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Physical Review A

Effects of loss and gain on group-velocity control in microring resonators

Yongfeng Wu, Mei Kong, Xin Liu, Yi Jiang

Published Jul 8, 2013• 2 citations
Publisher

Abstract

When used to control the group velocity of light pulses, a microring resonator with loss often induces pulse splitting in addition to wearing down the pulse energy, whereas a gain microring resonator with identical dispersion can usually keep the pulse shape and make the pulse delay greater. Based on the symmetry between the transmission properties of microring resonators with gain and with loss and linear system theory, we illustrate the effects of gain and loss on pulse splitting and delay and reveal the mechanism by which gain improves the group-velocity control behaviors of the microring resonators.

DOI
10.1103/physreva.88.013811

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When used to control the group velocity of light pulses, a microring resonator with loss often induces pulse splitting in addition to wearing down the pulse energy, whereas a gain microring resonator with identical dispersion can usually keep the pulse shape and make the pulse delay greater. Based on the symmetry between the transmission properties of microring resonators with gain and with loss and linear system theory, we illustrate the effects of gain and loss on pulse splitting and delay and reveal the mechanism by which gain improves the group-velocity control behaviors of the microring resonators.
Using single-ring microresonators with loss to realize the light speed control encounters difficulties of heavy light loss and serious pulse distortion.Based on the symmetry between the transfer characteristics of resonators with loss and with gain,the transmission,group index,and group velocity dispersion of a single-ring microresonator are calculated and analyzed.The action mechanism of the loss and gain on the transfer characteristics of the micro-ring resonator is demonstrated.The light speed control behavior of the resonator with gain is calculated and compared with that of the resonator with loss.Calculation results indicate that the resonator with gain can produce the nonsplitted pulses with higher intensities and their pulse delay and pulse advancement are greater than those of the resonator with loss.These results show that the resonator with gain can be used to control the speed of light and to overcome the pulse loss and distortion in dissipative resonators.
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