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We have analysed the output pulse characteristics of semiconductor optical amplifier (SOA). They can be modified due to the variation of input parameters, such as, gain, input pulsewidth and internal loss imposed by the medium. In our model, the effect of self-phase modulation (SPM) has taken into consideration to improve the accuracy of simulation results. The proper output pulse characteristics...
Starting from Nonlinear Schrodinger's equation and using the Split-step Fourier Method, we studied the characters of the supercontinuum generation of femtosecond laser pulse propagating in condensed media; many physical factors are included such as the propagation distance, the input pulse peak power, diffraction effect, dispersion effect and the nonlinear effect etc. The results show that, when the...
We demonstrate the generation of a flat supercontinuum (SC) at 1550 nm using photonic crystal fiber (PCF) of normal dispersion when injected by a fiber laser that is passively mode locked by single-wall carbon-nanotube-based saturable absorber (SWNT-SA). The self-started mode-locked laser with a threshold power of 52 mW together with the PCF can generate a SC covering 223 nm over the entire C+L band...
The performance of optical transmission system, which operates at data rates above 10 Gb/s is limited by fiber nonlinearity and group velocity dispersion (GVD). In this paper we have solved the nonlinear Schrodinger equation analytically using Volterra series for studying the impact of self-phase modulation (SPM) and GVD only on direct detection fiber-optic transmission system. In the anomalous dispersion...
The dynamics of nonlinear pulse propagation in optical fibers is governed by the famous nonlinear Schrodinger equation (NLSE), in which the group-velocity dispersion and self-phase modulation form a basic set of optical processes describing a broad range of realistic physical situations. In this work, by means of variational formalism for the NLSE, we derive exact analytical expressions for the variational...
In this paper, we intend to investigate the pulse propagation through standard hexagonal photonic crystal fiber (PCF) by both finite element method (FEM) and split step Fourier method (SSFM). We determine the propagation constant through the numerical simulation which reveals the novel fact that higher order dispersions, self phase modulation (SPM) and self steepening (SS) can be controlled by the...
We describe a simple erbium fiber based master oscillator power amplifier generating record 50 kW peak power in a diffraction and bandwidth limited pulse. The fiber oscillator uses carbon nanotubes for saturable absorption and modelocking. It is followed by a single mode Er fiber amplifier. Nonlinear Schrodinger equation (NLSE) simulations ignoring gain confirm that interaction between self phase...
A first optical manifestation of the Chen-Lee-Liu-type derivative nonlinear Schrodinger equation results in self-steepening of ultrashort pulses and shock formation without simultaneous self-phase modulation and spectral broadening. Experiments verify theory.
Raman fiber lasers (RFLs) are efficient light sources at frequencies where no other comparable all-solid-state sources are available. Especially if fiber Bragg gratings (FBGs) with narrow bandwidths are used, the bandwidth of the Stokes light is strongly broadened by Kerr nonlinearities like four-wave mixing (FWM), and self- and cross-phase modulation (SPM, XPM). In this letter, we discuss an exact...
The one dimensional nonlinear Schrodinger equation (NLSE) have wide range of applications in nonlinear optical and laser physics. The NLSE is pivotal to the description of RZ optical communications link providing description not only of pulse transmission in the presence of dispersion and nonlinearities but also pulse evolution during amplification in a single mode optical amplifier. The design of...
As always, a mathematical model is needed to describe the physical transmission channel. The nonlinear Schrodinger (NLS) equation is found to serve this role and it is used to describe the slowly-varying envelope of the optical field.
Summary form only given. In optical communication systems the bandwidth is limited by the chromatic dispersion of the optical fiber. One method to extend this limit is to use dispersion-compensating fibers (DCFs). We study the effects of self phase modulation (SPM) on the most basic link consisting of only one single mode fiber (SMF) and a DCF. In the present work we present an analytical theory based...
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