Tunable Time Delay in a Double-Ring Resonant System

Qiliang Li, Xin Chen, Junfeng Song +3 more

Qianfan Xu, Jagat Shakya, Michal F. Lipson

Direct time-domain measurement of tunable optical delay in a silicon resonating structure is presented. The structure is composed by a double-ring resonator, whose spectrum has a narrow transparency peak with low group velocity analogous to that in electromagnetically induced transparency. Effective group indices from 90 to 290 are obtained by tuning the resonator thermally. The measurements agree well with the theoretical analysis.

Yundong Zhang, Huaiyin Su, Yongfeng Wu +3 more

We theoretically demonstrate the transmittion spectra and dispersion characteristics based on the electromagnetically induced transparency like effect in the nested fiber double-ring resonator with the transfer matrix theory; the system which are connected by three directional couplers consists of two inner rings, one outer ring and one straight waveguide. The simulation results show that the tunable group delay can be realized by changing the coupling coefficients. In the NDRR coupled Mach-Zehnder interferometer system, we obtained fast light and slow light simultaneously. By adjusting appropriate parameters, we can archive flat band group delay curve that has a profound application in optical interferometer, optical buffer, optical filter, optical modulator, dynamic or static optical sensing field.

N. A. Ivanov

Richard M. Friedberg, Sven R. Hartmann, Jamal T. Manassah

Francesco Morichetti, Andrea Ivano Melloni, Cristina Canavesi +3 more

Tunable delay lines exploiting slow-light in directly-coupled ring-resonators are presented. Time delay can be tuned from zero to maximum. Experimental results showing delays of 300ps and slowing factor of 7.5 over 3GHz bandwidth are reported.