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1 March 2006 Compact add-and-drop and wavelength filter based on microdisk on SOI substrate
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Recently, integrated optic applications on SOI substrate like add-and-drop structures or wavelength filters based on microdisk resonators have been investigated by many research groups. Microdisks exhibiting high quality-factor thanks to the high refractive index contrast between silica and silicon materials have been already reported. However efficient components usually show few micrometers diameter which is huge compared to photonic crystals ones. In this paper, realization and characterization of efficient and compact components are reported. The dropped-wavelength function, composed of a 1.5 μm radius disk and 0.3 μm x 0.3 μm square section waveguides is demonstrated. 22 dB extinction ratio is measured from spectral measurement while keeping a quality factor of 1000. In this structure, the distance between the microdisk and the waveguide is discussed from experimental point of view. Indeed, the efficiency of the add-and-drop strongly depends on this parameter. Moreover, a wavelength filter based on a 4 μm radius microdisk is also shown. Quality-factors of 92,900 ± 5500 were measured showing that these filters are more efficient than equivalent microring filters. A 10 dB extinction ratio of the wavelength rejected signal is reported. For some resonance wavelengths, spectral response degeneracy of the filter appears. An explanation of this effect is given in this paper.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alain Morand, Kien Phan-Huy, Bruno Martin, Fanny Bredillot, David Amans, Pierre Benech, Jérémy Verbert, Emmanuel Hadji, and Jean-Marc Fedeli "Compact add-and-drop and wavelength filter based on microdisk on SOI substrate", Proc. SPIE 6125, Silicon Photonics, 61250R (1 March 2006);

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