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Proceedings Paper

Spot size mode converter for efficient coupling to SiN waveguides
Author(s): My T. Doan; Chi Fo Tsang; Badam Ramana Murthy; Babu Narayanan; Chang Kuo Chang; Sohan Singh Mehta; Kuan Pei Yap; Desmond R. Lim
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Paper Abstract

To miniaturize optical passive components or to have optical interconnects replace the current copper/low k interconnects for clock distribution, super high index contrast optics are needed because they allow optical waveguides with small bending radius, ie. < 50um. Silicon nitride core on oxide cladding has loss of <0.1dB/180° for 20um bending radius. However, coupling loss from the fiber to SiN waveguides, with 0.7umx0.7um cross section for single mode, is very large, > 20dB. To reduce the coupling loss, our approach is to have a double-core architecture, where fiber is first coupled to fiber matched waveguide, and then coupling from fiber match waveguide to SiN waveguide through a spot size mode converter. We have found the mode converter loss is reduced by 8dB by reducing the tip of the taper from 0.35um to 0.15um. In this paper, we are reported results of tips with less than 0.1um. We also describe the fabrication technology that enables us to make such fine tip with smooth surfaces.

Paper Details

Date Published: 20 December 2004
PDF: 8 pages
Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004); doi: 10.1117/12.567578
Show Author Affiliations
My T. Doan, Institute of Microelectronics (Singapore)
Chi Fo Tsang, Institute of Microelectronics (Singapore)
Badam Ramana Murthy, Institute of Microelectronics (Singapore)
Babu Narayanan, Institute of Microelectronics (Singapore)
Chang Kuo Chang, Institute of Microelectronics (Singapore)
Sohan Singh Mehta, Institute of Microelectronics (Singapore)
Kuan Pei Yap, Carleton Univ. (Canada)
Desmond R. Lim, Photonics Concepts (Singapore)

Published in SPIE Proceedings Vol. 5577:
Photonics North 2004: Optical Components and Devices
John C. Armitage; Simon Fafard; Roger A. Lessard; George A. Lampropoulos, Editor(s)

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