In this paper four wave mixing effect in fiber optical communication line with Raman amplifiers is analyzed. Method and expression for calculation of efficiently interacting channels are presented. Developed model for calculation FWM power taking into account distributed Raman amplification. An analytical solution for FWM noise allows reducing time expenses at simulations. Results of calculation FWM noise for different parameters of optical line, WDM system and Raman amplifier gain are presented.

Numerical analysis of CATV network radiation will be carried out. CATV network is modeled as a system with rectangular and polar the amplitude-phase distributions of electromagnetic energy. The results of calculations of fields of electromagnetic leakages for different typical cases of an interleaf of cables are given. Is shown, that the traditional expedients of organization of CATV networks, give in an inphase interference of electromagnetic fields of leakages and rather to strong radiation. As is shown, that at usage of fiber-optical turnpike channels, the radiant intensity is essentially reduced.

The effective simulation technique of multipath interference in optical line consisting of different types of single-mode fibers, such as dispersion management lines, is proposed. The proposed technique also valid for analysis multipath interference in optical lines with distributed Raman amplification. The simulation technique is validated by comparison with exact solutions for lines without and with distributed Raman amplifier.

Results of analytical research of some properties of the nonlinear phase filters working in a mode of indemnification of dispersive distortions ofpulse signals at an electric level in fiber-optical lines of transfer are resulted.

Fiber Bragg gratings are the most important elements in different fiber optics devices and are widely used both in fiberoptic communications and fiber optic sensor applications. The paper considers the integral analysis of FBG reflection spectrum (the analysis of two-frequency signal envelope). Firstly this method was supposed for studying the abstract circuit. In this paper it has been developed to analyze FBG with arbitrary shape of reflection spectrum.

Clause is devoted to discussion of an opportunity of reception transparent nanocrystal samples. The opportunity of processing of polycrystalline glass and quartz samples by a method of intensive torsion under a high pressure was investigated. It is established, that because of absence of a zone of plasticity of a material for preservation of integrity of the sample it is necessary to apply heating. The given material is supposed to be used for creation of switchboards of the optical signals operated by in addition submitted optical radiation. It is supposed, that operating radiation changes a parameter of refraction of the optical environment of the device, and with it and length of a wave of information radiation. For the control of last it is used multibeam interferometer. The brief estimation of technical aspects of construction of the device is lead. The analysis has shown, that interference switchboard is essentially technically sold. It is possible to carry presence of a constant component to its basic lacks in interferometer to a picture and distortion by action of interference and nonlinear optical effects ofa digital optical signal.

Measuring the power distribution among transverse modes of coherent light in optical fibers and excitation of transverse modes or modal groups in a fiber are of practical significance for development and investigation of fiber lasers, sensors and fiber communication lines. The feasibility of mode generation in a step-index optical fiber using binary phase diffractive optical elements (DOEs) is studied. Modes different from the principal mode are selectively excited in the optical fiber using the binary phase DOEs. It is also reasonable to make a computer simulation of mode excitation to predict the behavior of optical system. Simulation results prove theoretical derivations on characteristics of mode excitation. These results are also in a good concordance with experimental ones.

Approximate method for chromatic dispersion estimation of the high-order guided modes, propagating along the core of the weakly guiding single-cladding optical fiber with an arbitrary graded refractive index profile, is represented. Proposed method is based on the modified Gaussian approximation, and does not require to equate and find solutions of the simultaneous integro-differential equations. By applying presented method, chromatic dispersion curves both for the fundamental and high-order modes were obtained, and compared with exact solutions, corresponding to ideal step index and non-limited parabolic profiles. In all cases, good accuracy was noticed.

Differential-mode delay (DMD) versus wavelength curves, been calculated for laser-optimized multimode fibers of different specifications, are represented. Wavelength ranges, corresponding to minimum DMD value, are localized. Results of DMD curve smoothing under high-order mode suppression are also shown.

The information technology of remotely sensed image analysis is based on system integration of two main concepts: diffractive optical elements (DOEs) aided multispectral preprocessing and multiscale analysis. Proposed technology allows to: decrease the threshold of hidden signal detection; detect the signals with unknown form; improve the performance of subpixel signal detection and estimation in case of limited resolution of sensors. Data preprocessing method for anomaly detection on the base of DOE technology is developed. DOE-based technology is implemented and tested. Nonparametric statistic methods for signal detection and estimation are proposed. Multiresolution image analysis methods are applied for anomaly detection and estimation.

Onboard analysis of remotely sensed images can help in the case of real time processing of high resolution Earth images, giving the possibility of selecting frames, containing essential information, for transmission to ground station (for reducing the data flow). One of possible methods of frames selection is image texture analysis on base of spatial frequencies spectrum processing. The questions of incoherent light source usage in the optoelectronic Fourier spectrum analyser are considered. Using of incoherent light source of specific size and shape makes it possible to provide an optimal spatial filtering of the spectrum, reduce a sensitivity to phase distortions and obtain a compact and rugged design of the device. Special algorithm of spectrum image digitising is developed to enlarge a range of spatial frequencies to be processed and maximise the photosensitivity. The algorithms for texture properties recognition are developed and tested using prototype incoherent Fourier spectrum analyzer.

The images analysis method for detecting anomaly and its boundary, based on nonparametric criterion for detection of change point of random fields and postanalysis of statistics, is proposed. The objects to be detected on the images of earth's surface or ocean in a possible mathematical model are represented as relatively large homogeneous adjacent subareas (stochastic textures) with rather smooth boundaries. Properties of nonparametric statistical methods for identification of structural anomaly boundaries on optical images in multivariate change point problem are investigated.

In this paper the problem of compensating of effects of deterioration of a spatial resolution SAR owing to atmospheric propagation effects in P, VHF bands and errors of knowledge of geometry of relative driving SAR and reflecting surface is considered. The algorithms of blind reconstruction of SAR images, based on contrast functions method, for cases both parametrical, and nonparametric indeterminacy are offered.

In this paper the problem of compensating of effects of deterioration of a spatial resolution SAR owing to atmospheric propagation effects in P, VHF bands and errors of knowledge of geometry of relative driving SAR and reflecting surface is considered. The algorithms of blind reconstruction of SAR images, based on contrast functions method, for cases both parametrical, and nonparametric indeterminacy are offered.

A methodological approach to multiscale selection and detection of signals in optical observation systems is proposed. The approach is based on system integration of four conceptions: fractal sets, recursive scanning, continuous wavelet transforms (WT), discrete wavelet transforms. The approach allows improving the performance of anomalous signal detection in tangled background situation.

Optical cable jointing is one of the most important parts of the fiber optic telecommunication line installation. For practical applications it is interesting to use some universal material kit for the sealing of the fiber optic closure ports with various cables, differing by their types and manufactures, in addition to basic closure kit. Here a reasonable question occurs: is it possible to develop universal instruction manuals for various combinations of optical cable and universal fiber optic closures, based on closure kit and generalized additional kit, contenting the most conventional sealing materials? It is obviously, technological tests are required to answer the mentioned question. Here, some results of investigations are represented.

For fiber-optic links (FOL), the sufficient time of repairing (removing & reinstalling) fiber-optic cables (FOC) and the natural ageing of optical fibers (OF) have been stipulating and propelling the problems of safe communication. The latters used to and are nowadays resolved by mean of either reserving line, cables, fibers, digital streams or improving quality of FOC grooming. In the latter case, the implementation of a prognostic control of FOC plays sufficient role in fault prediction on maintenance stage of FOL. The prognostic control is performed by mean of Remote Test Fiber Systems (RFTS) on the basis of both direct controlling OF parameters and indirect methods of FOC monitoring, including, being applied at Volgograd City Telephone Network, RLTP Method (Rate Loss Time Prediction) designed for copper/ steel media. Thus for example a prediction method on the basis of protective sheath monitoring results of FOC. This method is very effective when applied for buried long-haul FOC and in widespread use in Russia. One of the problems ofthe method performance is how to maintenance satisfactory sheath condition ofFOC. In general, the main trouble is how to localize faults on the protective sheath. There are however some classical techniques which are similar to the applied techniques in fault localization in copper media, but when applied for FOL, the techniques have specifics. The purpose of the paper is to analyze specifics ofthe classical technique implementation for fault localization ofprotective sheath of FOC.

While fiber optical transmission lines (FOTL) in service it is made a decision on carrying out of emergency-regenerative works (ERW) in which course there is a measurement of attenuation on a cable insert. Results of the given measurements are defined by parameters of approximating straight lines adjoining to an insert quasi-regular sections which in turn depend on a choice of optimum parameters of an optical reflectometer operating mode. In article research results of measurement errors of optical insert attenuation are submitted depending on length of adjoining sections. Recommendations are resulted at the choice of an optimum operating mode of optical reflectometer.

Novel method for optical fibre beat length estimation by POTDR with extended testing pulse width is represented. Results of experimental investigations of introduced method are described. Comparing between well known and introduced method for optical fibre beat length measurement was done. A good agreement between comparing results can be noticed.