Open AccessLow-loss LiNbO_3 tapered-ridge waveguides made by optical-grade dicing
Author(s) -
Nadège Courjal,
F. Devaux,
Arnaud Gerthoffer,
Clément Guyot,
Fabien Henrot,
Abdoulaye Ndao,
Maria–Pilar Bernal
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.013983
Subject(s) - wafer dicing , optics , materials science , resonator , lithium niobate , waveguide , fabrication , ridge , optical coherence tomography , wavefront , insertion loss , optoelectronics , physics , wafer , geology , medicine , paleontology , alternative medicine , pathology
We report on low-loss vertical tapers for efficient coupling between confined LiNbO 3 optical 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.