• Title/Summary/Keyword: Diffused Channel Waveguide

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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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    • 1996.05a
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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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Modeling and characteristics of $K^+$ ion-exchanged waveguide-type optical coupler ($K^+$ 이온교환 도파로형 광결합기의 모델링 및 특성)

  • 천석표;박태성;정홍배
    • Electrical & Electronic Materials
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    • v.9 no.3
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    • pp.259-264
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    • 1996
  • In this study, we performed a modeling for $K^{+}$ ion-exchanged diffused channel waveguide and waveguide-type optical coupler by Wentzel-Kramer-Brillouin(WKB) dispersion equation, normalized field distribution equation for mode and coupled mode theory, and examined the optical-power-dividing of the optical coupler fabricated by using the modeling condition. The optical-power-dividing was observed at the waveguide-type optical coupler with 3[.mu.m] line-width, 6[.mu.m] space between channel waveguides, and 3[mm] interaction length.h.

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Electro-Optic Cutoff Modulator on Y-cut LiNbO$_3$ Proton-Diffused Channel Waveguides (Y-cut LiNbO$_3$ 양자확산 광도파로를 이용한 전기광학 차단형 광변조기)

  • 손영성
    • Proceedings of the Optical Society of Korea Conference
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    • 1990.02a
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    • pp.269-273
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    • 1990
  • The proton conserving effect of diffusion with self-aligned SiO2-cladding is investigated by infrared transmission spectra. Based on the proton conserving effect, proton-diffused channel waveguides with self-aligned SiO2-cladding substrates. And an electro-optic cutoff modulator with self aligned electrode that utilizes a single-mode proton-diffused channel waveguide in a Y-cut XX-propagating LiNbO3 substrate is fabricated. Over 20 dB extinction has been achieved with applied voltage of 15V.

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Cutoff Modulator Using a Proton-Diffused $LiNbO_3$ Channel Waveguide (양자확산 $LiNbO_3$ 채널 광도파로를 이용한 차단형 광변조기)

  • Kim, Jong-Sung;Son, Yung-Sung;Lee, Hyung-Jae;Shin, Sang-Yung
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.502-504
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    • 1989
  • An electro-optic cutoff modulator with self-aligned electrode that utilizes a single-mode proton-diffused well-guided channel waveguide in a X-cut Y-propagating $LiNbO_3$ substrate is reported. The self-aligned electrode is formed during proton diffusion process of itself. Nearly linear voltage-intensity relationship has been observed. Over 90 % modulation has been achieved with applied voltage of 25 V.

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Modeling and Characteristics of $K^{+}$ Ion-exchanged Waveguide-type Optical Coupler ($K^{+}$ 이온교환 도파로형 광결합기의 모델링 및 특성)

  • 천석표;박태성;정홍배
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1995.11a
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    • pp.194-197
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    • 1995
  • In this study, we performed a modeling for $K^{+}$ ion-exchanged diffused channel waveguide and waveguide-type optical coupler by WKB(Wentzel-Kramer-Brillouim) dispersion equation, field distribution equation of mode and coupled mode theory, and examined the optical-power-dividing of the optical coupler fabricated by using the modeling condition. The optical-power-dividing was observed at the waveguide-type optical coupler with 3[$\mu\textrm{m}$] line-width, 6[$\mu\textrm{m}$] space between channel waveguides, and 3[mm] interaction length.

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Lithium Niobate (LiNbO3) Photonic Electric-Field Sensors

  • Jung, Hongsik
    • Journal of Sensor Science and Technology
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    • v.31 no.4
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    • pp.194-213
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    • 2022
  • This study comprehensively reviewed four types of integrated-optic electric-field sensors based on titanium diffused lithium-niobate waveguides: symmetric and asymmetric Mach-Zehnder interferometers, 1×2 directional couplers, and Y-fed balanced-bridge Mach-Zehnder interferometers. First, we briefly explain the crystal properties and electro-optic effect of lithium niobate and the waveguide fabrication process. We theoretically analyzed the key parameters and operating principles of each sensor and antennas. We also describe and compare the design, simulation, implementation, and performance tests: dc and ac characteristics, frequency response, dynamic range, and sensitivity. The experimental results revealed that the sensitivity of the sensor based on the Y-fed balanced bridge Mach-Zehnder interferometer (YBB-MZI) was higher than that of the other types of sensors.

LiNbO3 integrated optic devices with an UV-curable polymer buffer layer

  • Jeong, Woon-Jo;Kim, Seong-Ku;Park, Gye-Choon;Lee, Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05b
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    • pp.111-118
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    • 2002
  • A new lithium niobate optical modulator with a polymer buffer layer on Ni in-diffused optical waveguide is proposed for the fist time, successfully fabricated and examined at a wavelength of 1.3 mm. By determining the diffusion parameters of Ni in-diffused waveguide to achieve more desirable mode size which is well matched to the mode in the fiber, the detailed results on the achievement of high optical throughput are reported. In addition, the usefulness of polymer buffer layer which can be applicable to a buffer layer in Ni in-diffused waveguide devices is demonstrated. Several sets of channel waveguides fabricated on Z-cut lithium niobate by Ni in-diffusion were obtained and on which coplanar traveling-wave type electrodes with a polymer-employed buffer layer were developed by a conventional fabrication method for characterizing of electro-optical performances of the proposed device. The experimental results show that the measured half-wave voltage is of ~10 V and the total measured fiber-to-fiber insertion loss is of ~6.4 dB for a 40 mm long at a wavelength of =1.3 mm, respectively. From the experimental results, it is confirmed that the polymer-employed buffer layer in LiNbO3 optical modulator can be a substitute material instead of silicon oxide layer which is usually processed at a high temperature of over $300^{\circ}C$. Moreover, the fabrication tolerances by using polymer materials in LiNbO3 optical modulators are much less strict in comparison to the case of dielectric buffer layer.

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Fabrication of Mach-Zehnder Interferometric Modulator Using Proton-Diffused Channel Waveguide (양자확산 LiNbO$_3$ 광도파로를 이용한 Mach-Zehnder 간섭계 구조의 광변조기 제작)

  • 김종성
    • Proceedings of the Optical Society of Korea Conference
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    • 1990.02a
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    • pp.264-268
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    • 1990
  • A guided-wave electro-optic Mach-Zehnder interferometric modulator was fabricated on X-cut LiNbO3 . The channel waveguides were formed by proton diffusion with self-aligned SiO2-cladding. A mach-Zehnder interferometric modulator with arm lengths of 7mm has been fabricated and tested at 0.6328${\mu}{\textrm}{m}$. Its modulation depth with V$\pi$ of only 3.5V was 85% and the 3dB bandwidth was 1.6KHz. For high speed operation, the electrode dimension should be reduced to have smaller R, L, and C.

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Quasi Phase-Matched Second Harmonic-Wave Generation based on Nonlinear-Optic Effect Utilizing Ti:PPLN Optical Waveguides (Ti:PPLN 광도파로를 이용한 비선형광학 기반의 의사 위상정합 2차 조화파 발생)

  • Jung, Hong-Sik;Jung, Young-Sik
    • Korean Journal of Optics and Photonics
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    • v.19 no.6
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    • pp.408-415
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    • 2008
  • The characteristics of a ferroelectric-domain inverted grating fabricated by applying a high-voltage pulse at room temperature in Ti-diffused channel waveguides in z-cut $LiNbO_3$ (Ti:PPLN) were examined for channel waveguide quasi phase-matched secondharmonic generation devices. The fabrication conditions of uniform periodic domain-inversion were examined. Ti:PPLN with period ${\Lambda}=16.6{\mu}m$ for SHG were fabricated and the performances were measured. A normalized SHG efficiency as high as 473 (%/W) was obtained with 49 mm interaction length.

Ti:PPLN Šolc-type Integrated Optical wavelength filters utilizing polarization-mode conversion for WDM optical networks (편광모드 회전을 이용한 WDM 광 네트워크용 Ti:PPLN Šolc-형 집적광학 파장필터에 관한 연구)

  • Jung, Hong-Sik
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.9 no.4
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    • pp.161-168
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    • 2009
  • We demonstrated $\check{S}$olc-type wavelength filters in periodically poled Ti-diffused lithium-niobate channel optical waveguide (Ti:PPLN). A $\check{S}$olc-type transmission spectrum based on the polarization-mode conversion was observed experimentally in PPLN with period 16.6${\mu}m$. A reasonable explanation of such a phenomenon was presented. A polarization-mode converted transmission peak was observed at wavelength 1272.49nm. The FWHM and sidelobe of spectrum are about 0.23nm and 7 dB, respectively.

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