This thesis is devoted to the study of fiber-optic communication systems that mitigate nonlinear distortion due to the Kerr effect by transmitting a phase-conjugated copy alongside the signal followed by coherent superposition. This kind of communication systems are referred to as phase-conjugated twin waves systems when the phase-conjugated copy is transmitted on the orthogonal polarization. T...

Electro-optic sampling has emerged as a new quantum technique enabling measurements of electric field fluctuations on subcycle time scales. In second-order nonlinear material, the terahertz are imprinted onto polarization properties an ultrashort probe pulse in near infrared. The statistics this time-domain signal calculated, incorporating nature involved fields right from beginning. A microsco...

abstract background and aim: consider ing based on the presence or absence of swelling of the optic disc, optic neuritis classified nto two types of anterior and retrobulbar optic neuritis. the aim of this study was to compare the visual functions of patients with anterior optic neuritis and retrobulbar optic neuritis. materials and methods:this cross-sectional study was conducted in 48 patient...

The past decades have shown an ever-increasing demand for high-rate Internet services, motivating a great effort to increase the spectral efficiency of optical networks. In general, fiber-optic links are non-Gaussian, and in contrast to additive white Gaussian noise (AWGN) channels, there is no standard framework for quantifying fundamental limits or designing capacity-approaching coding scheme...

Abstract In the framework of a mesoscopical model for dielectric media we provide an analytical description electromagnetic field confined in cylindrical cavity containing finite sample. This system is apted to simulate optic fiber, which two different regions, vacuum region and one, appear. A complete scattering basis introduced, together with quantization two-point function. Furthermore, also...

Herein, the main aspects of fiber lasers are summarized where multimode interference (MMI) is underlying phenomenon for wavelength tuning mechanism. Also, 15 years work in field covered, from its first report, 2005, to most recent publications, 2020. In addition historical perspective, insights into different mechanisms also provided that exploited tune spectral response MMI filters used lasers...

We consider thermo-optic hysteresis in a silicon structure supporting bound states the continuum. Taking into account radiative heat transfer as major cooling mechanism we constructed nonlinear model describing optical response. It is shown that can be obtained with low intensities of incident light ${I}_{0}\ensuremath{\approx}1\phantom{\rule{0.16em}{0ex}}\mathrm{W}/{\mathrm{m}}^{2}$ at red edg...

Lithium niobate (LN) has experienced significant developments during past decades due to its versatile properties, especially large electro-optic (EO) coefficient. For example, bulk LN-based modulators with high speeds and a superior linearity are widely used in typical fiber-optic communication systems. However, ever-increasing demands for signal transmission capacity, the power size of device...