Possessing a variety of remarkable optical, electronic, and mechanical properties, graphene has emerged as an attractive material\nfor a myriad of optoelectronic applications. The wonderful optical properties of graphene afford multiple functions of graphene\nbased polarizers, modulators, transistors, and photodetectors. So far, the main focus has been on graphene based photonics and\noptoelectronics devices. Due to the linear band structure allowing interband optical transitions at all photon energies, graphene\nhas remarkably large third-order optical susceptibility x(3), which is only weakly dependent on the wavelength in the nearinfrared\nfrequency range.The graphene-assisted four-wave mixing (FWM)based wavelength conversions have been experimentally\ndemonstrated. So, we believe that the potential applications of graphene also lie in nonlinear optical signal processing, where the\ncombination of its unique large x(3) nonlinearities and dispersionless over the wavelength can be fully exploited. In this review\narticle,we give a brief overviewof our recent progress in graphene-assisted nonlinear optical device and their applications, including\ndegenerate FWM based wavelength conversion of quadrature phase-shift keying (QPSK) signal, phase conjugated wavelength\nconversion by degenerate FWM and transparent wavelength conversion by nondegenerate FWM, two-input and three-input highbase\noptical computing, and high-speed gate-tunable terahertz coherent perfect absorption (CPA) using a split-ring graphene
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