Abstract
In this paper we report on the effects of two optical beams counterpropagating in a passive ring resonator that is the building block of a lot of sensing applications. By using the transfer matrix method in combination with the coupled mode theory, the analytical expressions of the power transfer functions for drop and through port configurations are derived in both cases of single beam and double beams inside the ring. The implemented model has shown some improvements in the resonator performance, such as the increase of the transmission power and the reduction of the linewidth, when the interaction between the two beams is considered, with respect to the single beam ring resonator configuration.
Highlights
The ring resonator is an integrated optic structure with an optical feedback allowing a variety of functions such as wavelength filtering, optical switching or optical sensing
In this work we report on an analytical model used to examine the interaction between the longitudinal modes of two counterpropagating beams
From the single beam case, the coupler loses its spatial directionality and an evanescent standing mode is created in the coupling region, so generating two travelling wave (TW) in each bus waveguide
Summary
The ring resonator is an integrated optic structure with an optical feedback allowing a variety of functions such as wavelength filtering, optical switching or optical sensing. In [1]– [4] the behaviour of the ring resonator as a filter with an unidirectional power flow is described. The analysis has been focused on the interaction between two counterpropagating beams having the same frequency. From the single beam case, the coupler loses its spatial directionality and an evanescent standing mode is created in the coupling region, so generating two TWs in each bus waveguide
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