This PDF file contains the front matter associated with SPIE Proceedings Volume 7374, including the Title Page, Copyright information, Table of Contents, Introduction (if any), and the Conference Committee listing.

Considering a numerical example, we analyse the performance of Return-to-Zero (RZ) Differential Phase Shift Keyed (DPSK) transmission when deployed in a large scale transmission system. It is shown that at high distances, RZ-DPSK performs well whilst being limited by nonlinear effects. We also show that when nonlinear effects become dominant, we can still estimate channel statistics to reasonable accuracy.

Fiber O -band usability in DWDM systems is discussed, limiting factors are described and methods and devices for FWM effect mitigation are reviewed, novel approach to handle this problem is proposed.

The importance of synchronization signal quality under data transmission in synchronous telecommunication systems is shown. The existing mathematical models brief analysis of phase self-tuning systems and an error probability are considered. The magnitude of a signal mismatch being in difference from known more full performance of a synchronization quality is offered. Expressions for bit error probability due to probable synchronization inaccuracy and gauss noise for two types of resolvers are obtained.

In this paper cross-phase modulation in mutichannel dispersion managed soliton systems was investigated. Method for evolution of main optical soliton parameters for two-channel WDM systems based on variatonal approach was proposed. Results of soliton propagation simulation in communication lines with different dispersion maps are represented and comparison with numerical method was carried out.

Simulation results of few-mode signal propagation over silica graded multimode optical fibers with periodical slowly varying core diameter, excited by laser source, are represented. Weakly-guiding irregular multimode fibers with axialsymmetric graded index profile under central defect, local fluctuations and single outer cladding are considered. It is supposed, the core diameter varies slowly along fiber length according to sine function. The period of sine function is more then 10⁶ times greater then fiber core diameter. Solution is based on proposed time domain model of piece-wise regular multimode fiber link under few-mode signal propagation under laser source exciting. Model takes into account differential mode delay, higher-order mode chromatic dispersion, mode mixing and power diffusion. Some results of pulse dynamics calculation during propagation over described fiber with periodical slowly varying core diameter are represented.

Optical characteristics of materials being in nanostructure condition are described. Possible versions of use of the detected spasmodic variation of a parameter of refraction of new materials are offered. The method of construction high-speed the optical switch, operated by variation of a parameter of refraction of a transparent optical material by means of additional radiation, or variation of parameters of the transferred signal is developed, allowing to make switching in time, compared in due course relaxations of substance.

We present a solution of the synthesis for reflective optical filters designed for WDM-systems. Filter is based on multilayer dielectric structures with apodized (modulated) refractive index profile. The method of synthesis provides calculation of the uniform quarter-wave filter-prototype. The calculation of the prototype is executed with relation, which join given spectrum characteristics with constructive parameters of the filter. On the base of calculated filterprototype the filter with bilateral Gaussian apodization of a refractive index profile, possessing given spectral properties is formed.

Optical multilayer selective mirror (OMSM) are widely used in different applications of fiber optic telecommunications. In this paper we represent the solution for synthesis of OMSM for constructing wavelength division multiplexing (WDM) optical filter used in add/drop multiplexers.

A method and device for all-optical bandpass and comb microwave filter synthesis is presented. Negative coefficients that are necessary to obtain bandpass filter are provided through a proposed method applied to a electro-optical modulator.

We propose a temperature measurement system based of fiber Bragg grating (FBG). FBG is applied as a sensor element, and a measurand is controlled in the finite number of points. For temperature registration and control of FBG reflection spectrum shift due to applied strain each sensor is tuned to a certain field of measured parameters. Strain response arose due to both to fiber prolongation, and corresponding changes of FBG period, and to changes of fiber properties from photoelasticity effect. Temperature response arose due to inner thermal expansion of fiber material and thermal dependence of refractive index. In present work for separation strain and temperature influence is proposed special sensor construction. Temperature sensor construction protects fiber with FBG from mechanical loads. Construction of reference strain sensor allows to reduce temperature influence at the expense of heat-insulating.

The article shows that the active medium injection into shielded evanescent waveguide structure significantly changes physical properties of the structure: this kind of waveguide has high gain even at low medium gain; cut-off frequencies for all types of waves and modes are absent, gain of the structure is higher for higher modes and increases at crosssection decrease of the waveguide structure. As an example, one can observe the parameters of rectangular and spherical waveguide.

The article shows that introduction of the active medium into shielded waveguide structure significantly influences on conditions of waves propagation through inhomogenuities: the section of evanescent waveguide structure allows to reach high gain at low medium activity. The article deals with waveguide boundary passage - evanescent waveguide, evanescent section passage of the final length.

Systematization is performed for the results of theoretical and experimental investigations that were obtained in radio physics and radio engineering with the help of fractal theory and the mathematical theory of fractional dimension and fractional operators with consideration for the scaling effects of real radio signals and electromagnetic fields. The methods are based on texture and fractal attributes with allowance for the scaling effects of real radio signals and electromagnetic fields. The main stages of creation of the first fractal nonparametric radar-signal detector and the principles of its construction are considered. The efficiency of the method is corroborated by numerous results of digital processing of optical, radar-natural, and synthesized images including soft ones.

Receiving of remote sensed data's signals in urban space information reception centers is usually difficult, because of complex electromagnetic situation in cities and insufficient EMC. Traditional methods for digital reconstruction of images use smoothing and autoregressive forecasting. In this case anomalous spikes on the image are lost. Alternative method based on Kolmogorov-Wiener's filters and fractal properties of satellite images is proposed in this article. Offered method allows to predict pixel values of satellite images with normalized RMS error of the order of 20-30%.

There is comparative analysis of methods for estimation and definition of Hoerst index (index of self-similarity) and comparative analysis of wavelet types using for image decomposition are offered. Five types of compared wavelets are used for analysis: Haar wavelets, Daubechies wavelets, Discrete Meyer wavelets, symplets and coiflets. Best quality of restored image Meyer and Haar wavelets demonstrate, because of they are characterised by minimal errors of recomposition. But compression index for these types smaller, than for Daubechies wavelets, symplets and coiflets. Contrariwise the latter obtain less precision of decompression. As it is necessary to take into consideration the complexity of realization some wavelet transformation on digital signal processors (DSP), simplest method is Haar wavelet transformation.

The way of realization of the nonlinear phase filters constructed on the basis of model in the form of generalized nonlinear Schrodinger equation in which it is considered dispersive effects of the maximum orders is considered.

In article experimental results increase attenuation in dependence of deformation optical buffer tube supply. Subsequent to the results of tests quantitative estimate increase attenuation in dependence of deformation optical buffer tube receive, calculate of the coefficients for allowed value deformation tube estimate.

We present results of attempts to apply a conventional fiber parameter field-test equipment for identification of multimode fibers with high differential mode delay (DMD). Backscattering traces, obtained by optical time domain reflectometer (OTDR) with the single-mode optical unit, and refractive index profile form, reproduced by image processing of lighted fiber end-face, were compared with pulse forms, registered by introduced DMD measurement system. Silica graded-index multimode fibers 50/125 of different generations were considered. Comparing results of high DMD fiber identification by OTDR, video diagnostics system and DMD measurement system are represented.

The article presents the results of cable reliability investigation, which takes place at laying out of technological margins, cable flexure at optical closure output for critical conditions. A possibility to carry out the optical cabling with closures in extreme conditions is shown. According to the investigation results we developed the recommendations on cabling with two types of closures and high rigidity cables.

Construction principles are considered for reflectometers with linear frequency modulated (LFM) subcarrier intended for monitoring of fiber-optic communication links. Analysis of energy characteristics for square-law photodetection regime of optical signals was fulfilled. The analysis of photoresistor operation under radio-heterodyning regime was fulfilled and practical schemes for reflectometry with linear frequency modulated subcarrier has been elaborated to realize advantages of continuous-wave sounding methods at infrared spectral band which is especially important for monitoring of fiber-optic communication links. The processes of backscattering signals accumulation were investigated for reflectometers with LFM subcarrier. Energy characteristics of reflectometers with LFM subcarrier were researched and large range of these systems (86.1 km) was confirmed for sounding beam power 1 mW.