Albert H. Sultanov

Simulation of polarization mode dispersion compensation based on EMTY-model and nonlinear optimization

There are two main approaches for the enhancement of data transfer rates in fiber-optical communication systems: by increasing the number of WDM-channels or simply by increasing the bit rate of each channel. At present, a key factor which restricts the date rate of WDM-channels is polarization mode dispersion (PMD). PMD has a significant influence on the signal quality at bit rates of more than 10 Gbps per channel. An adaptive optical compensator based on controlled birefringent elements for mitigation of higher order PMD is posed a challenging method. Using the EMTY model in combination with nonlinear optimization to adjust the compensator parameters leads to good results (in given test - average PMD value is reduced about 2,5 times) and can be used as basis of an algorithm for a reconfigurable optical compensator.

The approach to a segment construction for all networks with a switching mode, independent of the protocol

The approach to creation of the device ensuring function of switching, independent of the protocol, is considered. The device is of interest with construction completely of optical networks. The task of a presence of an interference picture in the complex profile resonator of a Fabry-Perot type is decided. The decision is carried out by numerical integration of the wave equation of the second order, and also developed simplified methods. The simplification allows to integrate the equation of the first order. The result for resonators of length up to 200 microns is received.

Information technology of remotely sensed optical image analysis on the basis of multiscale conceptions integration

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.

Method of the optical signal amplifying with distance pump and experience of its realization

The article is devoted to experimental study of a connection possibility of the EDFA amplifier to the fiber-optical communication line in conditions of joint transfer of a pump radiation and information DWDM-signal on single-mode fiber segment of certain length. The technique of realization of experiment is developed, the research experimental installation is assembled. The range of lengths researched of single-mode segment (accordingly, range of allowable potencies of a pump source) is revealed, where the transfer quality of the communication line at a level {{transfers of a voice}} PE < 10-6 and {{data transfer}} PE < 10-9 is ensured. The researches for a monochromatic information radiation (λ = 1550 nm) and WDM-signal (λ = 1550 nm and λ = 1310 nm) are conducted. The variant of use of the developed method of length regenerate plot magnification of a network on a really maintained fiber-optical network Open Joint Stock Company <> and Open Joint Petroleum Company {{Bashneft}} is considered.

Optoelectronic image processing system for satellite landmark navigation

Information system determining the satellite navigation parameters on the base of landmark image processing is considered. The concept of the optoelectronic navigation is based on the onboard optical correlator application for real time matching of the Earth images and prerecorded images of landmarks with known coordinates. The system is suitable for the low-orbit Earth imaging missions with 3-axis attitude stabilization and can be used for backup landmark navigation, precision pointing of the imaging payload and for onboard georeferencing of the obtained images. Mathematical model of the optoelectronic landmark navigation is considered. Compact optics design, the software and hardware models of the joint transform optical correlator have been developed. Experimental results obtained by using the image processing system are represented. The effects of the current image distortions on correlator performance were investigated. In the series of simulated experiments the accuracy of images matching was estimated in presence of image distortions and noise typical for high resolution Earth observation mission. The possibility to obtain the sub-pixel accuracy of images matching in real conditions under noisy environment is shown.

Fiber optic communication line segment containing amplifier EDFA

Present article is devoted to study of a connection opportunity of erbium-doped fiber (amplifier EDFA), to the fiber-optic communication line (FOCL) by means of a unique fiber. As a result of it powerful pump radiation and information radiation are transferred in common on singlemode fiber. Such way of connection EDFA to FOCL is of interest at operation of a transfer line on explosive objects and etc., where entering electrical and electronic components into the certain zone is not supposed. The numerical ratings of nonlinear effects influence on an information signal are carried out for a case: an information at DWDM-signal in a range 1530 ... 1560 nm, pump on a wavelength 980 nm. As a making fiber was considered standard single mode fiber with a step structure of a refraction parameter change such as SF. Among nonlinear effects the following are considered: nonlinear attenuation and refraction, modulation instability, compelled_scatterion on acoustic waves and parametrical processes. Is shown, that the basic limiting factor on a pump is the self-focusing capacity, limiting at the end length of a supplying fiber in limits up to two kilometers. On such length the influence of nonlinear effects appears insignificant, that does not worsen appreciable quality of transfer.

Fiber optic to radio-photonic equipment constructive principle for pipeline multiple defect monitor

This paper describes objectives on inner pipeline fault detection device modeling designated to monitor pipeline in real time. Due to high demands to high-speed and miniature measurements of such devices it is suggested to use implementations on the basis of fiber optic and radio-photonic mode of operation. A functional equipment design containing fiber optic generation and complex optic impulses transformation transmitted into radio trunk circuits are developed. Physical implementation of the suggested model is estimated as well as an analytical model for propagation of pilot signal on the basis of the Maxwell system of equations for partially conductive and simultaneously scattering medium.

All-optical interface objectives for heterogeneous segments and suggested synchronization circuit

This article is dedicated to interface devices for all-optical synchronization of optical backbone and subscriber line network segments. It is obvious that this type of devices must be all-optical. Due to the importance of phaselock loop (PLL) circuits essential for each telecommunication device an all-optical circuit has been suggested which fundamental principle of operability is in phase cross-modulation effect between tuned and strobe optical signals. Physical parameters of the circuit and time of PLL execution have been calculated. It is shown that this response time is suitable for highspeed devices.

The radio-photon method of forming directional radio emission in a wide frequency band

The task of the antenna array radiation pattern optical control for ultra-wideband radio emission is considered in the paper. A fiber-optic phasing scheme is proposed, which is part of a complex fiber-optic device. The control device layout and the radio-photon segment layout photos are presented. An analytical model of the optical phasing process is developed that provides the frequency bands number calculation. The number of bands, on which a wide frequency range should be divided, depends on the permissible level of the array radiation pattern distortion. The results of experimental approbation of the radio lobe phasing control in the frequency band of 200 MHz, divided into 3 subbands of 70 MHz, are presented.

Chirped optical signal application methods in fiber optic radio-photonic communications

The paper considers the study of chirped optical signal application methods in perspective optical networks: RoF, PON and MAN categories. The principle of obtaining chirped optical pulses due to Mach-Zehnder chirping modulator control modes selection is proposed. A mathematical model is developed. It is shown that iterative selection of corrective chirp function is possible. The experimental approbation of the proposed principle is performed. It is also shown that the chirp function can be used to design all-optical network control devices.