• Title/Summary/Keyword: Rib waveguides

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An Integrated Mach-Zehnder Interferometric Sensor based on Rib Waveguides (Rib 도파로 기반 집적 마흐젠더 간섭계 센서)

  • Choo, Sung-Joong;Park, Jung-Ho;Shin, Hyun-Joon
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.4
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    • pp.20-25
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    • 2010
  • An integrated Mach-Zehnder interferometric sensor operating at 632.8 nm was designed and fabricated by the technology of planar rib waveguides. Rib waveguide based on silica system ($SiO_2-SiO_xN_y-SiO_2$) was geometrically designed to have single mode operation and high sensitivity. It was structured by semiconductor fabrication processes such as thin film deposition, photolithography, and RIE (Reactive Ion Etching). With the power observation, propagation loss measurement by cut-back method showed about 4.82 dB/cm for rib waveguides. Additionally the chromium mask process for an etch stop was employed to solve the core damaging problem in patterning the sensing zone on the chip. Refractive index measurement of water/ethanol mixture with this device finally showed a sensitivity of about $\pi$/($4.04{\times}10^{-3}$).

Polarization-independent and wavelength-insensitive digital optical switch with electro-optic polymer rib waveguides (전기광학 폴리머 립 광도파로를 이용한 편광과 파장에 무관하게 동작하는 디지탈 광스위치)

  • 이상신;신상영
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.34D no.4
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    • pp.79-86
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    • 1997
  • An electro-optic polymer digital optical switch with rib waveguides is designed and fabricated by using the RIE method. POlarization-independent and wavelength-insensitive operation is demonstrated at the wavelengths of 1.3mm and 1.55mm, for the first time in electro-optic polymer-based devices. The rib waveguides have been designed to achieve good guiding properites for both TE and TM polarizations by controlling the etching depth as well as its aspect ratio. Especially theetching depth is controlled to change the guided mode profiles of the rib waveguide and thus to achieve an optimum coupling in the branch. The measured crosstalk is better than -16dB and the extincton ratio of each output port is greater than 16dB.

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Fabrication of buried $Si_3N_4-SiO_2$ rib waveguide Bragg reflectors on Si and calculation of effective reflective indices (Si 기판 $Si_3N_4-SiO_2$ rib형 광도파로의 매립형)

  • 이형종
    • Proceedings of the Optical Society of Korea Conference
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    • 1989.02a
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    • pp.218-221
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    • 1989
  • Buried Bragg reflectors which are immune to the contamination of the surface of an optical waveguide chip are fabricated on Si3N4-SiO2 rib optical waveguides on Si. The effective refractive indices and the bandwidths of the fabricated buried Bragg reflector waveguides are determined by transmission measurement. We show that the measured values of the effective refractive indices are consistent with the calculated values as the width of the waveguide rib varies. Propagation losses of the guided modes due to the leakage into the si substrate are also calculated.

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Analysis and Design of Si3N4 Rib-optical Waveguides for Evanescent-wave Integrated-optical Biosensors (소산파 집적광학 바이오센서에 적합한 Si3N4 립-광도파로 해석 및 설계에 관한 연구)

  • Jung, Hongsik
    • Korean Journal of Optics and Photonics
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    • v.30 no.1
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    • pp.15-22
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    • 2019
  • $Si_3N_4$ rib-optical waveguides for evanescent-wave integrated-optical biosensors were analytically interpreted, to derive the single-mode propagation conditions. The integrated-optical biosensor structure based on two-mode interference was proposed, and the rib width and thickness and core thickness for a single-mode and two-mode waveguide (sensing region) were proposed to be $3{\mu}m$, 2 nm, and 150 nm and $3{\mu}m$, 20 nm, and 340 nm respectively. The optical characteristics of each guided-wave mode were investigated utilizing the film mode-matching (FMM) analysis.

Development of Integrated Optical Filter with New Function -Part 1: Design of Optical Filter (새로운 기능의 집적형 광 Filter의 개발에 관한 연구 제1부 : 광 Filter의 설계)

  • 金東一;Tetsuya Mizumoto;Yoshiyulki Naito
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.23 no.6
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    • pp.833-839
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    • 1986
  • This paper describes the development of a new type of an integrated optical filter using the frequency characteristics of a directly-connected directional coupler with a Rib waveguide. It has been designed for multiplexing and demultiplexing light froups in different wavelength regions. Also, the effects of higher modes, couplings between input waveguides or output waveguides, and dispersion of material are considered.

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Design of Integrated-Optic Biosensor Based on the Evanescent-Field and Two-Horizontal Mode Power Coupling of Si3N4 Rib-Optical Waveguide (Si3N4 립-광도파로의 두-수평모드 파워결합과 소산파 기반 집적광학 바이오센서 설계)

  • Jung, Hongsik
    • Journal of Sensor Science and Technology
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    • v.29 no.3
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    • pp.172-179
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    • 2020
  • We studied an integrated-optic biosensor configuration that operates at a wavelength of 0.63 ㎛ based on the evanescent-wave and two horizontal mode power coupling of Si3N4 rib-optical waveguides formed on a Si/SiO2/Si3N4/SiO2 multilayer thin films. The sensor consists of a single-mode input waveguide, followed by a two-mode section which acts as the sensing region, and a Y-branch output for separating the two output waveguides. The coupling between the two propagating modes in the sensing region produces a periodically repeated optical power exchanges along the propagation. A light power was steered from one output channel to the other due to the change in the cladding layer (bio-material) refractive index, which affected the effective refractive index (phase-shift) of two modes through evanescent-wave. Waveguide analyses based on the rib optical waveguide dimensions were performed using various numerical computational software. Sensitivity values of 12~23 and 65~165 au/RIU, respectively for the width and length of 4 ㎛, and 3841.46 and 26250 ㎛ of the two-mode region corresponding to the refractive index range 1.36~1.43 and 1.398~1.41, respectively, were obtained.

Study on the Design of Mach-Zehnder Type GaAs Waveguide Electro-Optic Modulator (Mach-Zehnder 형 GaAs 광도파로 변조기의 설계 연구)

  • 이종진;김현배;박정호;박진우
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.5
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    • pp.442-451
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    • 1992
  • Mach-Zehnder type GaAs elcetro-optic waveguide modulator has been designed in this paper.The modulator. Considered is based on the Mach-Zehnder interferometer configuration, consisting of two Y branch couping rib type waveguides formed in two epitaxial layers on GaAs substrate. The mode theory on waveguides and electo-optic effect of GaAs were utilized to determine the design parameters for the modulator proposed. Effective index method was applied to design the of waveguide supporting a single mode were calculated to achieve the optimized operation of the modulator. Considering interrelationships between many parameters.

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Implementation of Polarization-Insensitive Directional Coupler using Curved Waveguides (곡면형 도파로를 사용한 편광 무의존성 방향성 결합기의 구현)

  • Ho, Kwang-Chun
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.16 no.1
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    • pp.239-244
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    • 2016
  • The polarization characteristics of polarization-insensitive directional coupler based on double sandwiched rib-type and curved waveguides are explored in detail by using conformal transformation method (CTM) and longitudinal modal transmission-line theory(L-MTLT). To obtain the polarization-insensitive condition of polarization-insensitive curved directional coupler(PI-CDC), the coupling length and coupling efficiency according to the inner radius of PI-CDC are analyzed for quasi-TE and quasi-TM modes. The numerical results show that the PI-CDC with a few micrometer scales can be realized by properly choosing the curvature and structural and material parameters of double sandwiched layers. Furthermore, the mode profiles propagating through PI-CDC are evaluated, and the influence on coupler performance has been investigated.

A Study on the Optimization of Silicon Antiresonant Reflecting Optical Waveguides (ARROW) for Integrated Optical Sensor Applications (집적광학 센서 응용에 적합한 실리콘 비공진 반사형 광도파로 최적화에 관한 연구)

  • Jung, Hong-Sik
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.5
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    • pp.153-160
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    • 2010
  • We optimized the Si(substrate)/$SiO_2$(cladding)/$Si_3N_4$(antiresonant cladding)/$SiO_2$(core)/air multi-layers rib-optical waveguides of antiresonant reflecting optical waveguide (ARROW) for integrated optical biosensor structure utilizing beam propagation method (BPM). Thickness of anti-resonant cladding was derived to minimize the propagation loss and leaky field mode deeply related with evanescent mode was theoretically derived. Depth, width, refractive index and cladding thickness of anti-resonant cladding were numerically calculated into 2.3${\mu}m$, 5${\mu}m$, 1.488, and 0.11${\mu}m$ respectively to minimize propagation loss using the BPM simulation tool. Finally one- and two-dimensional propagation characteristics of ARROW was confirmed.