The dispersion managed pairs, consisting of RDF and non-zero dispersion shifted fiber with ultra large effective-core-area (ULAF), have the ultra low dispersion slope of less than 0.006 ps/(nm2·km) at the wavelength range from 1530 nm to 1625 nm, and the largest dispersion value is lower than 0.2 ps/(nm·km).

When the third ring diameter of varying microstructured fiber has the same value with the diameter of no varying microstructured fiber, the lowest and flattest dispersion curve is obtained, in this case, the dispersion value is about 30 ps/(km·nm) and Δd=0.2 μm. So the flatter and lower dispersion curve can be realized by adjusting the diameters, distribution of air holes, and the hole to hole space.

This paper discusses the relation of the cccurrence rate of histles and thistle dispersion value with the magnetic activity in Wuchang and Zhanjiang regions in the winter from 1980 to 1981. The result from ob-servation shows that the whistle activity in the low-latitude, region is positively correlated with the magnetic activity.

Results show that DDF with concave dispersion profile is more beneficial to generate flat and broad SC spectra,when the dispersion profile of the fiber is symmetrical to central wavelength and decreases from anomalous dispersion region to normal with propagation distance.

Furthermore,according to the dispersion property of the conventional fiber,a κ matched dispersion compensation PCF is designed with a dispersion of-519.3ps/km/nm.

The designed fiber has the effective core area of more than 95 μm 2 and the dispersion of about 9 ps/(nm·km) at 1550 nm, which can suppress the nonlinearity on the transmission system effectively.

A method for dynamic chromatic dispersion (CD) compensation in a 40Gbit/s single-channeled optical fiber communication system is demonstrated in this paper.

Microstructure fibers with a special dispersion profile are at the heart of the experimental implementation of this technique.

Fibers with an appropriately tailored dispersion profile allow simultaneous phase matching for two types of nonlinear-optical processes-third-harmonic generation and parametric four-wave mixing.

Hollow-core photonic-crystal fibers with a special dispersion profile are shown to allow phase-matched nonlinear optical interactions of isolated air-guided modes of high-intensity femtosecond laser pulses confined in the hollow fiber core.

A new method to derive the kinetic energies associated to rotational and random motions from the observed rotation curve and velocity dispersion profile of elleptical galaxies is presented.

Its efficiency for supercontinuum generation and especially the extension to the blue side can be increased by proper design of the dispersion profile.

In this paper,the general characteristics of low-latitude whistler propagation is investigated by analysing the data obtained at Wuchang (geom.lat.19.2°N) for last three years.Attention is paid to the study of whistler propagation paths.Besides,a closed examination is made of the correlation between the whistler parameters at Wuchang and ionospheric electron concentration,as well as the geomagnetic activity.A good correlation has been found between whistler dispersion and f0F2.It is also shown that there exists...

In this paper,the general characteristics of low-latitude whistler propagation is investigated by analysing the data obtained at Wuchang (geom.lat.19.2°N) for last three years.Attention is paid to the study of whistler propagation paths.Besides,a closed examination is made of the correlation between the whistler parameters at Wuchang and ionospheric electron concentration,as well as the geomagnetic activity.A good correlation has been found between whistler dispersion and f0F2.It is also shown that there exists a type of whistler with stationary dispersion values,the occurrence rate of which is much higher than other types.This is one of the remarkable features of whistlers at Wuchang,showing that in the low-latitude ionosphere region there possibly exist stationary and recurrent whistler propagation paths.In addition,analysis of typical events and statistical calculation both show that the occurrence rate of whistlers increases considerably during magnetic storms.The dispersion value slightly increases following the SSC of the storms,the amplitude of the increase being 118-137% of the monthly mean value.

In view of the large difference between the real geomagnetic field and the dipolar model field at low latitudes, ray tracing for whistler-mode wave propagation has been performed with IGRF (n=6). It is found that there are two narrow nonducted propagation outlets of whistler-mode wave at about 9° N and 12°N, their starting regions are in the area of storm activity. The cutoff latitude of outlet of whistler-mode wave is at 8°N-9°N. The results of this computation can be used satisfactorily to explain the fact...

In view of the large difference between the real geomagnetic field and the dipolar model field at low latitudes, ray tracing for whistler-mode wave propagation has been performed with IGRF (n=6). It is found that there are two narrow nonducted propagation outlets of whistler-mode wave at about 9° N and 12°N, their starting regions are in the area of storm activity. The cutoff latitude of outlet of whistler-mode wave is at 8°N-9°N. The results of this computation can be used satisfactorily to explain the fact that the dispersion of whistler at low latitude is in positive correlation with f0F2.

In this paper the whistler data from three stations, Mohe, Harbin and Beijing, inthe winter of 1983 are statistically analysed. It is shown that whistler activities of thesethree stations have peaks during sunset and after midnight. The mean whistler disper-sion value is larger during sunset, implying that whistlers may propagate from higherlatitudes to lower latitudes after passing through the ionosphere. After midnight, themean whistler dispersion value is lower, implying propagation of whistlers from lowerlatitudes...

In this paper the whistler data from three stations, Mohe, Harbin and Beijing, inthe winter of 1983 are statistically analysed. It is shown that whistler activities of thesethree stations have peaks during sunset and after midnight. The mean whistler disper-sion value is larger during sunset, implying that whistlers may propagate from higherlatitudes to lower latitudes after passing through the ionosphere. After midnight, themean whistler dispersion value is lower, implying propagation of whistlers from lowerlatitudes to higher latitudes. Mohe and Harbin all possess characteristics of middlelatitude type, while Beijing, of lower latitude type.