Multi-party collaborative environments based on AG (Access Grid) are extensively utilized for distance learning,
e-science, and other distributed global collaboration events. In such environments, A/V media services play
an important role in providing QoE (quality of experience) to participants in collaboration sessions. In this
paper, in order to support high-quality user experience in the aspect of video services, we design an integration
architecture to combine high-quality video services and a high-resolution tiled display service. In detail, the
proposed architecture incorporates video services for DV (digital video) and HDV (high-definition digital video)
streaming with a display service to provide methods for decomposable decoding/display for a tiled display
system. By implementing the proposed architecture on top of AG, we verify that high-quality collaboration
among a couple of collaboration sites can be realized over a multicast-enabled network testbed with improved
media quality experience.
KEYWORDS: Scalable video coding, Video, Visualization, Video compression, Local area networks, Displays, Human-machine interfaces, Silver, Distributed computing, Video processing
In this paper, we propose a scalable visualization system to offer
high-resolution visualization on multiparty collaborative environments. The proposed system treats with a coordination technique to employ large-scale high-resolution display system and to display multiple high-quality videos effectively on systems with limited resources. To handle these, the proposed system includes the
distributed visualization application under generic structure to enable high-resolution video format, such as DV (digital video) and HDV (high definition video) streaming, and under decomposable decoding and display structure to assign the separated visualization
task (decoding/display) to different system resources. The system is
based on high-performance local area network and the high-performance network between decoding and display task is utilized as the system bus to transfer the decoded large pixel data. The main focus in this paper is the decoupling technique of decoding and display based on high-performance network to handle multiple high-resolution videos effectively. We explore the possibility of the proposed system by implementing a prototype and evaluating it over a high-performance network. Finally, the experiment results verify the improved scalable display system through the proposed structure.
We report the use of amorphous silicon (a-Si) and hydrogenated amorphous silicon (a-Si:H) overlays to fabricate low-loss distributed Bragg reflectors (DBRs) for active and passive glass waveguide devices. Overlay material issues, overlay DBR design procedures, and fabrication details are presented. We apply the technology to implement a multiple-wavelength source using an array of overlay DBR waveguide lasers on a single Er/Yb doped, ion exchanged, glass substrate. The lasing wavelengths of the laser array are linearly related to the width of the ion-exchange mask openings. One laser with a 8.5 mm long gain section and a 1.5 mm long overlay DBR had a launched pump power threshold of 29 mW and a 8.5% slope efficiency. We also fabricated a Mach-Zehnder-based, ion exchanged, glass waveguide, optical add-drop multiplexer (OADM) using an a-Si overlay DBR. The 3 cm long OADM exhibited a 24 dB transmission dip with a 3 dB bandwidth of 0.5 nm at the drop wavelength. The throughput loss of the OADM, excluding input and output coupling losses, was approximately 1.9 dB. Theory and measurement results are in good agreement for both the laser array and the OADM.
We have analyzed the Stokes Parameter Receiver for the PoISK by the Monte Carlo simulation of the Symbol Error Rate and the noise perturbation effect. The optical signal constellation is optimized on the basis of the simulation. Optimizations by the existing theory are examined and compared with the simulation results.
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