Abstract
Two methods for extracting linewidth estimates from evenly sampled partially coherent signals, where white frequency fluctuations are the major source of noise, are discussed. The first method utilizes the Allan deviation, requiring multiple frequency estimates for each linewidth estimate. The second method utilizes the second-order autoregressive model to provide a linewidth estimate with each frequency estimate. A characterization shows that the latter technique is reliable for short data sets (</=1 s). The application of these techniques to large, quantum-noise-limited ring laser gyroscopes is demonstrated. The results of the analysis compare favorably with a theoretical analysis.
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