Coherent optical modulation of graphene based on coherent population oscillation

Abstract

Optical control of graphene-based photonic devices and systems has been under extensive explorations, nevertheless, the requirement of high power pump laser due to incoherent modulation makes those schemes low efficient. Here, we demonstrate coherent manipulation of the operating states of partially mode-locked fiber laser based on coherent population oscillation in reduced graphene oxide for the first time. We couple a much weaker continuous wave laser into the resonator operating with parametric instability state, and observe significant depression/enhancement of the sidebands when the coherent population oscillation conditions are satisfied. Besides, significant depression of partially mode-locked fiber laser is achieved. The experimental results reveal that the coherent population oscillation in reduced graphene oxide is highly effective in manipulating mode-locked fiber laser system, and the induced phase variation is highly asymmetrical. The discovery of coherent population oscillation in reduced graphene oxide facilitates coherent optical modulation of reduced graphene oxide-based photonic devices and systems with a much weaker controlling laser.

Graphene-Assisted Polymer Waveguide Optically Controlled Switch Using First-Order Mode

“…As a two-dimensional (2D) material, graphene has many obvious electrical, optical, physical, and chemical properties. It has been extensively investigated in the field of opto-electronics, such as in optical modulators [ 9 , 10 ], photodetectors [ 11 ], polarizers [ 12 ], and saturable absorbers [ 13 ]. Graphene is also a promising material in the all-optical devices due to its photo-thermal properties [ 14 , 15 ].…”