title: Low-loss LiNbO(3) tapered-ridge waveguides made by optical-grade dicing.
abstract: We report on low-loss vertical tapers for efficient coupling between confined LiNbO3optical ridge waveguides and Single Mode Fibers. 3D-Pseudo-Spectral-Time-Domain calculations and Optical-Coherence-Tomography-based methods are advantageously used for the numerical and experimental study of the tapers. The tapered-section is done simultaneously with the ridge waveguide by means of a circular precision dicing saw, so that the fabrication procedure is achieved in only two steps. The total insertion losses through a 1.6 cm long ridge waveguide are measured to be improved by 3 dB in presence of the taper. These tapered-ridge waveguides open the way to the low-cost production of low-loss phase modulators or resonators.
authors.forename: Nadège
authors.initials: N
authors.lastname: Courjal
authors.forename: Fabrice
authors.initials: F
authors.lastname: Devaux
authors.forename: Arnaud
authors.initials: A
authors.lastname: Gerthoffer
authors.forename: Clément
authors.initials: C
authors.lastname: Guyot
authors.forename: Fabien
authors.initials: F
authors.lastname: Henrot
authors.forename: Abdoulaye
authors.initials: A
authors.lastname: Ndao
authors.forename: Maria-Pilar
authors.initials: MP
authors.lastname: Bernal