Performance and Energy Evaluation of Parallelization Strategies for Network on Chip Communication Architectures: Case Study of Canny Edge Detector Application

The substantial amount of research pertaining to the usage of optical networks for communication between cores in a multicore processor underlines the need for effective communication schemes. This necessitates the exploration of the efficiency of an optical network with a suitable benchmark which compares the different features essential for having an effective communication between the cores. As far as communication in a network is considered, the parameters that are most crucial are the delays and energy consumption. This thesis focuses on an industrial-sized application from the image processing field, Canny Edge Detector, to compare the performance in terms of network parameters which are the contention delay, latency and the energy consumption with the different settings on the network on chip simulator. The Canny Edge Detector application is implemented with various software parallelization schemes for better performance as compared to the normal serialized application. Also, to analyze the effectiveness of multicore processors, a comparison among sequential and parallelized coding techniques is performed in this thesis. Software parallelization schemes applied to the algorithm executed on optical network architectures improve the latency and delay of the network up to 60% in the best case, while the total energy consumption values have a worst case overhead of around 50%. For almost all the configuration parameters, the parallelized schemes provide much better results for the outputs than the sequential implementation. The design parameters help determine the optimal amount of resources required for efficient execution of an image processing algorithm using a moderate to heavy workload on an NoC based on the minimal delay and energy consumption values

Optical gating with organic building blocks : A quantitative model for the fluorescence modulation of photochromic perylene bisimide dithienylcyclopentene triads

We investigated the capability of molecular triads, consisting of two strong fluorophores that were covalently linked to a photochromic molecule, for optical gating. Therefore we monitored the fluorescence intensity of the fluorophores as a function of the isomeric state of the photoswitch. From the analysis of our data we develop a kinetic model that allows us to predict quantitatively the degree of the fluorescence modulation as a function of the mutual intensities of the lasers that are used to induce the fluorescence and the switching of the photochromic unit. We find that the achievable contrast for the modulation of the fluorescence depends mainly on the intensity ratio of the two light beams and appears to be very robust against absolute changes of these intensities. The latter result provides valuable information for the development of all-optical circuits which would require to handle different signal strengths for the input and output levels