The relation between the dispersion and the loss for optical pulse propagating without distortion near the zero dispersion point in the fiber with slowly decreasing dispersion is obtained by means of an extended nonlinear Schrodinger equatiton. Modulational instability in the fiber with slowly decreasing dispersion is analyzed. Because of the fourthorder dispersion,modulational instability is still existed when secondorder dispersion equals to zero.
In this article,a highly nonlinear photonic crystal fiber with a pure silica core is designed and fabricated,of which the core diameter is 1.65μm,the air hole diameter 4.75μm,the space between the hole centers 5.35μm,the zero dispersion wavelength 1 120 nm and the dispersion at wavelength of 800 nm-88 ps/(nm.km).
The value of material dispersion is small and its slope is flatwhen the wavelength is longer than 1.6μm. The zero material dispersionwavelength λ_0 is 1.65μm and 1.69μm respectively.
We discuss the effect of amplification of the signal wave for its frequency-degenerate two-wave interaction with pumping, when the field frequency is tuned to the "zero dispersion" point.
A wideband nonlinear scattering spectrum (1.1—1.9 um) is obtained in a multimodeoptical fiber pumped with an A-O Q-switched Nd:YAG laser at 1.06 um.The spectrum forms a goodquasicontinuum at the zero-material-dispersion range of the fiber.Discussion about the generationmechanism of the continuum is given.It shows that the continuum is generated by combined interac-tion of stimulated Raman scattering and four-photon mixing.
The zero dispersion wavelength of CsCl-type crystal is calculated under tight-binding approximation, with Coulomb interaction between the electron and the hole at the nearest neighbouring sites taken into account. It is shown that the material system can be looked upon as an ensemble of a series of polarization wave oscillators when we deal with the interaction of light and matter. The strengths of the polarization wave oscillator are calculated. The material dispersion and the zero dispersion wavelengths f...
The chromatic dispersion measurement using phase shift technique is discussed In this paper. The spectral dispersion of single-mode fiber is measured and the zero chromatic dispersion wavelength, the slope of dispersion vs. wavelength are obtained. The chromatic dispersion of multimode fiber is also measured. The theoretical analysis of its accuracy is presented in the paper and the influence of random noise to phase shift measurement is calculated.The chromatic dispersion measurements have been carried on ...