期刊
OPTICS EXPRESS
卷 22, 期 24, 页码 29954-29963出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.029954
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- Agency for Science Technology and Research (A*STAR) Joint Council Office (JCO), Singapore [1234e00018]
In this paper, we demonstrate an optical filter using cladding modulated anti-symmetric long-period grating in a two-mode silicon waveguide. The filter consists of a two-mode waveguide connected with an input and output single-mode waveguide through two linear tapers. The anti-symmetric grating is formed by placing two periodic arrays of silicon squares offset by half of a grating pitch along the two-mode waveguide. Light coupling occurs between two co-propagating modes at the coupling wavelength through the grating and results in a rejection band at the output. The grating pitch, coupling coefficient, transmission spectrum and 3-dB bandwidth of the grating are investigated with the coupled-mode theory. By using a cladding modulated grating, the grating coupling strength can be controlled over a wide range by the two-mode waveguide width or separation distance between the grating and waveguide. Band-rejection filters are experimentally demonstrated in 1-mu m, 0.8-mu m and 0.7-mu m wide two-mode silicon waveguides and rejection bands with different bandwidths and maximal attenuation contrasts larger than 15 dB (similar to 97% coupling efficiency) have been achieved. (C) 2014 Optical Society of America
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