• Proceedings of the IEEK Conference
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• 2000.11b
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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.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.87-90
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• 2000

In this paper. we present a method for a systematic design of a dielectric slab polarizer in the circular waveguide. This structure is realized using a tapered dielectric slab inside a circular waveguide. Commercial software is used to obtain the equivalent dielectric constant of the circular waveguide partially filled with a dielectric slab. The length of the tapered region is determined so that the reflection from the dielectric slab is sufficiently low. A polarizer operating at 10 GHz band is designed, fabricated and tested.

• 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.

• 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.

• Journal of the Korean Institute of Telematics and Electronics
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• v.24 no.1
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• pp.15-19
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• 1987

Bandstop characteristics of dielectric waveguide gratings are investigated using the modal approach. First, single step discontinuity of the dielectric waveguide is analyzed in terms of the mode matching method. Then by cascading those discontinuities characteristics of dielectric waveguide gratings are derived. Experimental results at X-band show good agreement with theoretical ones.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.12 no.1
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• pp.36-49
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• 1987

A planar waveguide model is presented for calculating dispersion characteristics of the normalized phase velocity and characteristic impedance with the frequency dependent effective dielectric constand and effective width in microstrip lines of the hybrid mode. Eeff(f) and Weff(f) are applied to a planar waveguide model by using an empirical relations and formula designed for CAD purposes as a function of frequency. A wide range of relative dielectric constants and the strip $h_{width}$strate height(W/h ratios), $0.5$\leq$W/h\leq2.5$ are used. These results are compared with static value, spectral domain analysis, and empirical results. As the result of a computer simulation, in the case of using a planar waveguide model, the frequency dependent normalized phase velocity is more closely approached to 1/ and characteristic impedance is more increased than the other method that has already been presented as the increasing of the frequency. And, the case of applying Eeff(f) designed for the purpose of CAD to this proposed model is show in better result than the case of using a empirical relations.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.5
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• pp.508-514
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• 2013

Substrate integrated waveguide(SIW) constructed by two metal planes and conductive vias in a dielectric substrate, have all the conductors connected each other and hence, cannot be biased by DC sources. We propose a new folded corrugated substrate integrated waveguide(FCSIW) that can be DC-biased. Since the proposed FCSIW replaces the SIW conducting vias by folded open subs, it can supply the DC sources. The FCSIW has better transmission characteristics and 30 % less width than the common corrugated substrate integrated waveguide(CSIW) having a serious leakage generation problem. The FCSIW shows better insertion loss(1.49 dB) compared with that(3.08 dB) of the CSIW measured for 154 mm length devices and averaged at 9~15 GHz frequency band. No leakage has been observed from crosstalk measurements of the FCSIW.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.7
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• pp.50-55
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• 1999

We have fabricated optical waveguide which utilizes intermixing of InGaAs/InGaAsP multi quantum well separate confinement heterostructure. The waveguide was fabricated by reactive ion etching technique using $CH_4/H_2$ gas mixture, and the width and depth of the waveguide ware $5{\mu}m$ and $1.2{\mu}m$, respectively. The propagation loss of the waveguide was measured by Fabry-Perot interference phenomena using tunable laser. For the waveguide after $800^{\circ}C$, 30s heat treatment, the measured loss was 3.76dB/cm and 3.95dB/cm for TE and TM mode, respectively. This value is very small compared to other waveguide made by IFVD technique. Hence, this technique can applied to integration of waveguide and electronic devices.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.7
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• pp.1652-1656
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• 2014

In this work, we demonstrated a 77 GHz waveguide VCO with transition from WR-12 to WR-10 for anti-collision radar applications. The fabricated waveguide VCO consists of a GaAs-based Gunn diode, a varactor diode, a waveguide transition, and two bias posts for operating as a LPF and a resonator. The cavity is designed for fundamental mode at 38.5 GHz and operated at second hormonic of 77 GHz. The waveguide transition has a 1.86 dB of insertion loss and -30.22 dB of S11 at the center frequency of 77 GHz. The fabricated VCO achieves an oscillation bandwidth of 870 MHz. Output power is from 12.0 to 13.75 dBm and phase noise is -100.78 dBc/Hz at 1 MHz offset frequency from the carrier.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.27 no.3
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• pp.156-161
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• 2014

We have investigated the optical properties of plamonic waveguide with tapered structure based on InP material for photonic integrated circuit(PIC). The proposed plasmonic waveguide is covered with the Ag thin film to generate the plasmonic wave on metallic interface. The optical characteristics of plasmonic waveguide were calculated using the three-dimensional finite-difference time-domain method. The plasmonic waveguide was fabricated with the lengths of 2 to $10{\mu}m$ and the widths of 400 to 700 nm, respectively. The plasmonic mode and optical loss were measured. The optimum plasmonic length is $10{\mu}m$ and widths are 600 and 700 nm in the fabricated waveguide. This plasmonic waveguide can be directly integrated with other conventional optical devices and can be essential building blocks of PIC.