We present the results of an experimental study of waveguide tapers realized with segmented waveguides in LiNbO_3 substrates using the Soft Proton Exchange (SPE) technique. Measurements show that the tapers can be favorably introduced between the nonlinear or electro-optic part of the components, which requires strong mode confinement to increase efficiency, and the coupling section with a standard optical fiber, which requires low mode confinement, in order to have low coupling losses. These tapers allow almost lossless mode shape transformation with a reduction of the coupling losses up to 0.7 dB, thus proving the practical interest of the approach. As an example, the use of such tapers in a real integrated optical circuit is shown.
Segmented waveguide tapers for low insertion loss, high performance SPE:LiNbO_3 integrated circuits / Davide Castaldini; Paolo Bassi; Guillaume Bertocchi; Sorin Tascu; Pierre Aschieri; Marc De Micheli; Sebastien Tanzilli; Pascal Baldi. - STAMPA. - (2007), pp. 315-318. (Intervento presentato al convegno European Conference on Integrated Optics 2007, ECIO 2007 tenutosi a Copenhagen (DK) nel April 2007, 25-27).
Segmented waveguide tapers for low insertion loss, high performance SPE:LiNbO_3 integrated circuits
CASTALDINI, DAVIDE;BASSI, PAOLO;
2007
Abstract
We present the results of an experimental study of waveguide tapers realized with segmented waveguides in LiNbO_3 substrates using the Soft Proton Exchange (SPE) technique. Measurements show that the tapers can be favorably introduced between the nonlinear or electro-optic part of the components, which requires strong mode confinement to increase efficiency, and the coupling section with a standard optical fiber, which requires low mode confinement, in order to have low coupling losses. These tapers allow almost lossless mode shape transformation with a reduction of the coupling losses up to 0.7 dB, thus proving the practical interest of the approach. As an example, the use of such tapers in a real integrated optical circuit is shown.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.