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Proceedings Paper

Simulation and fabrication of silicon oxynitride array waveguide grating for optical communication
Author(s): Wen-Jen Liu; Yin-Chieh Lai; Min-Hang Weng; Chih-Min Chen; Peng-Hsiao Lee
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Paper Abstract

Silicon oxynitride (SiOxNy) grown by plasma enhanced chemical vapor deposition (PECVD) is well-suited for the realized application of high contrast waveguides for the range of the refractive index can be largely tuned (1.45-2.0). SiOxNy AWG device with 3% refractive index difference (Δ) and the transmission spectrum of AWG's device indicated the insertion loss, crosstalk and side-lobe were lower than -3 dB, -15 dB and -40 dB, respectively, by 3D beam propagation method were investigated in this study. The chip size of the whole device is smaller than 4 cm x 1.5 cm, and the highest coupling loss of the rib waveguide for single mode fiber was about -1.6 dB. Based on the simulation results, the device can be really fabricated by thin-film deposition, photo-lithography and dry-etching processes. Microstructural evolution analysis revealed over-supplied silicon atoms would form silicon nano-crystallized structure in the amorphous optical films for lower N2O/(N2+NH3) ratio, and resulted in higher refractive index and extinction coefficient. From the scanning electron microscopy (SEM) features of rib-type silicon oxynitride waveguide, we found the profile, and the roughness of side- and top-walls of waveguide reached to the manufacturing criteria of AWG device. We had successfully fabricated an AWG device with 8 channels and 1.6nm channel spacing, and the coupling loss and propagation loss were about -2.24 dB and -0.15 dB/cm, respectively. While, the AWG device performances need further improvements by modified design, uniform thin film deposition, and accurate dry-etching processes.

Paper Details

Date Published: 4 April 2005
PDF: 12 pages
Proc. SPIE 5723, Optical Components and Materials II, (4 April 2005); doi: 10.1117/12.590039
Show Author Affiliations
Wen-Jen Liu, I-Shou Univ. (Taiwan)
Yin-Chieh Lai, National Chiao Tung Univ. (Taiwan)
Min-Hang Weng, National Nano Devices Labs. (Taiwan)
Chih-Min Chen, National Chiao Tung Univ. (Taiwan)
Peng-Hsiao Lee, I-Shou Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5723:
Optical Components and Materials II
Shibin Jiang; Michel J.F. Digonnet, Editor(s)

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