title: High performance mode adapters based on segmented SPE:LiNbO3 waveguides.
abstract: We propose a new mode adapter which allows more efficient launching of the optical power selectively in the fundamental mode of a multimode waveguide. Theoretical and experimental results confirm that such a mode adapter increases the performances in terms of coupling efficiency, coupling tolerances and transmitted power with respect to previously proposed solutions. Proof of principle of device operation is obtained with a simple Coupled Mode Theory model. Experimental results are obtained at a wavelength of 840 nm in Lithium Niobate Soft Proton Exchanged waveguides and agree very well with theoretical predictions.
authors.affiliation: Dipartimento di Elettronica Informatica e Sistemistica, University of Bologna, Viale del Risorgimento 2, I 40136 Bologna, Italy.
authors.forename: Davide
authors.initials: D
authors.lastname: Castaldini
authors.forename: Paolo
authors.initials: P
authors.lastname: Bassi
authors.forename: Pierre
authors.initials: P
authors.lastname: Aschieri
authors.forename: Sorin
authors.initials: S
authors.lastname: Tascu
authors.forename: Marc
authors.initials: M
authors.lastname: De Micheli
authors.forename: Pascal A
authors.initials: PA
authors.lastname: Baldi
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D009556:Niobium / Q000737:chemistry*; D055096:Optical Devices; D010087:Oxides / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity
chemical_list: D010087:Oxides; D009556:Niobium; C091692:lithium niobate