Abstract
We have experimentally observed various bound states of parabolic pulses in a passively mode-locked Erbium-doped fiber ring laser. Beyond the mode-locking threshold, stable single parabolic pulse with the duration of 3.29 ps has been obtained and compressed outside the cavity to 253 fs assuming a sech2 profile. By increasing the pump power and rotating the polarization controllers, stable bound states of two parabolic pulses with a fixed separation of 6.5 ps has been obtained. Further increasing the pump power and carefully adjusting the intracavity PCs, multiple bound pulses have also been observed in the same cavity with the same pulse separation.
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