Abstract
Waveguide coupling to closed loop coupled-resonator optical waveguides
is explored. By coupling a CROW chain back on itself, a reduction in individual
resonant linewidth is achieved making these slow light modes more conducive
to periodic filters toward novel frequency-comb integration. Through numerical
simulation by finite-difference time-domain methods, the importance of waveguide
symmetry conditions for coupling is illustrated. The impact of unit cavity
mode symmetry strongly impacts the necessary coupling geometry to both cavities
and waveguides. Design insight into different waveguide coupling schemes is
provided while aiming to achieve transmission of the resonant structure exhibited
by the isolated resonator.
© 2013 IEEE
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