Abstract
A 2-D blazed grating coupler with fully etched triangular holes to realize high
efficient and broadband coupling between silicon-on-insulator nanowaveguide and fiber is
proposed. By changing the lateral width of a triangular hole along propagating direction
in each single grating period gradually according to effective medium theory, a high
coupling efficiency of -2.78 dB and an extremely large 1 dB bandwidth of 180 nm are
achieved simultaneously. By optimizing the buried oxide thickness from 2 to 1.83
<i>μ</i>m, the coupling efficiency can be further improved to -2.18 dB and
1 dB bandwidth is enlarged to 290 nm.
© 2012 IEEE
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