Moreover, the nonlinear refractive index changes ( Δnnl,max ) at volume fraction of 18x 10-6 irradiated by various laser intensities (137.31, 200, 228, 268, and 366.61 W/cm2) have higher value than others. That phase delay which has the same temporal shape as the optical intensity. an optical fiber) causes a nonlinear phase delay of the propagating light. Due to the Kerr effect, high optical intensity in a medium (e.g. KEYWORDS : (FSO)communication system, atmosphere attenuation. The results showed that tunable nonlinear refractive indices were obtained and increasing of incident laser power density led to increase the nonlinear refractive index changes of suspension at each volume fraction. networks using ultradense WDM channel groups, IEEE Photonic Technology Letters Vol.16, No.,8, pp.1966-1968, 2004. Definition: nonlinear phase modulation of a beam, caused by its own intensity via the Kerr effect. using(OptiSystem 7.0) for Performance Characterization of the Free Space Optical. In this paper, a formation of tunable nonlinear refractive index change of hybrid functionalized carbon nanotubes/silver nanoparticles acetone suspensions (F-MWCNTs/Ag-NPs) at weight mixing ratio of 1:3 and volume fraction of 6x10-6, 9x10-6, and 18x10-6 using laser beam at wavelength of 473nm was investigated experimentally.
The nonlinear refractive index change of material depends on the number of pattern rings.
are compared with each other.Focusing of Gaussian laser beam through nonlinear media can induce spatial self- phase modulation which forms a far field intensity pattern of concentric rings.
Simulation results of self phase modulation and cross phase modulation obtained in OPTISYSTEM tool which is made by OPTIWAVE INC. These effects are simulated using OPTISYSTEM tool at a bit rate of 10Gbps and analyzed by eye pattern method with respect to bit error rate and Q factor.
2.2.1 Duobinary Modulation Figure 2 shows the simulation setup in optisystem software for two channels transmitted using duobinary modulation. These schemes are compared on the basis of various parameters like input power level, noise power and SNR. The aim of the research is to obtain the optimal shape of the input optical pulse for the proper functioning of the self-phase modulation. So, in this paper, we have analyzed non linear modulation techniques that are self phase modulation (SPM) and cross phase modulation (CPM) in an optical fiber system and discussed how these cause dispersion in input signal. Duobinary modulation, Hybrid modulation, QAM mod-ulation, QPSK modulation and DPSK modulation. Abstract- Use of optical fiber communication is widely use due to its better bit rate and bandwidth and high carrier frequency with low power consumption.
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