Abstract
We report on the observation of diverse structural bound-state patterns in a fiber laser mode-locked by nonlinear polarization rotation. By boosting the pump power, bound states with fixed soliton separation can be observed, where the soliton number inside the bound states increases from two solitons to 14 solitons. Apart from the aforementioned bound states with regular triangular autocorrelation envelopes, bound states with a compound soliton structure are also obtained, typically including the (2 + 2)-type, (2 + 2 + 2)-type, (2 + 1)-type, and (3 + 1)-type bound states. Additionally, numerical simulations are implemented to confirm the fine structure of the bound states.
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