The guided modes of a two-dimensional photonic crystal straight waveguide
and a waveguide bend are studied in order to find the high transmission mechanism
for the waveguide bend. We find that high transmission occurs when the mode
patterns and wave numbers match, while the single-mode condition in the waveguide
bend is not necessarily required. According to the mechanism, a simply modified
bend structure with broad high transmission band is proposed. The bandwidth
is significantly increased from 19 to 116 nm with transmission above 90%,
and covers the entire C band of optical communication.
© 2008 IEEE
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