This article is cited in 4 papers

Waveguides

Optical properties of wide single-mode strip and grating loaded channel waveguides

A. V. Tsarev

Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk

Abstract: New wide single-mode strip and grating loaded (SGL) channel waveguides made of silicon nitride on the oxide buffer layer of a planar silicon-on-insulator waveguide are studied. The central 10-lm-wide strip produces a multi-mode channel waveguide and diffraction gratings with a period 0.6 lm built on the structure edges produce mode-dependent additional losses due to radiation to the surrounding medium. The optical properties of these waveguides are discussed using the results of a three-dimensional numerical simulation by the FDTD and BPM methods. It is shown that a wide SGL waveguide is quasi-single-mode one because ithas a small propagation loss (~0.3 dB cm^-1) for the fundamental mode and a high (up to -20 dB cm^-1) loss forthe higher order modes. The new SGL waveguides are CMOS compatible and can become basic for fabricating new photonic elements, including tunable optical filters and multi-plexers based on the multireflector technology.

PACS: 42.82.Et, 42.82.Bq, 42.79.Dj

Received: 29.07.2009
Revised: 08.10.2009

 English version: Quantum Electronics, 2009, 39:12, 1169–1174

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