Comb spectra and coherent optical pulse propagation in a size-imbalanced coupled ring resonator

Transmission spectra and coherent optical pulse propagation though a size-imbalanced coupled ring resonator are investigated, where the size of the first ring is extremely large and has a narrow free-spectral-range with an extremely high Q-value, and the second ring is small with a moderate Q-value. The system shows characteristic comb spectra due to interference effects between the two resonators. When an arbitrary-shaped coherent pulse propagates through this system, a series of oscillating output pulses appears. It is shown that this pulse train develops into coherent 0π optical pulses.