As a new category of the optical application system integrated with electronics, the opto-electronic information system (OEIS) is presented. Combination of the different characteristic technologies, optics and electronics, is expected to be useful for development of an effective and high-performance information systems. The properties of the optical technologies such as parallelism, high-speed, and large information capacity can be utilized for information processing. Even if some of the functions are emulated by the electronics, the optics give more effective solutions. To implement the OEIS, various optoelectronic devices and fabrication technologies are available including vertical cavity surface emitting lasers and spatial light modulators. There are two forms of system construction for the OEIS: an application of optics to an electronic-based system and the reversed form. As examples of the OEIS, the parallel matching architecture (PMA) and the thin observation module by bound optics (TOMBO) are presented. The PMA is an architecture of parallel computing system specified for global processing. This architecture shows a typical strategy to utilize the optical interconnection capability with flexibility of the electronic technology. The TOMBO presents possibility of morphological conversion using combination of the optical and electronic technologies. A compound-eye imaging system and post digital processing enable us to realize a very thin image capturing system. The issues related on development of the OEIS are proper usage of optics, effective fusion of the optical and electronic technologies, methodologies for system construction, fabrication supporting tools, and development of attractive demonstrators other than communication and interconnection fields.

The visual reality of a holographic image has improved effectively by utilizing multicolor reconstruction procedure. This fact is applicable to a real-time three-dimensional display for a computer generated hologram (CGH). However, it is quite difficult to generate a CGH for multicolor imaging in real-time because a CGH contains essentially a huge amount of information, and increases further information produced by multiplying the number of primary colors for multicolor imaging. Moreover, the optical system is considerably complicated for the multicolor image reconstruction. In this paper, a new method is presented to reconstruct a three dimensional multicolor image from a CGH. In this method, three sub-holograms to reconstruct the primary color images are sampled respectively for reducing the amount of computation and realizing a simple optical system. Fringe patterns are displayed by only one spatial light modulator (SLM) and color crosstalk images are eliminated by a color filtering system for ensuring that each sub-hologram can be only illuminated by the light with an appropriate color. A multicolor imaging method from a CGH is proposed and also the experimental results are shown.

In this letter, we reveal redundant control traffic in the optimized link state routing protocol (OLSR) for MANET. Topology control (TC) messages, which occupy a part of control traffic in OLSR, are used to exchange topology information with other nodes. TC messages are generated and forwarded by only nodes that have been selected as multipoint relays (MPRs) by at least one neighbor node. These nodes selected as MPRs are called TC message senders in this letter. One of solutions to reduce the number of TC messages is to reduce the number of TC message senders. We describe a non-distributed algorithm to minimize the number of TC message senders. Through simulation of static-node scenarios, we show 18% to 37% of TC message senders in RFC-based OLSR are redundant. By eliminating redundant TC message senders, the number of TC packets, each of which contains one or more TC messages, is also reduced from 19% to 46%. We also show that high density scenarios have more redundancy than low density scenarios. This observation can help to consider a cooperative MPR selection in OLSR.

The rapid growth of the Internet impacts ATM networks to be furnished IP handling capability. This paper discusses networking issues for IP and ATM integration. First, it considers function allocation at the boundary of an ATM backbone network and the Internet. As the result, the paper explains the necessity of built-in IP handling capability into an ATM switching system, and summarizes functional requirements for the system architecture. According to the discussion above, the authors propose the system architecture of the IP/ATM integration in the ATM switching system. The implementation of the proposed architecture is evaluated, and the wire-speed IP handling capability in the ATM switch is confirmed.