6 research outputs found
Toward an optimal foundation architecture for optoelectronic computing .1. Regularly interconnected device planes
Cataloged from PDF version of article.By systematically examining the tree of possibilities for optoelectronic computing architectures and
offering arguments that allow one to prune suboptimal branches of this tree, I come to the conclusion that
electronic circuit planes interconnected optically according to regular connection patterns represent an
alternative that is reasonably close to the best possible, as defined by physical limitations. Thus I
propose that this foundation architecture should provide a basis for future research and development in
this area. © 1997 Optical Society of Americ
Optoelectronic devices and packaging for information photonics
This thesis studies optoelectronic devices and the integration of these components onto
optoelectronic multi chip modules (OE-MCMs) using a combination of packaging
techniques. For this project, (1×12) array photodetectors were developed using PIN
diodes with a GaAs/AlGaAs strained layer structure. The devices had a pitch of 250μm,
operated at a wavelength of 850nm. Optical characterisation experiments of two types
of detector arrays (shoe and ring) were successfully performed. Overall, the shoe
devices achieved more consistent results in comparison with ring diodes, i.e. lower dark
current and series resistance values. A decision was made to choose the shoe design for
implementation into the high speed systems demonstrator. The (1x12) VCSEL array
devices were the optical sources used in my research. This was an identical array at
250μm pitch configuration used in order to match the photodetector array. These
devices had a wavelength of 850nm. Optoelectronic testing of the VCSEL was
successfully conducted, which provided good beam profile analysis and I-V-P
measurements of the VCSEL array. This was then implemented into a simple
demonstrator system, where eye diagrams examined the systems performance and
characteristics of the full system and showed positive results.
An explanation was given of the following optoelectronic bonding techniques: Wire
bonding and flip chip bonding with its associated technologies, i.e. Solder, gold stud
bump and ACF. Also, technologies, such as ultrasonic flip chip bonding and gold
micro-post technology were looked into and discussed. Experimental work
implementing these methods on packaging the optoelectronic devices was successfully
conducted and described in detail. Packaging of the optoelectronic devices onto the OEMCM
was successfully performed. Electrical tests were successfully carried out on the
flip chip bonded VCSEL and Photodetector arrays. These results verified that the
devices attached on the MCM achieved good electrical performance and reliable
bonding. Finally, preliminary testing was conducted on the fully assembled OE-MCMs.
The aim was to initially power up the mixed signal chip (VCSEL driver), and then
observe the VCSEL output
Design and analysis of a 3-dimensional cluster multicomputer architecture using optical interconnection for petaFLOP computing
In this dissertation, the design and analyses of an extremely scalable distributed
multicomputer architecture, using optical interconnects, that has the potential to
deliver in the order of petaFLOP performance is presented in detail. The design
takes advantage of optical technologies, harnessing the features inherent in optics,
to produce a 3D stack that implements efficiently a large, fully connected system of
nodes forming a true 3D architecture. To adopt optics in large-scale multiprocessor
cluster systems, efficient routing and scheduling techniques are needed. To this
end, novel self-routing strategies for all-optical packet switched networks and on-line
scheduling methods that can result in collision free communication and achieve real
time operation in high-speed multiprocessor systems are proposed. The system is designed
to allow failed/faulty nodes to stay in place without appreciable performance
degradation. The approach is to develop a dynamic communication environment that
will be able to effectively adapt and evolve with a high density of missing units or
nodes. A joint CPU/bandwidth controller that maximizes the resource allocation in
this dynamic computing environment is introduced with an objective to optimize the
distributed cluster architecture, preventing performance/system degradation in the
presence of failed/faulty nodes. A thorough analysis, feasibility study and description of the characteristics of a 3-Dimensional multicomputer system capable of achieving
100 teraFLOP performance is discussed in detail. Included in this dissertation is
throughput analysis of the routing schemes, using methods from discrete-time queuing
systems and computer simulation results for the different proposed algorithms. A
prototype of the 3D architecture proposed is built and a test bed developed to obtain
experimental results to further prove the feasibility of the design, validate initial assumptions,
algorithms, simulations and the optimized distributed resource allocation
scheme. Finally, as a prelude to further research, an efficient data routing strategy
for highly scalable distributed mobile multiprocessor networks is introduced
Design of diffractive optical elements through low-dimensional optimization
The simulation of diffractive optical structures allows for the efficient testing of a large number of structures without having to actually fabricate these devices. Various forms of analysis of these structures have been done through computer programs in the past. However, programs that can actually design a structure to perform a given task are
very limited in scope. Optimization of a structure can be a task that is very processor time intensive, particularly if the optimization space has many dimensions. This thesis describes the creation of a computer program that is able to find an optimal structure while maintaining a low-dimensional search space, thus greatly reducing the processor time required to find the solution. The program can design the optimal structure for a wide variety of planar optical devices that conform to the weakly-guiding approximation with an efficient code that incorporates the low-dimensional search space concept. This
work is the first use of an electromagnetic field solver inside of an optimization loop for the design of an optimized diffractive-optic structure.Ph.D
Reports to the President
A compilation of annual reports for the 1981-1982 academic year, including a report from the President of the Massachusetts Institute of Technology, as well as reports from the academic and administrative units of the Institute. The reports outline the year's goals, accomplishments, honors and awards, and future plans