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Journal of Modern Optics

Variations of group delay and transmittance with parameters of coupled double-ring resonators

Xin Liu, Mei Kong

Published Feb 1, 2013• 0 citations
Publisher

Abstract

Coupled double-ring resonators (CDRRs) have comprehensive performance–parameter relations. Through finding and analyzing derivatives of group delay and transmittance of CDRRs with respect to coupling coefficients and amplitude transmission factors, influences of these parameters on group delay and transmittance at different conditions are investigated. Combing the parameter conditions for fast or slow light as mode splitting appears, comprehensive performance–parameter relations are provided to illustrate the status of group velocity control and trends of group delay and transmittance variations simultaneously. These relations can be used as a straightforward guidance for parameter choice and optimization of CDRRs for group velocity control applications.

DOI
10.1080/09500340.2013.767391

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The insertion loss of fiber couplers in the two fiber rings waveguide system is studied. The peak power is the same by matching coupler strength of two couplers at the resonant area. The peak transmittance is inversely proportional to the group refractive index regardless of the two reflection values. Group delay increases at the expense of reduction of the peak transmissivity. The three rings waveguide structure manifests the subluminal properties accompanying normal dispersion by doping gain media. Group delay is analyzed in the frequency domain and the time domain, respectively. This study could be regarded as the significant theoretical foundation for applications in the field of controllable light velocity theory, sensors, filters, optical buffers and so on.