In this paper, it will be described the procedure that led us to create a multimode interferometer using two twisted silica single mode fibers (SMFs), inspired by the technologies developed by V. Kopp, et.al. [1]. A fiber Bragg grating (FBG) was written at this spirally twisted structure. In Fig. 1 it is shown a microscope image of one period of the twisted SMFs. After the fiber post processing and FBG inscription we observed the transmission optical spectrum and verified the signature of both multimode interferometer and FBG. This innovative structure is simple to fabricate and allow us to simultaneously characterize two parameters, namely torsion and strain through amplitude and wavelength, as developed on [2].