• Title/Summary/Keyword: Waveguide

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Planar Optical Waveguide Temperature Sensor Based on Etched Bragg Gratings Considering Nonlinear Thermo-optic Effect

  • Ahn, Kook-Chan;Lee, Sang-Mae;Jim S. Sirkis
    • Journal of Mechanical Science and Technology
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    • v.15 no.3
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    • pp.309-319
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    • 2001
  • This paper demonstrates the development of optical temperature sensor based on the etched silica-based planar waveguide Bragg grating. Topics include design and fabrication of the etched planar waveguide Bragg grating optical temperature sensor. The typical bandwidth and reflectivity of the surface etched grating has been ∼0.2nm and ∼9%, respectively, at a wavelength of ∼1552nm. The temperature-induced wavelength change is found to be slightly non-linear over ∼200$^{\circ}C$ temperature range. Typically, the temperature-induced fractional Bragg wavelength shift measured in this experiment is 0.0132nm/$^{\circ}C$ with linear curve fit. Theoretical models with nonlinear temperature effect for the grating response based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance.

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Design of Dual-Polarized Waveguide Slot Array Antenna for Synthetic Aperture Radar (영상레이더용 이중편파 도파관 슬롯 안테나 설계)

  • Yi, Dong-Woo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.11 no.3
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    • pp.138-145
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    • 2008
  • In this paper, the waveguide slot array antenna which is capable of wide beam steering and dual polarization is designed for an X band synthetic aperture radar. In order to improve the restriction of beam steering range and to remove the butterfly lobes, a typical waveguide slot array antenna has been modified. To implement dual polarization, rod excited waveguide slot elements and ridge waveguide slot elements are alternately arranged. Location of slots, inclination of rod and offset distance of slots are determined on using array characteristic and conductance constant with radiating power on slots. The designed antenna is manufactured and measured with Near-filed measurement method.

The Integrated Surface Plasmon Resonance Sensor using Polymer Optical Waveguide (폴리머 광도파로를 이용한 집적형 표면 플라즈몬 공명 센서)

  • Oh, Geum-Yoon;Kim, Doo-Gun;Kim, Hong-Seung;Lee, Tae-Kyeong;Choi, Young-Wan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.433-436
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    • 2012
  • We propose a novel micro surface plasmon resonance (SPR) sensor system based on polymer materials. The proposed SPR system consists of the incident medium with polymer waveguide and the gold thin film for sensing area. Using a polymer optical waveguide instead of a prism in SPR sensing system offers miniaturization, low cost, and potable sensing capability. The whole device performance was analyzed using the finite-difference time domain method. The optimum gold thickness in the attenuated total reflection mirror of polymer waveguide is around 50 nm and the resonance angle to generate surface plasmon wave is 68 degrees.

Optical Waveguide Analysis by using the FDTD Method (FDTD법을 이용한 광도파로 해석)

  • Kim, Tae Yong;Lee, Hoon-Jae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.59-60
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    • 2013
  • In order to analyze optical waveguide, the FDTD method can be applied. But structure of optical waveguide is relatively larger than wavelength of center frequency. But optical waveguide system must be periodic structure and the solution of the waveguide can be obtained from a simulation in one period of the structure by applying PBC(Periodic boundary condition). In this paper, an efficient FDTD algorithm incorporating PBC in inhomogeneous medium is introduced and estimated.

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The optical coupling characteristics of $K^{+}$ and $Ag^{+}$ ion-exchanged waveguide ($K^{+}$$Ag^{+}$ 이온교환 도파로의 광결합 특성)

  • 김홍석;이병석;천석표;이현용;정흥배
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.284-287
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    • 1996
  • In this paper, we investigated the optical coupling characteristics for $K^{+}$ ion-exchanged diffused channel waveguide by using coupled-mode equations. In this case, the optical-power-dividing was observed at the waveguide-type optical coupler with 3[$\mu\textrm{m}$] line-width and, 6[$\mu\textrm{m}$] separation between channel waveguides in which interaction lengths were 1 and 3[mm], respectively, On the basis of that we deformed simulation for $Ag^{+}$ ion-exchanged diffused channel waveguide. As a result of simulation, the optical-power-dividing was shown at the waveguide-type optical coupler wish 3[$\mu\textrm{m}$] line-width, 6[$\mu\textrm{m}$] separation between channel waveguides and 0.11[mm] interaction length.

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Analysis of a coupled waveguide structure using the edge element method (변유한요소법을 이용한 결합구조를 갖는 도파관 구조의 해석)

  • Kim, Young-Tae;Kwon, Jin-Ho;Ahn, Dal;Park, Jun-Seok;Kim, Hyeong-Seok
    • Proceedings of the KIEE Conference
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    • pp.1117-1119
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    • 1999
  • An edge finite element method is applied to calculate the field distribution of a coupled waveguide structure. We compares a node based finite element method with the edge element one. For 2-d eigenvalue problems of waveguide structures, the former generates spurious eigenmodes, but the latter dose not. Using an simple rectangular waveguide, we implement both methods to obtain some results of field computation in waveguide. The paper shows that the finite element method using edge elements succeeds in suppressing spurious solutions.

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Analysis of Scattering Matrix for the Open-ended Rectangular Waveguide with Infinite Flange (무한한 플랜지가 장착된 개방형 직사각형 도파관 구조에 대한 산란 행렬 해석)

  • Ko, Ji-Whan;Cho, Young-Ki
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.3
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    • pp.407-413
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    • 2008
  • In this paper, scattering matrix for the open ended rectangular waveguide with infinite flange is derived. To validate the scattering matrix approach, load admittance $Y_{L,10}$ obtained from the present scattering matrix method is compared with the results of the previous work. The convergence for scattering matrix solution versus TE and TM mode numbers is investigated. Also far field power pattern radiated from the aperture of the waveguide is given.

Design and Analysis of Refractometer Based on Bend Waveguide Structure with Air Trench for Optical Sensor Applications

  • Ryu, Jin Hwa;Lee, Woo-Jin;Lee, Bong Kuk;Do, Lee-Mi;Lee, Kang Bok;Um, Namkyoung;Baek, Kyu-Ha
    • ETRI Journal
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    • v.36 no.5
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    • pp.841-846
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    • 2014
  • This study proposes a novel optical sensor structure based on a refractometer combining a bend waveguide with an air trench. The optical sensor is a $1{\times}2$ splitter structure with a reference channel and a sensing channel. The reference channel has a straight waveguide. The sensing channel consists of a U-bend waveguide connecting four C-bends, and a trench structure to partially expose the core layer. The U-bend waveguide consists of one C-bend with the maximum optical loss and three C-bends with minimum losses. A trench provides a quantitative measurement environment and is aligned with the sidewall of the C-bend having the maximum loss. The intensity of the output power depends on the change in the refractive index of the measured material. The insertion loss of the proposed optical sensor changes from 3.7 dB to 59.1 dB when the refractive index changes from 1.3852 to 1.4452.

40 GHz Vertical Transition with a Dual-Mode Cavity for a Low-Temperature Co-fired Ceramic Transceiver Module

  • Byun, Woo-Jin;Kim, Bong-Su;Kim, Kwang-Seon;Eun, Ki-Chan;Song, Myung-Sun;Kulke, Reinhard;Kersten, Olaf;Mollenbeck, Gregor;Rittweger, Matthias
    • ETRI Journal
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    • v.32 no.2
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    • pp.195-203
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    • 2010
  • A new vertical transition between a substrate integrated waveguide in a low-temperature co-fired ceramic substrate and an air-filled standard waveguide is proposed in this paper. A rectangular cavity resonator with closely spaced metallic vias is designed to connect the substrate integrated waveguide to the standard air-filled waveguide. Physical characteristics of an air-filled WR-22 to WR-22 transition are compared with those of the proposed transition. Simulation and experiment demonstrate that the proposed transition shows a -1.3 dB insertion loss and 6.2 GHz bandwidth with a 10 dB return loss for the back-to-back module. A 40 GHz low-temperature co-fired ceramic module with the proposed vertical transition is also implemented. The implemented module is very compact, measuring 57 mm ${\times}$ 28 mm ${\times}$ 3.3 mm.

Directivity compensation of crossed waveguide directional coupler (교차도파관 방향성결합기의 방향성 성능 개선)

  • Kim, Dong-Hyun;Yang, Doo-Yeong
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.9
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    • pp.63-69
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    • 2007
  • The directivity of crossed waveguide directional coupler is generally decreased according as coupling coefficient of it increase. In this paper, the geomertical parameters of crossed slot pair for directivity improvement is modified and the formulas for design of it are proposed. The crossed waveguide directional coupler designed upon the formulas is fabricated with the WR42 waveguide in K-band. The measured results show that the coupling coefficient is 21.5 dB and directivity is minimum 23.9 dB over the operating frequency from 18GHz to 26.5GHz.