Abstract-An all-optical neural network is presented that is based on coupled lasers. Each laser in the network lases at a distinct wavelength, representing one neuron. The network status is determined by the wavelength of the network's light output. Inputs to the network are in the optical power domain. The nonlinear threshold function required for neural-network operation is achieved optically by interaction between the lasers. The behavior of the coupled lasers is explained by a simple laser model developed in the paper. In particular, the winner take all (WTA) neural-network behavior of a system of many lasers is described. An experimental system is implemented using single mode fiber optic components at wavelengths near 1550 nm. A number of functions are implemented to demonstrate the practicality of the new network. The neural network is particularly robust against input wavelength variations.

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Performance and efficiency of multiple processor computers depend strongly on the network that interconnects the distinct collaborating processors. Constrained connectivity forces much of the potential computing speed to be used to compensate for the limitation in connections. The availability of a multiple parallel I/O connections allows full unrestricted connectivity and is an essential prerequisite for an interprocessor network that is able to meet the ever growing communication demands. This paper emphasizes the design, building and application of an electrooptic communication system [EOCS]. The EOCS uses dedicated free space multiple data distributors and integrated optically writable inputbuffer arrays with fully parallel access.

Communication between computing systems is recognized as the main limitation to increasing the speed of all-electronic systems beyond levels currently achieved in existing supercomputers. Optical interconnects hold great promise in eliminating current communication bottlenecks because of properties that stem from optics inherent parallelism. Wavelength-division multiplexing (WDM) technology, by which multiple optical channels can be simultaneously transmitted at different wavelengths through a single optical transmission medium is a useful means of making full use of optics parallelism over a wide-wavelength region. In this talk, we review the working principles of wavelength division (de)multiplexers (WD(D)M) for optoelectronic interconnection in high-throughput optical links and address the optical design issues of WD(D)Ms. Several grating-based WD(D)M structures are analyzed. We report experimental data for several versions of WD(D)Ms which exhibit low insertion loss, high reliability, and low cost.Key words: WDM, optoelectronic interconnect, optical interconnect, fiber optics, optical link, high throughput link 1.INTRODUCTIONThere is a broad consensus that major discoveries in key sciences would be within reach if computers were far more powerful that today's conventional supercomputers. Only massively parallel processors are eligible to provide teraflops of computing power in solving problems containing trillions of data points and accessing terabytes of data. Such teraflop performance, derived from the product of the number of processing nodes and the processing power of each node, can be achieved both through the use of large numbers of nodes and from fundamental improvements in hardware technologies and the communication among algorithms. In enhancement of the processing power of the node and the density of nodes in ULSI and massively parallel processing, the communication congestion may arise in electric interconnection for exchange information inter-and intra-nodes. The problems met by electric interconnection in ULSI and massively parallel processor have the following a few aspects: A. The limitation of RC time constantIn order to enhance the density of devices integrated on a ULSI chip, all the dimensions, as well the voltage and currents on the chip are supposed to be scaled down by a factor α. It is obvious that the number of devices that can be placed on a chip of given size scale up by squared α. In addition, the power dissipation per device and the switching delay are decreased by a factor α. However, the RC time constant and the interconnect delay between the devices remain unchanged due to increase of the interconnect resistance and decrease of the distribution capacitance by the same factor α. So, it is clear that since gate delays decrease with scaling while interconnect delays remain constant with scaling, eventually the speed at which a circuit can operate is dominated by interconnect delays rather than device delays. B. The problem of clock skewMost computing architectures require...

In this paper, a novel type of red sensitive photo-polymer system for optical storage, here called RSPP, is presented. First of all, the components in RSPP, for example, photo-sensitizer, photo-initiator, monomer, copolymer, combiner, stablizer, hardener, and fabrication and processing technique of RSPP are given. Then, the absorption spectrum of RSPP material is measured. And the result shows the material is only sensitive to read light, whose absorption peak is at 662nm and half-width of the absorption is about lOOnm. After that, the property of exposure in RSPP is studied. It is found that RSPP holographic plate has several advantages over the optical storage (holographic optical storage) material previously reported. First, This RSPP is fit to record both transmission holograms and reflection holograms. Second, the holograms recorded in RSPP plate can be processed both in dry and in wet processes due to its strong real-time effect. The performance parameters of the ESPP are following: (a). The photosensitivity is about 2 at 630 nm; (b). the resolution of the material is more than 4000pp/mm; (c). the saturation refractive index modulation is 0.0034 and 0.0141 for real time and wet processing respectively. In the study of the exposure in RSPP holographic plate, some other phenomena concerning real time effect in RSPP, such as, light-amplification and modulation of single light beam effect, are found. The mechanism of these phenomena is discussed.