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Dual-comb lasers from which asynchronous ultrashort pulses can besimultaneously generated have recently become an interesting research subject.They could be an intriguing alternative to the current dual-laseroptical-frequency-comb source with highly sophisticated electronic controlsystems. If generated through a common light path traveled by all pulses, thecommon-mode noises between the spectral lines of different pulse trains couldbe significantly reduced. Therefore, coherent dual-comb generation from acompletely common-path, unidirectional lasing cavity would be an interestingterritory to explore. In this paper, we demonstrate such a dual-comb lasingscheme based on a nanomaterial saturable absorber with additional pulsenarrowing and broadening mechanisms concurrently introduced into a mode-lockedfiber laser. The interactions between multiple soliton formation mechanismsresult in unusual bifurcation into two-pulse states with quite differentcharacteristics. Simultaneous oscillation of pulses with four-fold differencein pulsewidths and tens of Hz repetition rate difference is observed. Thecoherence between these spectral-overlapped, picosecond and femtosecond pulsesis further verified by the corresponding asynchronous cross-sampling anddual-comb spectroscopy measurements.

Unidirectional, dual-comb lasing under multiple pulse formation mechanisms in a passively mode-locked fiber ring laser