Abstract
As the number of compound cavity modes within the stopband of DFB sections decreases, the frequency of mode hopping decreases for the variation of λ, which represents the difference between the Bragg wavelengths of two DFB sections, so that the number of abrupt changes of pulsation frequencies decreases. In addition, the pulsation frequency varies continuously for the variation of the phase in a phase tuning section for a fixed λ. The number of compound cavity modes within the stopband decreases as the length of DFB sections increases and the length of a phase tuning section decreases. Thus stable self-pulsation operations for the variation of λ and the phase in a phase tuning section could be obtained by proper selection of the coupling strength and the length of each section.ction.
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