We have recently proposed a single-shot phase detection method in holographic data storage system. A phase-modulated signal can be retrieved from information of embedded known-phase pixels and intensities at pixel boundary where the diffracted waves from adjacent pixels interfere with each other owing to the inter-pixel crosstalk. So far, we have confirmed the validity of our proposed method numerically and experimentally. In this presentation, we report on our recent progress on this method.

In see-through head-mount displays such as AR display, lightweight characteristics are required for long-term use. In addition, large field of view and large eye-box are important as characteristics of head-mount displays. However, it is difficult to realize these characteristics simultaneously. To realize the characteristics, it is proposed that a cylindrical volume holographic optical element (CVHOE) is used as a waveguide for AR displays. In CVHOE, a cylindrical wave is diffracted as a plane wave. By using the CVHOE, multiple cylindrical waves can be transformed into multiple plane waves with different wave vectors. When pixels of a image is regarded as point sources, the point sources can be transformed into cylindrical waves. Therefore, point sources that consist of an image can be transformed into plane waves by using a cylindrical lens and CVHOE. By looking the CVHOE, the original point sources are imaged on a retina. Then, large eye-box can be achieved because of plane waves. Furthermore, large field of view can be enlarged by adjusting the diffraction angle of CVHOE. In this system, there is a characteristic that a CVHOE for a full-color display can be prepared by using a monochromatic light source. However, many times exposure are required in high-definition display. In this study, numerical simulation was performed to decrease the number of exposures. The method is based on perturbation theory in Maxwell’s equations. The diffraction properties of CVHOE were evaluated by the numerical simulation.

Polarization holography has great potential in Ultra-high-definition (UHD) information diplay and data storage. Due to the faithful reconstruction in polarization holography, the storage capacity is further improved easily. In this paper, a device for generating vector vortex beam is demonstrated using the faithful reconstruction characteristics. Through the analysis of the experimental results, it is found that the helical phase order corresponding to different polarization states is different in the transmission process. It shows the independence of vector vortex beam propagation. This method has a certain research space in optical storage, and application prospect in optical micromanipulation optical tweezers.

Based on tensor polarization holography, the variation of exposure response coefficient with the increase of exposure energy under different recording process is introduced in this paper. We find that different recording processes have different effects on the exposure response coefficient. However, at the beginning of exposure, there is an initial value of the exposure response coefficient independent of the holographic recording process. With this special phenomenon, polarization modulation of reconstructed wave can be easily realized at low exposure energy, such as faithful reconstruction, orthogonal reconstruction and null reconstruction.

Phase-modulated holographic data storage shows a great prospect in Ultra-high-definition (UHD) information display and data storage due to its higher capacity than amplitude modulation. However, the phase reconstruction is more sensitive to noise in the spectrum plane. In this paper, we proposed to use the low-depth camera to obtain the spectral intensity of the reconstructed beam, and used iterative Fourier transform algorithm to retrieve phase. Simulation and experiment show that this method has stronger noise suppression performance.

A graded-index plastic optical fiber (GI POF) is a promising optical cable for indoor networks because of its flexibility, safety, and high bandwidth. Recently, we proposed a low-noise GI POF utilizing the strong mode coupling due to the distinctive microscopic heterogeneities in the core polymer material. This will facilitate the proliferation of noise-sensitive radio-over-fiber (RoF) transmission and multilevel pulse-amplitude modulation (PAM), which are vital for ultra-high-definition (UHD) media transmission in indoor networks. Here, we introduce the recent progress in the GI POF technology for next-generation indoor networks in the upcoming UHD era.

Optical communication is widely applied and continues evolving. Embedded optics is focused on by a lot of companies for datacom application. Then some associations have started to discuss implementation of it as COBO (On-Board Optics), CPO (Co-packaged Optics) and NPO (near package Optics). Even in consumer application, Active Optical Cable (AOC) is gradually utilized for TVs and head mount devices. These trends require that the optical transmission products must have better performance and be more user friendly. In this presentation, I would like to introduce a new plastic optical fiber (POF) and an optical waveguide with a flexible printed circuit (OFPC) both of which Nitto has been developing. They can contribute higher data rate including multi-level modulation, stronger against bending, downsizing modules and higher density optical packages.

Ultralow threshold near-infrared light-induced self-written waveguides were realized at wavelengths of 1.31 μm and 1.55 μm. VCSEL-to-fiber and silicon waveguide-to-fiber self-couplings were successfully demonstrated.

Various HMDs and AR glasses have currently been available in the market. Because they enable 3D, life-sized, and frameless presentation, they have a good potential to be a third terminal to watch video contents after TV set and smartphone. Science & Technology Research Laboratories (STRL) belongs to public broadcaster NHK and has been making some trials for media services using AR/VR technologies. In this talk, parts of our trials including 360° VR image system for comparative views, capture/display system for VR images with extremely high resolution, and space-sharing content viewing system using AR/VR are introduced to find the possibilities to make AR/VR technologies for the future media.

The random depolarization film (RDF) randomizes polarization of the light and resolves blackout and color change problems of existing displays. The RDF consists of a polymer film doped with birefringent particles such as calcite; however, the dopant particles slightly scatter the light, which degrades the image sharpness. In this study, we improve the image sharpness using RDF designed by focusing on the birefringence and particle size of the dopants. Furthermore, the RDF achieved chromaticity changes of less than human eyes can recognize because it showed various interference colors with maximum retardation of 600 nm.