• Title/Summary/Keyword: Waveguide

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Bus-waveguide-width Dependence of Evanescent Wave Coupling in a Microring Resonator

  • Son, Seong-Jin;Kim, Suyeon;Yu, Nan Ei;Ko, Do-Kyeong
    • Current Optics and Photonics
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    • v.5 no.5
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    • pp.538-543
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    • 2021
  • The evanescent wave coupling of a microring resonator is controlled by changing the gap distance between the bus waveguide and the microring waveguide. However, the interdependence of the bus waveguide's width and the coupling is not well understood. In this paper, we investigate the dependence of coupling strength on the bus waveguide's width. The strength of the evanescent wave coupling is analytically calculated using coupled-mode theory (CMT) and numerically calculated by three-dimensional finite-difference-time-domain (FDTD) simulation. The analytic and numerical simulation results show that the phase-matching condition in evanescent wave coupling does not provide maximum coupling strength, because both phase-matching and mode confinement influence the coupling. The analytic and simulation results for the evanescent coupling correspond to the experimental results. The optimized bus-waveguide width that provides maximum coupling strength results in intrinsic quality factors of up to 1.3 × 106. This study provides reliable guidance for the design of microring resonators, depending on various applications.

A Study on the Rectangular Waveguide Phase-Shifter Partially Loaded with a Rectangular Dielectric Slab (구형 유전체판이 삽입된 구형도파관 이상기에 관한 연구)

  • 박병우;이상설
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.15 no.10
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    • pp.850-856
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    • 1990
  • Generally, the waveguide phase-shifter has been analyzed by the modal expansion method. We can not apply this method in the case which is difficult to choose a nenerating function. In this paper, we are analyzed the rectangular waveguide phase shifter using the perturbation method. When the depth of dielectric slab is smaller then one half of the waveguide height, the experimental results are well agreed with the calculated values by this method.

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Analysis of the Coplanar Waveguide Shielded by Rectangular Waveguide (구형 도파관으로 차폐된 코플래너 도파관 해석)

  • 황정섭;이상설
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.30A no.7
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    • pp.19-25
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    • 1993
  • By using the point matching method, the coplanar waveguide shielded by the rectangular waveguide has been analyzed. The particular potential solution of C.P.W has been obtained from the boundary condition by using the point matching method. The line capacitance has been obtained from the total charge of the center conductor per length. The effective dielectric constant and the line impedance have been obtained from the line capacitance of C.P.W.

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Control of Hydroxyl Group Content in Sol-Gel-Derived Sols for Waveguide Optical Matrix (Waveguide Optical Matrix 용 졸-겔 코팅졸의 OH 함량 제어)

  • 안복엽;석상일;김주현;권정오
    • Proceedings of the Materials Research Society of Korea Conference
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    • pp.55-55
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    • 2003
  • Recently, with the rapid development of the waveguide division multiplexing (WDM) systems for large capacity and flexibility of information network, the broad band 1.5$\mu\textrm{m}$ erbium-doped waveguide amplifier (EDWA) become important. The main factors affecting the performance of sol-gel-based waveguides are non-radiative relaxation channels due to rare-earth concentration quenching and to vibration of the OH groups Therefore, the sol-gel process has to be carefully controlled in order to minimize the residual OH content.

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Optimal Design of Dielectric-loaded Surface Plasmon Polariton Waveguide with Genetic Algorithm

  • Jung, Jae-Hoon
    • Journal of the Optical Society of Korea
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    • v.14 no.3
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    • pp.277-281
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    • 2010
  • We propose a design and optimization method for a dielectric-loaded surface plasmon polariton waveguide using a genetic algorithm. This structure consists of a polymer ridge on top of two layers of substrate and gold film. The thickness, width and refractive index of the ridge are designed to optimize the figures of merit including mode confinement and propagation length. The modal analysis combined with the effective index method shows that the designed waveguide exhibits a fundamental propagation mode with high mode confinement while ensuring that the propagation loss remains relatively low.

Embodiment of all-optical switching phenomena on a GaAs waveguide

  • Lee, Sang-Jae
    • Journal of Sensor Science and Technology
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    • v.5 no.5
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    • pp.85-95
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    • 1996
  • Based on the transmission of coupled gap solitons in nonlinear periodic media, we present an all-optical switching scheme which has a novel architecture and principle. The proposed switch with an extremely small switching element can be realized on a semiconductor waveguide. We here investigate the switching performance with a GaAs waveguide in order to give criteria for the experimental realization of the all-optical switching phenomena. We also suggest a variation of an index-matching scheme to solve the technical problem such as the input-energy coupling into a periodic waveguide.

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A Study of Slow Wave Microwave Waveguide on Period Boundary (주기경계를 갖는 지파 마이크로파 도파관의 연구)

  • Kim, Won-Sop
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.4
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    • pp.461-464
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    • 2009
  • The characteristics of slow wave structure employed for backward wave oscillators expected to be a high power microwave source are studied analyytically. The slow wave structure is a sinusoidally corrugated wall waveguide. The waveguide is designed and fabricated by cast aluminun. The dispersion relation and transmitted characteristics for microwaves are measured in the air. There exist literatures on high efficiency of enhanced radiation from backward wave oscillators involving plasma studied experimentally.

Optimal Design of Dielectric-Filled Plasmonic Slot Waveguide with Genetic Algorithm

  • Kim, Daekeun;Jung, Jaehoon
    • Journal of the Optical Society of Korea
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    • v.16 no.1
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    • pp.70-75
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    • 2012
  • An optimization methodology for designing a dielectric-filled plasmonic slot waveguide is presented. The genetic algorithm combined with a rigorous analysis based on the finite element method is used to optimize a nano-scaled plasmonic slot waveguide to have high mode confinement and a long propagation length, for which the objective function is defined as a figure of merit combining both propagation parameters.

Operational Properties of Ridge Waveguide Lasers with Laterally Tapered Waveguides for Monolithic Integration

  • Kwon, Oh-Kee;Kim, Ki-Soo;Sim, Jae-Sik;Baek, Yong-Soon
    • ETRI Journal
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    • v.29 no.6
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    • pp.811-813
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    • 2007
  • We report on a ridge waveguide laser diode with laterally tapered waveguides fabricated in a single growing step using a double patterning method. In this structure, nearly constant output power is obtained with the change of the lower tapered waveguide width, and the facet power ratio of 1.4 to 1.5 is observed over the current range. The asymmetric facet power property is also investigated.

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Optical coupling propertis between side-polished fiber and metal-clad planar waveguide (측면 연마된 광섬유와 금속 클래드 평면도파로사이의 광결합특성)

  • 허상휴;김광택;이점식;마재평;정웅규;강신원;손경락;송재원
    • Proceedings of the IEEK Conference
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    • pp.253-256
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    • 2000
  • We report the experimental results for the coupling properties of the an side-polished single-mode fiber covered with metal-clad planar waveguide. The experimental results show that the large birefringence of a metal-clad planar waveguide facilitates the effective separation of TE and TM polarization in the spectral domain. Additionally the resonant wavelengths of the device are tuned based in the thermo-optic effect of polymer planar waveguide.

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