The possibility of using Bragg reflection in a cylindrical fiber to obtain lossless confined propagation core with lower refractive index than that the cladding medium is proposed and analyzed.

We describe an all-optical associative memory system that uses a holographic data base. Phase-conjugate mirrors are used to provide optical feedback, thresholding, and gain. Analysis preliminary experiments discussed.

It is shown that twisted nematic liquid-crystal spatial light modulators behave as phase-only when operated below the conventional optical threshold. Thus such devices, in a reflection mode, amplitude used between crossed polarizers above threshold; they phase parallel and

Depth estimation from a single image is well-known challenge in computer vision. With the advent of deep learning, several approaches for monocular depth have been proposed, all which inherent limitations due to scarce cues that exist image. Moreover, these methods are very demanding computationally, makes them inadequate systems with limited processing power. In this paper, phase-coded aperture camera proposed. The equipped an optical phase mask provides unambiguous depth-related color...

Modern consumer electronics market dictates the need for small-scale and high-performance cameras. Such designs involve trade-offs between various system parameters. In such trade-offs, Depth Of Field (DOF) is a significant issue very often. We propose computational imaging-based technique to overcome DOF limitations. Our approach based on synergy simple phase aperture coding element convolutional neural network (CNN). The element, designed extension using color diversity in imaging...

We describe a shift-invariant all-optical holographic associative memory implemented using phase conjugate mirrors and Fourier transform holograms. A key feature of our system is the large storage capacity obtained through use nonlinearities in correlation domain. The angularly multiplexed plane wave reference beams allows access to domain where can be used reduce greatly crosstalk noise.

The analysis of parallel waveguides can be performed either by expressing the coupling energy between individual, primary guides (coupled-mode approach) or directly analyzing a structure consisting all and their surrounding media (normal-mode approach). A comparison these two approaches, as well derivation relations enabling conversion data, when possible, from one approach to other, are presented in this paper. Finally, results used investigate dependence coefficient on spacing guides....

An analysis of holographic interferometry using two reference beams to record and reconstruct the interfering light fields independently is carried out. The multiplicity reconstructions discussed. Guidelines for recording setup are derived separate wanted from unwanted reconstructions. influence misalignment hologram waves on fringe pattern in image evaluated detail. It shown that by proper choice experimental arrangement, two-reference-beam holography can safely be used quantitative...

Operation and design considerations are described for a general class of symmetric directional coupler switches. Performance limitations discussed in terms asymmetries. Comparisons made between various waveguide electrode geometries. Measured devices operating at <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\lambda = 0.83 \mu</tex> m have V <inf xmlns:xlink="http://www.w3.org/1999/xlink">π</inf> voltage length product under 30 mm an...

In this paper we present a new approach for obtaining all-optical axial super-resolving imaging by using non-diffractive binary phase mask inserted at the entrance pupil of an lens. The designed element is tested numerically and experimentally on various practical testing benches eventually into lens cellular phone camera.

More than 50 years ago, B. Lyot and later on I. Solc introduced new types of optical filters called birefringent filters. Such take advantage the phase shifts between orthogonal polarization to obtain narrow band It requires wave plates for introducing retardation two components a linearly polarized light that correspond fast slow axes material. In this paper we present methods architectures generalize Lyot-Ohman optimally synthesizing an arbitrary all-optical filter by defining error metric...

We describe the experimental realization of an all-optical imaging system with extended depth field (DOF). The core is a phase mask consisting 16 Fresnel lenses (FLs) that are spatially multiplexed and mutually exclusive. Because each FL, in tandem primary lens, designed to produce sharp image for specific object plane location, jointly FLs achieve wide DOF. However, resultant exhibits reduced resolution. acquired image, onto which we did not apply any postprocessing, clearly sharper than...

We present experimental results from an all-optical associative memory that combines holography and phase conjugation. The device has the capability to recall a complete image when merely portion of stored is input system. Multiple superimposed two-dimensional images with gray scale can be recalled. In addition, we have demonstrated system's invariance translation images.

A waveguide geodesic lens formed in a single-mode Ti-diffused LiNbO3 is reported. The paraxial focal length of the fabricated was 1.1 cm. In addition, novel technique for ultrasonic impact grinding profiles arbitrary shape developed. paper describes first substrate.

A directional coupler consisting of three parallel waveguides is analyzed. The radiation coupled between the two external guides, while center-guide refraction index controls coupling. By means a coupled-mode analysis, cross-and-bar diagram drawn for device, and regions are located in it near-complete energy transfer guides. rigorous mode analysis presented three-guide layered structure, radiation-transfer process numerically simulated single-mode as well highly multimode Although carried...

An optical configuration is described that uses an addressable reflective component (a liquid-crystal light valve) permitting free-space interconnections between points located on the same substrate. The scheme attractive for generating programmable electronic elements chip or wafer, in particular since it highly resistant to system misalignment. Experimental results indicating a fan-out capability, which desirable clock signal distribution, are presented.

The design of a circularly symmetric hybrid imaging system that exhibits high resolution as well extended depth field is presented. design, which assumes spatially incoherent illumination, searches for an optimal "binary amplitude and phase" pupil mask, certain desired field, provides the largest spatial frequency band assures contrast value. captured images are electronically processed by off-line Wiener filter, to finally obtain quality output images. Simulations experimental results provided.

Two multimode optical fibers connected mutually at several locations along their lengths can act as an encoding or decoding structure depending on which terminals are used for the input/output of data. It is shown that two multicoupled lines have one input acts matched filter another input, thus enabling easy correlation data in real time. The performance such a was simulated digital computer and results discussed.

A liquid crystal area detector has been used to make microwave holograms at 35 GHz. The were photographed and the original images reconstructed using laser light.

In a previous work done by the authors, it was shown that superresolution concept based on two moving gratings could be effected physical grating attached to object and virtual grating. This very efficient exhibited features are helpful in removing some artifacts caused when coherent illumination is used. Furthermore, simplifies optical mechanical modules of super-resolving system need for movement one However, still required first (encoding) input. this study encoding replaced use projected...

A novel algorithm for the design of an imaging system that exhibits high resolution as well extended depth field is presented. This approach searches optimal pupil mask minimizes value mean-square error when performed over intensity rather than in distribution acquired image. The captured images such do not require any postprocessing, and thus utilization a simplified. Simulations experimental results are provided.