Comparison of coupling coefficient variation effects on double couplers structured single ring resonator with single and double beams injection

Hamidah, Maratul; Rahardjo, Sasono; Purnamaningsih, Retno Wigajatri; Poespawati, Nji Raden; Priambodo, Purnomo Sidi

doi:10.1109/qir.2017.8168511

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2021

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“…Compared to the conventional fiber, TCF has a broader range of possible applications in filters and directional couplers [10] [11] [12] [13]. For these applications, the coupling coefficient is one of the most important parameters describing the optical coupling between the cores [14] [15] [16] [17]. Therefore, an accurate calculation of the coupling coefficient is highly important for the design and applications of TCFs.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Coupling Coefficient of Twin-Core Fiber Based on the Supermode Theory with Finite Element Method

Zhao¹,

Ren²,

Yin³

et al. 2021

OPJ

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Currently, coupled mode theory (CMT) is widely used for calculating the coupling coefficient of twin-core fibers (TCFs) that are used in a broad range of important applications. This approach is highly accurate for scenarios with weak coupling between the cores but shows significant errors in the strong coupling scenarios, necessitating the use of a more accurate method for coupling coefficient calculations. Therefore, in this work, we calculate the coupling coefficients of TCFs using the supermode theory with finite element method (FEM) that has higher accuracy than CMT, particularly for the strong coupling TCF. To investigate the origin of the differences between the results obtained by these two methods, the modal field distributions of the supermodes of TCF are simulated and analyzed in detail.

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