
274 Communication Architectures for SoC
FIGURE 7.22
Quasi-TM transmission spectrum of a single-couple ring resonator [2].
without coupling into the ring. In Figure 7.22, the transmission of the adja-
cent waveguide to a micro-ring resonator reported in [2] is shown. As can be
seen, when the incident wavelength fulfills Equation (7.6), light transmission
through the adjacent waveguide drops strongly.
Modifying the resonant condition of the micro-ring, the signal at the end
of the adjacent waveguide can be intensity-modulated. Seeing Equation (7.6),
it is easy to conclude that by tuning the effective refractive index of the ring
waveguide (n
eff
), the resona ...