• Title/Summary/Keyword: Polymeric waveguide

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Optimization of Tilted Bragg Grating Tunable Filters Based on Polymeric Optical Waveguides

  • Park, Tae-Hyun;Huang, Guanghao;Kim, Eon-Tae;Oh, Min-Cheol
    • Current Optics and Photonics
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    • v.1 no.3
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    • pp.214-220
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    • 2017
  • A wavelength filter based on a polymer Bragg reflector has received much attention due to its simple structure and wide tuning range. Tilted Bragg gratings and asymmetric Y-branches are integrated to extract the reflected optical signals in different directions. To optimize device performance, design procedures are thoroughly considered and various design parameters are applied to fabricated devices. An asymmetric Y-branch with an angle of $0.3^{\circ}$ produced crosstalk less than -25 dB, and the even-odd mode coupling was optimized for a grating tilt angle of $2.5^{\circ}$, which closely followed the design results. Through this experiment, it was confirmed that this device has a large manufacturing tolerance, which is important for mass production of this optical device.

Polymeric digital optical switch based on photobleached waveguides (광표백 폴리머 광도파로를 이용한 디지탈 광스위치)

  • 이상신;신상영
    • Korean Journal of Optics and Photonics
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    • v.7 no.4
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    • pp.414-418
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    • 1996
  • An electro-optic polymer digital optical switch was fabricated by using a photobleached waveguide and a self-aligned electrode. It features wavelength insensitive operation, fabrication tolerance and flexible design. And its possible advantages include low coupling losses to the fibers and wide bandwidths. For improving its switching performance, the guided mode profiles of the photobleached waveguides were controlled by photobleaching times to achieve optimized coupling in the branch. And the self-aligned electrode was employed to achieve both efficient overlap of the optical and electric fields and easy introduction of the adiabatically tapered electrodes. The measured crosstalks were better than -21dB at 1.32 ${\mu}{\textrm}{m}$ and 1.55 ${\mu}{\textrm}{m}$, and the extinction ratios of each output port were also more than 20 dB.

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Improvement of Thermal Stability of Optical Current Sensors Based on Polymeric Optical Integrated Circuits for Quadrature Phase Interferometry (사분파장 위상 간섭계 폴리머 광집적회로 기반 광전류센서의 온도 안정성 향상 연구)

  • Chun, Kwon-Wook;Kim, Sung-Moon;Park, Tae-Hyun;Lee, Eun-Su;Oh, Min-Cheol
    • Korean Journal of Optics and Photonics
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    • v.30 no.6
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    • pp.249-254
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    • 2019
  • An optical current sensor device that measures electric current by the principle of the Faraday effect was designed and fabricated. The polarization-rotated reflection interferometer and the quadrature phase interferometer were introduced so as to improve the operational stability. Complex structures containing diverse optical components were integrated in a polymeric optical integrated circuit and manufactured in a small size. This structure allows sensing operation without extra bias feedback control, and reduces the phase change due to environmental temperature changes and vibration. However, the Verdet constant, which determines the Faraday effect, still exhibits an inherent temperature dependence. In this work, we tried to eliminate the residual temperature dependence of the optical current sensor based on polarization-rotated reflection interferometry. By varying the length of the fiber-optic wave plate, which is one of the optical components of the interferometer, we could compensate for the temperature dependence of the Verdet constant. The proposed optical current sensor exhibited measurement errors maintained within 0.2% over a temperature range, from 25℃ to 85℃.

Tunable Polymeric Bragg Grating filter Using Nanoimprint Technique (나노 임프린트 기술을 이용한 폴리머 도파로 기반의 브래그 격자형 파장 가변 필터)

  • Kim, Do-Hwan;Chin, Won-Jun;Lee, Sang-Shin;Ahn, Seh-Won;Lee, Ki-Dong
    • Korean Journal of Optics and Photonics
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    • v.17 no.1
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    • pp.99-103
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    • 2006
  • A tunable wavelength filter was proposed and demonstrated by using the UV nanoimprint technique. It consists of a Bragg grating in polymer waveguides and a heating electrode. The manufacturing of the grating was substantially simplified with the introduction of a smart imprint stamp containing a waveguide pattern integrated with the grating pattern. The center wavelength of the filter was successfully tuned by taking advantage of the thermooptic effect in polymers, which was induced by supplying electrical power to the electrode. For the fabricated device, a transmission dip of ${\~}$15 dB and a 3-dB bandwidth of 0.8 nm were obtained at the Bragg wavelength of ${\~}$l560 nm. The achieved thermooptic tuning efficiency was ${\~}$0.28 nm/mW, while the center wavelength was shifted from 1560 nm to 1558 nm with the electrical power consumption of 7 mW.