Abstract
The group velocity v<sub><i>g</i></sub> of light in two-port
ring-resonator (TPRR) circuits with loss is theoretically studied. We point out four possible operation regimes,
i.e., “slow” light with positive v<sub><i>g</i></sub>,
“slow” light with negative v<sub><i>g</i></sub>,
“fast” light with negative v<sub><i>g</i></sub>, and
“fast” light with positive v<sub><i>g</i></sub>, where
“slow” means │v<sub><i>g</i></sub>│< <i>c</i> and
“fast” means │v<sub><i>g</i></sub>│> <i>c</i>, with
<i>c</i> denoting the velocity of light in vacuum. The temporal
behavior of pulses passing through the TPRR for the four operation regimes and the potential of “slow”
light TPRR either with positive or negative v<sub><i>g</i></sub> for sensing
applications are also discussed.
© 2007 IEEE
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