2D Transition metal dichalcogenides (TMDCs) are a class of 2D compound semiconductors with general formula of the kind MX2, where M is the transition metal species and X represents the chalcogen atom. For such materials the interaction occurs through van der Waals forces (vdW) leading to the possibility of stacking different compounds even with large lattice mismatch. Intensive studies have been performed on this novel materials in order to examine all their properties leading to a wide interest in today electronic and optoelectronic research fields. Nonetheless, 2D TMDCs can play an important role for optical applications thanks to their remarkable optoelectronic properties among which exciton based devices for photonic circuits emerge.