Abstract
We investigate theoretically how the intermodal dispersion and the fiber length influence the formation of ultrashort pulses in a dual-core fiber laser. Our simulation using the Ginzburg–Landau equation found that stable self-starting of mode-locking can be achieved with a fiber length deviating from integer multiples of the linear coupling length. Furthermore, the intermodal dispersion will not lead to pulse splitting, in contrast, it will induce asymmetry in the pulse shape and increase the modulation instability. Consequently, a filter is found necessary to stabilize the mode-locking operation when the fiber length is longer than the linear coupling length.
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