It is shown that, the amount of suppression of the second order sideband (lower or upper) increases with the increase in the Extinction Ratio (ER) of the MZM. The SSB with 120° hybrid coupler suppresses lower first order and upper second order sideband (or upper first order and lower second order sideband).
The increase in modulation index leads to increased harmonic distortion at the receiver. The 2nd and higher order harmonics generated due to non-linearity of the MZM depends upon the modulation index. The conventional OSSB generation technique with 90° phase difference suppresses either lower or upper first order sideband but 2nd order harmonics still exists in the spectrum. The RF signal at the input of a dual drive Mach Zehnder Modulator (MZM) is divided in two parts equally with an electrical hybrid coupler providing a phase difference of 90° and 120° respectively to generate two different SSB techniques. It takes into account the problem of the chromatic dispersion in the single mode fibers in Passive Optical Networks (PON), which severely degrades the performance of the system.
R.This paper provides an insight on the generation and the performance analysis of two different optical single sideband (OSSB) modulation techniques depending on the phase angle of the electrical hybrid coupler. This is basis of a scheme for quantum nondemolition (QND) measurements. the measurement of the optical intensity of one pulse by monitoring a phase change of the other one (without absorbing any photons of the first beam). The distortion caused by chromatic dispersion can be eliminated by using dispersion compensating devices. Cross-phase modulation can be relevant under different circumstances: It leads to an interaction of laser pulses in a medium, which allows e.g. Using OptiSystem’s Bidirectional optical fiber component, it is possible to model and measure Rayleigh, Brillouin and Raman scattering effects. This lesson demonstrates the basic effects of self-phase modulation (SPM) on pulse propagation. Self-phase modulation (SPM) is one of the major non-linear effect in single-tone radio over fiber system which limits the long-distance transmission as it leads to the broadening of pulse spectrum. This puts the constraint into design of dispersion compensation techniques 1,2,9. Advanced, highly parameterized, optical fiber models can be used to characterize single mode and multi-mode signal propagation including linear (dispersion), stochastic (PMD), and non-linear impairments (FWM, self-phase modulation, and cross-phase modulation). Agrawal, Nonlinear Fiber Optics, 4th edn., Academic Press, New York (2007) the effects of non linearity like Self Phase Modulation (SPM), Cross Phase Modulation (CPM), stimulated Inelastic Scattering and Four Wave Mixing (FWM). Matsuda et al., “Observation of optical-fibre Kerr nonlinearity at the single-photon levels”, Nature Photon. Margalit et al., “Cross phase modulation squeezing in optical fibers”, Opt. Wabnitz, “Electrostrictive cross-phase modulation of periodic pulse trains in optical fibers”, Opt. Furthermore the graph for the Quality Factor at the different values of optical dispersion is also drawn.
These effects are seen from the eye diagrams drawn for the different values of dispersion. KeywordsSMF, DCF, EDFA, distributed amplification, lumped amplification NRZ, optical phase conjugator, fiber bragg grating, Self phase modulation, Cross phase. Optical phase conjugator method for dispersion compensation is simulated using optsim 5.3 software.
#Self phase modulation using optisystem software
Shtaif, “Analytical description of cross-phase modulation in dispersive optical fibers”, Opt. The simulations have been carried out using Optisystem software version 12. Islam et al., “Cross-phase modulation in optical fibers”, Opt.
0 kommentar(er)
