Theses and Dissertations at Montana State University (MSU)
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Item Applying fiberoptic data links to instrumentation(Montana State University - Bozeman, College of Engineering, 1980) Beer, Michael StevenItem Reduction of EDFA optical power transients using power shaping(Montana State University - Bozeman, College of Engineering, 2008) Jackson, James Trent; Chairperson, Graduate Committee: Richard WolffMany erbium doped fiber amplifier (EDFA) based multi-wavelength optical networks employ techniques such as burst-switching or packet switching where the time interval between traffic blocks can be long enough to induce EDFA optical power transients. The optical power transients are created by abrupt changes in the average input power to the EDFAs and can adversely affect the performance of the network. To mitigate the effects of EDFA optical power transients on optical networks, a method called power shaping where heads and tails are joined to the beginning and end of a traffic block is investigated. A head (tail) gradually increases (decreases) the channel power by employing a bit sequence in which the probability of a "1" ("0") increases from 0 to 0.5. Theoretical and experimental results both show that EDFA optical power transients can be significantly reduced with adequate shaping periods. Experiments also show the bit error rate of the system is reduced for increased shaping periods. Power shaping is an economical means of suppressing EDFA optical power transients compared to other physical layer approaches that require the addition of specialized components and can be applied to EDFAs as well as other solid-state and Raman optical amplifiers.Item Wireless sensor interrogator design for passive, resonant frequency sensors using frequency modulation spectroscopy(Montana State University - Bozeman, College of Engineering, 2009) Peterson, Brian James; Chairperson, Graduate Committee: Todd KaiserThe lack of passive, wireless, chemical and biological sensor systems is a significant impediment to sensor system applications. While active sensors with a wireless communications link continue to decrease in power consumption, they still require a power source, such as a battery. This active power consumption limits the useful life of the sensor and its applications. A more attractive solution would be a passive, wireless, chemical and biological sensor integrated with a wireless interrogation platform to monitor the sensor. The focus of this thesis is the realization of a wireless sensor interrogator capable of monitoring multiple, passive, resonant-frequency sensors. It is demonstrated, using Frequency Modulation Spectroscopy techniques, that the resonant frequency of a passive sensor can be detected and tracked over time. Simulated results are presented that verify the functionality of the proposed wireless sensor interrogator. In addition, an experimental hardware setup and subsequent experimental results are presented that verify the simulation results. Considerations for the design of the wireless sensor interrogator and opportunities for future research are discussed.