Sharif Digital Repository

In this dissertation, the statistical analysis of ultrashort light pulse detectors, in presence of different noise sources, is presented. By investigating performance degradation of ultrashort light pulses detection based on linear conventional detectors, the necessity of all optical preprocessors prior to the low speed photodetectors is approved. By using these preprocessors, we achieve high discrimination between noise and ultrashort light pulses at the photodetector input, for simplicity in detection of light pulses by conventional low speed photodetectors. Among various types of preprocessors, in this dissertation, we focus on optical crystals with dominant imposed nonlinear second... 

In recent years, the biological evolution of molecular detection capabilities based on gene analysis has provided a reliable performance in the diagnosis of a disease before a symptom emerges. Human gene storage requires a large amount of computer memory (about 1.5 GB for each DNA) and the search for a specific pattern within it with electronic computers is time and power consuming. Optical computing uses light parallel processing capabilities to find the pattern in a digital field, which can be used to process large volumes of data in short time and low power consumption, while electronic computers process data in series with high power dissipation. According to the Optalysys report, the...