Abstract
We propose to generate controllable time delay using slow/fast light in fiber ring resonators with gain manipulation. The dispersion and group delay of active fiber ring resonator can be controlled by manipulating its gain level below the lasing threshold. Controllability of the negative group delay in the undercoupled regime and the positive group delay in the overcoupled regime is theoretically demonstrated. Besides, large group delay can be obtained accompanied by signal gain in active ring resonators. In addition, we describe wide bandwidth and large group delay in 4-stage cascaded ring resonators.
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