Highly efficient photonic crystal-based multichannel drop filters of three-port system with reflection feedback

Kim, Sangin; Lim, H.; Kee, Chul‐Sik

doi:10.1364/opex.12.005518

Cited by 110 publications

(58 citation statements)

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“…For instance, this concept may be applied to the transmission of a side-coupled resonator placed between two partially reflecting elements embedded into the photonic-crystal waveguide where sharp and asymmetric line shapes have been predicted with associated variations of the transmission from 0% to 100% over narrow frequency ranges [41]. Similarly, the concept can be extended to a system of cascaded cavities [42] and three-port channel-drop filters [43], optical delay lines [44], systems of two nonlinear resonators with a very low bistability threshold [45], etc. To obtain deeper insight into the basic properties of the effective discrete equations (21), we should know how the coupling coefficients D n (ω), κ n (ω), and V n,m (ω) depend on frequency ω.…”

Section: Discussionmentioning

confidence: 99%

All-optical switching, bistability, and slow-light transmission in photonic crystal waveguide-resonator structures

et al. 2006

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We analyze the resonant linear and nonlinear transmission through a photonic crystal waveguide side-coupled to a Kerr-nonlinear photonic crystal resonator. Firstly, we extend the standard coupled-mode theory analysis to photonic crystal structures and obtain explicit analytical expressions for the bistability thresholds and transmission coefficients which provide the basis for a detailed understanding of the possibilities associated with these structures. Next, we discuss limitations of standard coupled-mode theory and present an alternative analytical approach based on the effective discrete equations derived using a Green's function method. We find that the discrete nature of the photonic crystal waveguides allows a novel, geometry-driven enhancement of nonlinear effects by shifting the resonator location relative to the waveguide, thus providing an additional control of resonant waveguide transmission and Fano resonances. We further demonstrate that this enhancement may result in the lowering of the bistability threshold and switching power of nonlinear devices by several orders of magnitude. Finally, we show that employing such enhancements is of paramount importance for the design of all-optical devices based on slow-light photonic crystal waveguides.

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Section: Discussionmentioning

confidence: 99%

All-optical switching, bistability, and slow-light transmission in photonic crystal waveguide-resonator structures

et al. 2006

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“…As schematically depicted in Fig. 1(a), in wavelength demultiplexers (DEMUXs) operating in a linear dispersion region [12,13], signals with different frequencies will arrive at its regarding arbitrary positioned channel position at different times, since the linear dispersion regime dictates a constant group velocity, leading to asynchronous output signals at the drop channels. On the other hand, in a DEMUX where the main and/or the drop waveguide are systematically slow light engineered, a natural drop channel position can occur for each frequency, so that the narrowband frequencies enter and leave the drop channel nearly synchronized [see Fig.…”

Section: Introductionmentioning

confidence: 99%

Slow light enabled wavelength demultiplexing

Hayran

Turduev

Botey

et al. 2016

2016 18th International Conference on Transparent Optical Networks (ICTON)

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Photonic crystal waveguides supporting band gap guided modes hold great potential to tailor the group velocity of propagating light. We propose and explore different wavelength demultiplexer design approaches that utilize slow light concept. By altering the dielectric filling factors of each waveguide segment, one can show that different frequencies can be separated and extracted at different locations along the cascaded waveguide. Furthermore, to eliminate the inherent reflection loss of such a design, a composite structure involving a tapered waveguide with a side-coupled resonator is also presented. Such a structure features not only a forward propagating wave but also a backward propagating wave acting as a feedback mechanism for the drop channels. We show that by careful design of the waveguide and the resonator, the destructive and instructive interference of these waves can effectively eliminate the reflection loss and increase the coupling efficiency, respectively. Numerical and experimental verification of the proposed structures show that the targeted frequencies can be coupled out with low cross-talks and moderate quality factors, while maintaining a compact size.

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“…On the other hand, point defects coupled to a waveguide lateral to the bus waveguide have also been investigated. Theoretical 100% drop efficiency has been derived in the presence of a reflection feedback formed by a closed waveguide [13] and wavelength selective resonator [14].…”

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confidence: 99%

“…By employing time-reversal symmetry and power conservation and taking the Fourier transform of the respective wave amplitude equations [13,14,16], the transmission efficiency for a single drop channel as a function of angular frequency ω can be derived as…”

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confidence: 99%

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Numerical and experimental demonstration of a wavelength demultiplexer design by point-defect cavity coupled to a tapered photonic crystal waveguide

et al. 2015

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We propose and experimentally demonstrate a demultiplexer with point-defect resonators and a reflection feedback mechanism in a photonic crystal waveguide (PCW). A tapered PCW has been chosen as the necessary reflector, which enhances the drop efficiency. Due to the variation of the single-mode waveguide width of the tapered PCW, spatial alteration of the effective refractive index can be achieved. This phenomenon is used to reflect back the forward propagating wave which is then coupled again to the drop channels via the resonators. High transmission efficiency to the dropout channels is numerically predicted by calculations, either in two-and three-dimensional models, and analytically described by a coupled-mode theory. Moreover, an experimental realization in the microwave regime provides confirmation that the targeted wavelengths can be properly transmitted at the drop channels with low crosstalk and relatively high efficiencies.

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Highly efficient photonic crystal-based multichannel drop filters of three-port system with reflection feedback

Cited by 110 publications

References 0 publications

All-optical switching, bistability, and slow-light transmission in photonic crystal waveguide-resonator structures

All-optical switching, bistability, and slow-light transmission in photonic crystal waveguide-resonator structures

Slow light enabled wavelength demultiplexing

Numerical and experimental demonstration of a wavelength demultiplexer design by point-defect cavity coupled to a tapered photonic crystal waveguide

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