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Investigation of Differently Modulated Optical Signals Transmission in HDWDM Systems

Computer Technology and Application 2011年第10期2卷 801-812页

作者： Aleksejs Udalcovs Vjaceslavs Bobrovs girts ivanovs Institute of Telecommunications Faculty of Electronics and Telecommunications Riga Technical University Riga LV-1048 Latvia

The authors’ developed combined system model can be considered under the concept of next generation optical network (NGON) as a model for the future design of backbone networks. Such solution can be topical in the result of different telecom operators’ optical networks convergence. In this case a necessity to transmit differently modulated signals over a single optical fiber even with different bit rates may occur. This research is performed with OptSim 5.2 simulation software that numerically solves nonlinear Schr?dinger equation. The authors have revealed the optimal parameter configuration for developed combined transmission systems and obtained in system’s channels detected signals bit-error-rate (BER) correlation diagrams. They represent BER as a function from different system’s parameters such as channel output power level, optical amplifier fixed output power level and system’s channels allotment in C-band of ITU-T (Telecommunication Standardization Sector of the International Telecommunications Union) recommended spectral grid. As well as these obtained BER values were compared with the results for similar system, where instead of standard single mode fiber (according ITU-T Rec. G.652 D) optical signals are transmitted over non-zero dispersion shifted fiber (ITU-T Rec. G. 655).

关键词： DWDM系统光信号传输调制信号非线性薛定谔方程电信运营商国际电信联盟标准单模光纤光纤传输

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Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

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Optics and Photonics Journal 2014年第6期4卷 143-152页

作者： Andris Ozols Valdis Kokars Peteris Augustovs Dmitrijs Malinovskis Kaspars Traskovskis Elmars Zarins girts ivanovs Faculty of Electronics and Telecommunications Riga Technical University Riga Latvia Faculty of Material Science and Applied Chemistry Riga Technical University Riga Latvia

Self-enhancement (SE) effect of scalar and vector holographic gratings (HG) recorded in three different azobenzene molecular glassy films is experimentally studied in both transmission and reflection modes at 532 and 633 nm. The maximal SE factor (the ratio of diffraction efficiency to its initial value) SEF = 42 has been achieved. It is shown that the model of complementary HG can be applied also in scalar transmission thin HG case to explain coherent SE. The possibility of vector HG coherent SE in transmission mode is experimentally demonstrated for the first time (SEF = 4.3). The possibility of coherent HG SE in reflection mode is also established for the first time (SEF = 21). HG recording processes as well as coherent SE processes are found to be independent in transmission and reflection modes being determined by volume and surface relief HG, respectively. The permittivity gradient mechanism is proposed to explain the coherent SE of surface relief HG. Both HG recording and coherent SE efficiencies strongly decrease when HG period is decreased from 2 mm to 0.5 mm. No relaxational SE effect is found. Coherent SE effect in molecular glasses is found to be weaker than in inorganic materials.

关键词： Self-Enhancement of Holograms Light Polarization Holographic Gratings Azobenzene Molecular Glasses

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