• Title/Summary/Keyword: 평면도파로

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Elimination of polarization dependency of fiber-to-planar waveguide couplers using a half-waveplate (반파장판을 이용한 광섬유-평면도파로 결합기의 편광 의존성 제거)

  • Lee, Kyu-Hyo;Kim, Hyo-Kyeom;Kim, Kwang-Taek
    • Korean Journal of Optics and Photonics
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    • v.16 no.2
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    • pp.138-142
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    • 2005
  • In this paper, a method to eliminate the polarization dependent properties of fiber-to-planar waveguide couplers using a thin half-waveplate is proposed and demonstrated. The operation principle of the device is explained and the fabrication technology is presented. It is experimentally shown that the resonance wavelengths of the device are independent of the polarization state of input light.

Fabrication of gratings in Planar Lightwave Circuits for External Cavity Laser (외부 공진기 레이저 구현을 위한 평면도파로 격자 제작)

  • Lim, Jong-Hoon;Lim, Gun;Lee, Kyung-Shik;Song, Jeong-Hwan;Cho, Jae-Geol;Jung, Sun-Tae;Oh, Yun-Kyung
    • Korean Journal of Optics and Photonics
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    • v.15 no.6
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    • pp.490-494
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    • 2004
  • Bragg gratings were fabricated in Ge-doped silica planar lightwave circuits (PLC) for different writing conditions to study the growth characteristics. The refractive index modulation of the gratings grew in the PLC with total fluence F according to the power law $\Delta$n=A $F^{B}$. The characteristics of the PLC gratings formed for external cavity lasers match closely to those predicted by the power law. The oscillation spectra of the FP-LD with a Bragg grating grown in the PLC waveguide were also presented.d.

Study on the photo-induced refractive index change of diarylethene derivative using fiber-to-planar waveguide coupler (광섬유-평면도파로 결합기를 이용한 광변색성 디아릴에텐 유도체의 광유도 굴절률 변화에 관한 연구)

  • 조강민;윤정현;임선정;박수영;강신원
    • Korean Journal of Optics and Photonics
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    • v.15 no.2
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    • pp.109-113
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    • 2004
  • We have manufactured and characterized the fiber-to-Planar Waveguide Coupler for analysis of the photo-induced refractive index change of DM-BTE .(l,2-bis[2,5-dimethylthio-phen-3-yl]-hexafluorocyclopentene) When irradiated with ultraviolet light, the colorless diarylethene(DM-BTE)-crystal turned red while keeping the crystal shape. The red color was bleached by irradiation with visible light(λ>450 nm). The resonant wavelength was shifted and recovered owing to the refractive index variation of the planar waveguide because of its photo-functional properties on exposure to UV and visible light. The wavelength responses of this switch by UV exposure were measured as 0.057 nm/sec with saturation time of 60 seconds. and when illuminated by visible light, resonance wavelength variations were measured as 0.028 nm/sec, with recovery time of 140 seconds.

High-sensitivity temperature sensor using the side polished single mode fiber and polymer planar waveguide coupler (측면연마된 단일모드 광섬유와 폴리머 평면도파로 결합기를 이용한 고감도 온도센서)

  • Jeong, Ung-Gyu;Kim, Sang-U;Kim, Gwang-Taek;Kim, Eung-Su;Yu, Yun-Sik;Gang, Sin-Won
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.39 no.1
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    • pp.39-46
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    • 2002
  • High-senstivity temperature sensor based on the wavelength selectivity of single mode fiber-to-planar waveguide coupler, was demonstrated. The resonant wavelength of the coupler was shifted with large rate of -3.43nm/$^{\circ}C$ owing to good thermo-optic effects of polymer planar waveguide. The device design technique to reduce the polarization dependent properties and increase the temperature sensitivity was presented.

Measurement of Behaviors of Optical Filter using Evanescent Field Coupling between Single Mode Fiber and Multimode Planar Waveguide (단일모드 광섬유와 다중모드 평면도파로의 소산장결합을 이용한 광필터의 동작특성 측정)

  • Kim, Kwang-Taek;Yu, Ho-Jong;Song, Jae-Won;Kim, Si-Hong;Kang, Shin-Won
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.7
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    • pp.42-49
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    • 1999
  • In this paper, we proposed a simple measurement method to find the behaviors of the fiber-to-waveguide coupler. The polished fiber blocks and planar waveguides on silicon dioxide were fabricated independently and then optically coupled by physical pressure. Several kinds of polymer with different refractive indices were used for waveguide films. The proposed method makes it possible to measure the center wavelength, bandwidth, extinction ratio, and polarization dependence of the coupler during fabrication procedure. The wavelength sensitivity increased with refractive index of polymer. The symmetric planar waveguide structure and isotropic property of guiding materials reduced polarization dependent property. Insertion loss of the coupler was less than 0.5dB. It is expected that our measurement method is useful for developing various optical devices using evanescent coupling between polished fiber and planar waveguide such as optical modulators and filters etc.

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Thermo-Optically Tunable Filter Using Evanescent Field Coupling Between Side-Polished Polarization Maintaining Fiber and Polymer Planar Waveguide (측면 연마된 편광유지 광섬유와 폴리머 평면도파로 사이의 소산장 결합을 이용한 열 광학 가변 필터)

  • 윤대성;김광택
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.2
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    • pp.33-38
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    • 2004
  • We have demonstrated a tunable Inter based on an asymmetric directional coupler made of a side-polished polarization maintaining fiber coupled with a polymer planar waveguide. The thermo-optic effects of the polymer planar waveguide induced by a micro-strip heater placed on the top layer of the device leads to shift of resonance wavelength of the coupler. The fabricated device exhibited wide tunable range exceeding 230 nm with 720 ㎽ of applied electrical power.

Fiber optic temperature sensor using evanescent field coupling of the thermo-optic polymer planar waveguide (열광학 폴리머 평면도파로의 소산장결합을 이용한 광섬유형 온도센서)

  • Kim, Si-Hong;Jung, Woong-Gyu;Kim, Kwang-Tack;Song, Jae-Won;Kang, Shin-Won
    • Journal of Sensor Science and Technology
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    • v.9 no.1
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    • pp.15-21
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    • 2000
  • Optical fiber temperature sensor, using resonance wavelength shifting of single mode fiber-to-planar waveguide coupler by heat, was fabricated. Thermo-optic polymers, have large change of refractive index due to heat, were used for planar waveguide. The device fabrication procedure including fiber polishing steps was illustrated and the device structure with independent polarization was demonstrated experimentally. The resonance wavelength difference of fabricated device was less than 2nm. The resonance wavelength shifting owing to temperature variation, from room temperature($24^{\circ}C$) to $90^{\circ}C$, was showed $-0.54nm/^{\circ}C$, $-3nm/^{\circ}C$.

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The guided field distribution characteristics in the ion-exchange channel glass waveguide (이온 교환 채널 유리 도파로의 도파광 분포특성)

  • 박정일;박태성;천석표;정홍배
    • Electrical & Electronic Materials
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    • v.8 no.3
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    • pp.332-339
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    • 1995
  • In this paper, it was investigated the guided field intensity distribution of the channel in the silver & potassium ion-exchange glass-waveguide. The guided field intensity distribution analysis of ion-exchange glass-waveguide was based on the combination of the WKB dispersion relationship method with a Gaussian distribution function of refractive index profile and the Field Shadow method to the modeling of the channel waveguide. As the results of the channel waveguide modeling, it was represented 2-dimensional and 3-dimensional field distribution of ion-exchange glass waveguide.

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