Sökning: "coherent detection"
Visar resultat 1 - 5 av 83 avhandlingar innehållade orden coherent detection.
1. Fiber-Optic Systems with Coherent Detection and Four-Dimensional Modulation
Sammanfattning : To increase the data rates of fiber-optic communication systems, modulation formats withhigher spectral efficiency and/or higher power efficiency than binary formats are of greatinterest. These formats require coherent detection and this thesis has been dedicated toinvestigating both novel modulation formats and two different types of coherent systems. LÄS MER
2. Coherent CO2 laser radar in active imaging systems
Sammanfattning : .... LÄS MER
3. Multidimensional Modulation Formats for Coherent Optical Communication Systems
Sammanfattning : Coherent optical receivers have enabled the use of multilevel modulation formats with high spectral efficiencies and long transmission reaches. Traditionally, modulation formats utilizing the two dimensions spanned by the amplitude and the phase of the signal have been dominating. LÄS MER
4. Multi-level modulation formats for high-speed optical transmission systems
Sammanfattning : Over the past several years, the use of multi-level modulation formats has enabledsignificant improvements in the field of optical fiber communication, particularlyin terms of per-channel bit-rate (i.e., line-rate) and spectral efficiency (SE), byencoding multiple bits per symbol. LÄS MER
5. Aspects of Power Consumption in Coherent Fiber-Optical Communication Systems
Sammanfattning : The power consumption of coherent fiber-optical communication systems is becoming increasingly important, for both environmental and economical reasons. The data traffic on the Internet is increasing at a faster pace than that at which optical network equipment is becoming more energy efficient, which means that the overall power consumption of the Internet is increasing. LÄS MER