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Optical control of graphene-based photonic devices and systems has been underextensive explorations, nevertheless, the requirement of high power pump laserdue to incoherent modulation makes those schemes low efficient. Here, wedemonstrate coherent manipulation of the operating states of partiallymode-locked fiber laser based on coherent population oscillation in reducedgraphene oxide for the first time. We couple a much weaker continuous wavelaser into the resonator operating with parametric instability state, andobserve significant depression/enhancement of the sidebands when the coherentpopulation oscillation conditions are satisfied. Besides, significantdepression of partially mode-locked fiber laser is achieved. The experimentalresults reveal that the coherent population oscillation in reduced grapheneoxide is highly effective in manipulating mode-locked fiber laser system, andthe induced phase variation is highly asymmetrical. The discovery of coherentpopulation oscillation in reduced graphene oxide facilitates coherent opticalmodulation of reduced graphene oxide-based photonic devices and systems with amuch weaker controlling laser.

Coherent optical modulation of partially mode-locked fiber laser based on coherent population oscillation in reduced oxide graphene