Assessment of the orthogonal and non-orthogonal coupled-mode theory for parallel optical waveguide couplers

Bellanca, Gaetano; Orlandi, Piero; Bassi, Paolo

doi:10.1364/josaa.35.000577

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…However, the CMT is only suitable for lossless guided modes. For a high-loss mode like a plasmonic mode, crosstalk is estimated from the normalized coupling length L c /L ave , [56,57] where L ave is the mean L p of the Sym and Asym modes, and n sym and n asym in L c [55] are the real parts of effective refractive indices. Based on the estimation of L c /L ave , one can calculate the maximum transfer power P max [56] from one channel to the other due to limited L p .…”

Section: Spectral Response and Waveguide Crosstalkmentioning

confidence: 99%

“…Moreover, we analyze the fraction of energy density in the slot waveguide versus

t_{{SiO}_{2}}

as shown in Figure 8e. Based on the coupled mode theory (CMT), [ 55 ] the maximum mode coupling occurs in the condition that each of the constituted modes shares the same fraction (from 50% to 50%) of energy density. As a result, the strength of mode coupling between the C m and S n modes can be quantitatively described by the fraction of energy density in slot waveguide.…”

Section: Dependence Of Mode Properties On Geometric and Materials Par...mentioning

confidence: 99%

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Terahertz Waveguides by Coupling Plasmon Polaritons of Cylindrical Metal Wires and a Graphene‐Embedded Slot Waveguide

Huang¹

2023

Advanced Photonics Research

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Transmitting and processing terahertz (THz) signals in a chip‐scale form are tremendously important due to extensive demands for these signals in various applications ranging from sensing, imaging, communication, and spectroscopy. However, developing compact and low‐loss THz devices is still a challenging task. Herein, a novel waveguide structure consisting of a graphene‐embedded slot waveguide sandwiched between two cylindrical metal wires operating in the THz range of f = 1–5 THz is proposed. By appropriately modulating the mode hybridizing from the graphene slot waveguide and cylindrical metal wires, the resultant mode obtains a long propagation distance of 192 μm, while maintaining an ultrasmall mode area of 1.7 × 10−4, thereby achieving an unprecedented high figure of merit (FoM) = 12 985. Compared with other reported structures, the proposed structure outperforms other reported structures in term of FoM, crosstalk, and fabrication difficulty. Furthermore, the degree of integration is evaluated by analyzing crosstalk between adjacent waveguides. With an edge‐to‐edge spacing of 2.7 μm, the power transfer between waveguides can be ignored and the crosstalk is approximately frequency independent. It is believed that the proposed design paves an insightful approach into designing a wider variety of promising THz photonic integrated circuits.

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Section: Spectral Response and Waveguide Crosstalkmentioning

confidence: 99%

“…Moreover, we analyze the fraction of energy density in the slot waveguide versus

t_{{SiO}_{2}}

Section: Dependence Of Mode Properties On Geometric and Materials Par...mentioning

confidence: 99%

Terahertz Waveguides by Coupling Plasmon Polaritons of Cylindrical Metal Wires and a Graphene‐Embedded Slot Waveguide

Huang¹

2023

Advanced Photonics Research

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“…Optical waveguide coupling is widely employed in optical wave steering [11][12][13][14], pure optical switches [15,16], directional couplers [17], and frequency-selective filters [18,19]. The theoretical research and exploration of other applications of waveguide coupling in optics have continued unabated [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and mechanism of coupling effects in parallel-cladded acoustic waveguides

Yin

Yang

et al. 2022

Acta Acust.

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The characteristics and mechanism of coupling effects between parallel cladded acoustic waveguides (PCAWs) are essential when considering their applications in acoustic wave control and signal processing. We investigated its characteristics and revealed the nature of the coupling effect using a theoretical model of two-dimensional PCAWs and simulation experiments. We derived the eigenmode equation describing the behavior of a single waveguide based on the wave acoustic theory and derived analytic expressions for the coupling effects in the PCAWs using the coupled mode theory. Using the finite-element method, we analyzed the waveguide coupling exhibited by this structure given different configurational and acoustic parameter settings. Both theoretical and simulated results indicate that the input wave directed into one of four ports of this structure propagates and tunnels alternately between the two waveguides. Our theoretical model established yields analytic relations between the coupling lengths as well as the dependence on parameters of the evanescent wave and the structure. Analyses indicate wave coupling in the two PCAWs is essentially mediated by the evanescent wave. The unique evolution of the acoustic wave in PCAWs can be employed to develop pure acoustic devices such as frequency-selective filters, directional couplers, and acoustic switches.

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“…In this paper, the supermode theory is applied to the analysis of the MSC [20][21][22][23][24][25][26][27]. It is shown that all characteristic parameters of the MSC can be obtained using only the propagation constants of the supermodes supported by the MSC structure.…”

Section: Introductionmentioning

confidence: 99%

Mode Coupling Analysis for a Mode Selective Coupler Using the Supermode Theory

Ren¹,

Wang²

2022

Photonics

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In this paper, the mode selective coupler (MSC) is analyzed using the supermode theory. It is shown that all characteristic parameters of the MSC can be obtained using the propagation constants of the supermodes supported by the MSC structure. Simulation results show that the characteristic parameters calculated by the supermode theory match well with those calculated by the traditional coupled mode theory (CMT) near the phase matching point of the MSC structure. In practice, the propagation constants of the supermodes can be obtained using common finite element software directly, avoiding the complex double integral in the traditional CMT. This analysis based on the supermode theory gives a deeper insight into the characteristics of the MSC, providing a fast and accurate method for the analysis of MSCs, which is helpful for their design, fabrication and applications.

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Assessment of the orthogonal and non-orthogonal coupled-mode theory for parallel optical waveguide couplers

Cited by 12 publications

References 25 publications

Terahertz Waveguides by Coupling Plasmon Polaritons of Cylindrical Metal Wires and a Graphene‐Embedded Slot Waveguide

Terahertz Waveguides by Coupling Plasmon Polaritons of Cylindrical Metal Wires and a Graphene‐Embedded Slot Waveguide

Characteristics and mechanism of coupling effects in parallel-cladded acoustic waveguides

Mode Coupling Analysis for a Mode Selective Coupler Using the Supermode Theory

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