Optické přijímače s dynamickou rozhodovací úrovní

Abstract

This thesis deals with the optical omnidirectional multiple segments receiver design and assembly. The omnidirectional receiving capability is ensured by several photodetectors placed on truncated pyramid walls. Instead of switching to the strongest signal photodetector, the signals are summed and processed as a whole. In other words, the parallel amplifier is formed. Because the noise parameters are influenced by a number of photodetectors, they are evaluated with respect to them. The noise parameters are measured indirectly by the data stream bit error rate investigation. Because of this, there are discussed not only optical receivers but also optical transmitters and other tools of data transfer. The phase encoding (PE) was chosen as the most suitable line code. The paper continues with the falling radiation angle and total photocurrent dependency investigation. As a result, the optimal angle is defined. It is also expected that optical receiver works properly over a wide range of signal levels. That is why variable gain amplifiers are listed, and the novel amplifier is described. Its small distortion and significant versatility are outstanding. The thesis ends with the parametric and photoparametric amplifier design.