Abstract
Periodic void formation has the function of a built-in clock made of silica melt, and its frequency is expected to shift with changes in pump power. Thus, the variation in the periodic void interval along the fiber length is precisely measured to determine the relationship with the pump power modulation. This analysis revealed the sub-millisecond order delayed response of the silica melt. Moreover, a large power jump suspends the clock and leave a void-free segment or a long void until the melt restores its state of thermal equilibrium.
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