Abstract
Slow light in slotted photonic crystal waveguide is a promising approach
for practical applications. Two of the crucial concerns of this technology
are the limited bandwidth and the pulse broadening. It was demonstrated that
wideband slow light with large group index and low dispersion could be realized
by shifting the first and second rows of air holes adjacent to the slot. Keeping
the group index at 28, 41, and 105, respectively, the corresponding bandwidths
of flat and low dispersion band could reach 17, 6.8, and 1.7 nm around 1550
nm. To further enlarge the bandwidth and group index, the oblique structure
was introduced, and the bandwidths over 23.6, 6, and 1.8 nm were achieved
with the group index of 30, 45, and 110, respectively. Then the propagation
of slow light optical pulse was performed in time domain by the finite-difference
time-domain method and a resonant structure was designed for input and output
interfaces to improve the coupling efficiency.
© 2012 IEEE
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