physical layer of a variety of passive optical networks: BPON, EPON, GPON. The professional design environment of OptiSystem can simulate emerging PON technologies, such as the various optical code-division multiple-access (OCDMA) techniques for OCDMA-PON architectures.

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