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Proceedings Paper

High-silica low-loss three-waveguide couplers on Si by flame hydrolysis deposition
Author(s): Giovanni Barbarossa; Peter J. R. Laybourn
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Paper Abstract

The authors report the fabrication of high-silica, low-loss three-waveguide couplers (3WC) on Si by a combination of flame hydrolysis deposition (FHD), photolithographic patterning, and reactive ion etching. The device has been designed using the first-order perturbation theory, in order to achieve single-mode operation and to predict the beating length. Simulation of the device has been performed using the beam propagation method. SiO2-P2O5 glass has been employed as core material. P2O5 has been used to increase the refractive index of silica, as well as to decrease its sintering point. The sintering process has been optimized in order to achieve completely sintered, bubble free, low-loss films, preventing the evaporation of the P2O5 as well as the warping of the substrate. The devices have been characterized in terms of insertion loss, power splitting ratio and spectral response. 3WCs with multiple number of beating lengths have also been considered in order to assess the modulation of their spectral response with increasing interaction length.

Paper Details

Date Published: 1 August 1991
PDF: 7 pages
Proc. SPIE 1513, Glasses for Optoelectronics II, (1 August 1991); doi: 10.1117/12.46006
Show Author Affiliations
Giovanni Barbarossa, Univ. of Glasgow (United Kingdom)
Peter J. R. Laybourn, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 1513:
Glasses for Optoelectronics II
Giancarlo C. Righini, Editor(s)

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