We designed a coupled resonator structure and studied its transmission properties through the tightbinding approach and the transfer matrix method. Based on the coupling of resonant modes and the electro-optic effect, some comb-channels with two orthogonal polarizations can be obtained. The total number of channels is two times the number of resonators. The orthogonal polarization channels cann...

High resolution echelle spectroscopy in ground-based UV is a powerful facility for study of chemical evolution of early Galaxy. An atlas of high resolution (R=60000) in the poor studied wavelength range 3550–5000 ÅÅ for 4 metal-deficient stars in the interval of metallicity −3.0 < [Fe/H ] < −0.6, effective temperature 4750 < Teff < 5900K, surface gravity 1.6 < lg g < 5.0 is produced. Details of...

We report on a calibration procedure that enhances the precision of an interferometer based frequency stabilization by several orders of magnitude. For this purpose the frequency deviations of the stabilization are measured precisely by means of a frequency comb. This allows to implement several calibration steps that compensate different systematic errors. The resulting frequency deviation is ...

Present paper describes application of a computer intensive methodology to evaluate antenna susceptibility to random physical damage for a Dipole and a Bow-tie antenna. For each randomly generated damage pattern antenna parameters are simulated and statistical comparison is performed. Computer intensive statistical methods like the Bootstrap used for the post processing make fewer initial assum...

A photonic crystal polarization beam splitter based on photonic band gap and self-collimation effects is designed for optical communication wavelengths. The photonic crystal structure consists of a polarization-insensitive self-collimation region and a splitting region. TMand TE-polarized waves propagate without diffraction in the self-collimation region, whereas they split by 90 degrees in the...

The paper deals with on-line routing in WDM (wavelength division multiplexing) optical networks. A sequence of requests arrives over time, each is a pair of nodes to be connected by a path. The problem is to assign a wavelength and a path to each pair, so that no two paths sharing a link are assigned the same wavelength. The goal is to minimize the number of wavelengths used to establish all co...

Ground-based sub-mm and mm-wavelength blank-field surveys have identified more than 100 sources, the majority of which are believed to be dusty optically-obscured starburst galaxies. Colours derived from various combinations of FIR, submillimetre, millimetre, and radio fluxes provide the only currently available means to determine the redshift distribution of this new galaxy population. In this...