The realization of a Fabry–Pérot (F-P) cavity based on a ${rm Ti}{:}{rm LiNbO}_{3}$ optical waveguide obtained by using a concept which consists of milling the Bragg gratings (BGs) in the cavity by the focused ion beam technique is shown in this letter. This F-P cavity is formed by two BGs which represent the two reflecting mirrors of the interferometer. The length of the cavity is defined by the distance between the two BGs. Thirty-one peaks and a free spectral range $({rm FSR})=1.75~{rm nm}$ have been experimentally obtained in the range of wavelengths $[1505hbox{--}1548]~{rm nm}$. The experimental results are in accordance with those of theory. The fabrication process, the experimental results, as well as improvements to increase finesse F and FSR are discussed.

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