| Summary: | 碩士 === 國立交通大學 === 工學院半導體材料與製程設備學程 === 105 === Multi-section semiconductor laser is with multiple roles, i.e. laser source, periodic optical clock source, wavelength conversion application, and clock recovery. Being a periodic optical clock source, the output of one multi-section semiconductor laser is periodic optical signal. But, will such semiconductor laser periodic optical output be stable periodic optical signal?
This report focuses on two sections distributed feedback semiconductor laser, and the research point is the internal optical field dynamics of two sections distributed feedback semiconductor laser and dynamics of output periodic optical signal. Limited to the frame of two sections distributed feedback semiconductor laser, we study the effect of output waveform dynamics because of laser structure parameter.
The study take semiconductor laser cavity length, two facet phase changing, and linewidth enhancement factor as structure parameters. The dispersive-Q-switching and mode beating theory are the basis of finite difference analysis algorithm; and we first compare the internal optical field with the result of the prior art by Carroll (1998) to check the acceptance of initial simulation result.
Then, based on the above three structure parameters, we tune these parameters to simulation 12 situation to verify that the above laser structure parameters affect the stability in waveform of periodic optical output. In addition, we also verify that even the structure parameters are unchanged, in other words, no cross-section dynamic, it is still possible to generate unstable periodic optical output, hence, we introduce signal time series concept, i.e. using auto-regression model to process practical analysis. Our research hypothesis: the periodic optical output signal of semiconductor lasers is with time series auto-regression. The practical result verify that the statistical significant in auto-regression model, in other words, longitudinal section is like as time series.
We propose one combined analysis of longitudinal section and cross-section, which include two-step analysis architecture as the decision weather semiconductor laser periodic optical output be stable periodic optical signal.
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