Beside taking arrhythmia medicines, what are other option for atrial fibrillation? Does a pace maker or defibrillator cure a fib?

Ablation. Catheter ablation (pulmonary vein isolation) can be curative. Although not curative, an av node ablation in combination with a pacemaker or defibrillator can usually eliminate the symptoms of atrial fibrillation. If you have obstructive sleep apnea using CPAP can greatly improve atrial fibrillation.
Ablation. After assessing the underlying cause of the fibrillation and measuring the size of the two atrial heart chambers, using echocardiography, one can predict the likelihood that the fibrillation will respond to electrical ablation using an intracardiac catheter. Defibrillation of atrial fibrillation might not prevent a recurrence if the underlying cause still exists.