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Optics Communications

Group delay and dispersion characteristics of a nested cross-coupled microring resonator (NeXMRR)

Mae M. Garcillanosa, Wang Sy, Benjamin B. Dingel, Jennifer C. Dela Cruz

Published Feb 17, 2026• 1 citation
Publisher
DOI
10.1016/j.optcom.2026.133035

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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.