This PDF file contains the front matter associated with SPIE Proceedings Volume 7026, including the Title Page, Copyright information, Table of Contents, Introduction (if any), and the Conference Committee listing.

Applying direct error counting, we assess the performance of 20 Gbit/s wavelength-division multiplexing return-to-zero differential phase-shift keying (RZ-DPSK) transmission at 0.4 bit/(s Hz) spectral efficiency for application on installed non-zero dispersion-shifted fibre based transoceanic submarine systems. The impact of the pulse duty cycle on the system performance is investigated and the reliability of the existing theoretical approaches to the BER estimation for the RZ-DPSK format is discussed.

High level of optical radiation in optical fiber due to utilization of optical amplifiers causes an interaction of strong electromagnetic field with fiber core material. As a result of this interaction different nonlinear effects in optical fiber may occur. In this paper FWM effect is investigated. Methods that can be used to reduce deteriorations caused by this type of nonlinear interaction between optical signals and fiber core material are researched. Suggested FWM reducing system is presented.

Fiber optic telecommunication systems with duplex data transmitting over single fiber require reflection minimization. Moreover reflections may be so high that causes system deactivating by misoperation of conventional alarm, and system can not automatically adjudge the collision, so operator manual control is required. In this paper we proposed technical solution of mentioned problem based on additional analysis subsystem, realized on the installed Ufa-city fiber optic CTV system "Crystal". Experience of it's maintenance and results of investigations of the fault tolerance parameters are represented

Method of material dispersion account for calculation of optical fiber chromatic dispersion is presented. Calculation of chromatic dispersion slopes for fibers with refractive index profiles, for which analytical decisions and experimental data of chromatic dispersion slopes are known, is performed by an offered method and using traditional method. On the basis of the comparative analysis the estimation of adequacy of the offered method is given.

Design of differential mode delay (DMD)-compensating silica GeO₂-doped graded-index multimode fibers with reverse DMD, or so-called reverse DMD fibers (RDMDFs), is presented. DMD-compensating is based on assumption, that initial array of excited mode group velocities of compensated fiber should be reversed in reference to the slowest mode. It is proposed to obtain effect of reverse DMD by fiber profile optimization. Objective function is represented as a sum of squares of deviations between points, corresponding to radial mode orders, of ideal desired reverse group velocity diagram and diagram of current iteration. An extension of modified Gaussian approximation generalized for any order guided mode, propagating along weakly guiding optical fibers with an arbitrary axial-symmetric refractive index profiles, was developed to apply for design RDMDFs. Solution based on proposed method is described. Results of RDMDF design are presented, including optimized refractive index profiles and comparing results between desired ideal mode group velocity diagram and distribution of velocities between guided modes propagating along designed RDMDF.

Set of coupled nonlinear Schrodinger (NLS) equations for wave-division multiplexing (WDM) system group signal propagation in dispersion-managed (DM) optical fiber links is considered. Solution of this set of NLS equations by variational method is represented.

In the given article research of calculation errors, caused by modeling of fiber refractive index profile by ideal step index function with discontinuity on an bound of layers, for parameters of spectral characteristics for the step index optical fibers are performed. Conclusion of expressions for corrections is described. Errors of estimations for chromatic dispersion parameter and zero wavelength depending on kind of smoothing function and smoothing parameter are resulted.

The paper contains the results of simulation of Raman optical amplifiers with copropagating and counterpropagating pumping. The computer program was developed to calculate signals and noise of amplified spontaneous emission for various lengths of amplifier sections. The various applications of optical amplifiers allowing to increase regenerator section length are considered. The results of calculations are of interest to the designers of long-haul fiber-optic communication systems.

The transformation of one-dimensional distributions of stationary and non-stationary casual processes to nonlinear parts of nonlinear phase filters (NPF) is considered.

In this article it is shown that Helmholtz equations describe a special case of spherical symmetric fields of the electromagnetic field from the whole range of vortical fields. The author considers the solution of the wave equation and shows that Helmholtz equations give a good approximation for spacially 1-D and 2-D structures. However, they give quite different results under the analysis and calculations for 3-D structures.

A new simulation method for optical pulse distortion in macro-bends of single-mode optical fiber with coating layer is presented. The pulse distortion in macro-bends of standard single mode fibers are investigated theoretically, showing that the pulse distortion in macro-bends can make bit errors for optical communication systems with high bit rate. The simulation technique is validated by comparison with exact solution for macro-bend losses of standard single mode fiber.

Fractal approach to mathematical modelling of signals in space optical observation systems is proposed. The scannings of two-dimensional images as one-dimensional stochastic fractal processes are built on the base of Brownian motion. Integrals over trajectories of Wiener processes with different kernels are used for modeling of one-dimensional stochastic fractals and multifractals. Modelling of scannings of remotely sensed data based on formalism of integrals over Wiener stochastic process trajectories and modelling of probabilistic characteristics based on formalism of Feynman continual integrals are performed. Algorithms of multiscale detection of signals on the basis of discrete and continuous wavelet transforms are developed and applied for anomaly detection and estimation.

There is methodology of multiscale compression for satellite images in article. This methodology based on system integration multiscale signal's analisys concepts. This system use quasicontinuous scannigs of Peano-Hilbert, discrete wavelet transforms and fractal sets.

In article the method of the decision of a problem of diffraction of an electromagnetic field of an element of an electric current by the spending screen, based on data of an initial regional electrodynamic problem to system of Fredholm integral equations of the second kind, which numerical solution is spent with use of original wavelet-basis is considered. The given problem arises at the electrodynamic analysis of antenna systems of wireless sites of optical networks of data transmission.

For effective analysis of optical signals it is important to obtain the parameters of their structural properties, variation coefficient, excess, asymmetric coefficient can be used for this purposes. The use of variation coefficient is being possible when at comparatives analysis of structurally similar signals. That in why the variation coefficient would be implied at structural analysis of optical signals in the same intervals found. There are properties of factors variations of distributions probabilities critically investigated for their use in applied problems of the statistical analysis. Their greatest information is shown for structural properties of distributions of modules of a deviation from an average values of investigated laws of distributions.

Some non conventional methods of model identification based on data normalization are presented in the article. The method of Data Normalization can be effectively used in those fields of industry optical engineers and technology processing of optical signals, which suffer from factual difficulties while gathering experimental data. The named method helps to receive information about some tendencies and regularities in process and objects dynamics, identify similarities and differences of their structure, their quantitative estimations, to provide the statistical explanation of experimental data and real-time analysis.

In paper methodological aspects of symmetric double frequency reflectometry system for fiber Bragg structure control are discussed. Amplitude phase conversion method for forming double frequency oscillations from harmonic signals is proposed. This method is based on the fact that phase modulation with certain indexes could decrease an amplitude of initial frequency and produce two symmetric side lobes. Basics of amplitude phase conversion of coherent single frequency radiation to double frequency and its distinguished features of frequency-shifted spectral components symmetrical position relatively suppressed frequency of initial radiation, high level of spectral purity, stable output radiation, and high conversion ratio are illustrated. Information structure of symmetric double frequency signal is also considered.

In paper metrological aspects of symmetric double frequency and multi frequency reflectometry for Bragg structures are considered. Basics of this method is amplitude phase conversion of coherent single frequency radiation to double frequency and its distinguished features are frequency-shifted spectral components symmetrical position relatively suppressed frequency of initial radiation, high level of spectral purity, stable output radiation, and high conversion ratio. In paper are considered the metrological aspects of following systems: a) symmetric multi frequency reflectometry system for Bragg structures control, and b) symmetric double frequency reflectometry system for Bragg structures.

The algorithm of estimation of local lateral stress-induced birefringence in an optical fiber is represented. Results of calculation of mechanical stress and birefringence in an optical fiber under lateral stress are resulted.

In article results of experimental researches of resistance to optical cable bends on an output from closure port are submitted. The test data optical cable with increased inflexibility in extreme conditions are resulted. Recommendations on increase of resistance to small radiuses bends for of optical cables on an output from closure at the lowered temperature are considered.

In this paper experimental research results on ability of localization high-birefringence sections using POTDR based on standard OTDR are presented. Different method of POTDR reflectograms analysis are compared and conclusions about criterion of application was made. Algorithm of POTDR traces processing for localization was developed.