The Numerical Modeling of 3D Microfiber Couplers and Resonators

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The Numerical Modeling of 3D Microfiber Couplers and Resonators
The Numerical Modeling of 3D Microfiber Couplers and Resonators
Journal Title:
IEEE Photonics Technology Letters
Publication Date:
01 August 2016
G. Wang et al., "The Numerical Modeling of 3D Microfiber Couplers and Resonators," in IEEE Photonics Technology Letters, vol. 28, no. 15, pp. 1707-1710, Aug.1, 1 2016. doi: 10.1109/LPT.2016.2551323
We numerically investigate the optical properties of 3-dimensional (3D) Microfiber/Nanofiber (MNF) couplers and resonators, by using the Finite Difference Time Domain (FDTD) method. It is the first time that the polarization dependent transmission properties of 3D MNF couplers and resonators are investigated numerically. For the knot coupler, the twisted structure contributes to the inter-polarization coupling, and the envelope of intra- and inter- polarization coupling coefficients, respectively, has the trend as a (cosc)2 or (sinc)2 function. For the loop resonator, the inter-polarization coupling coefficients are relatively small. However, the coupling coefficients for both polarization states are discriminated obviously. The high Q-factor resonance spectrum in one polarized state may be overwhelmed by that of the other. We also investigate the mechanism of resonance spectrum splitting, and find out that the inter-polarization coupling at the coupler region degenerates the resonance spectrum and gives rise to the splitting. The results provide guidance to design 3D MNF devices, for example, high Q-factor resonators.
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