• Title/Summary/Keyword: Polymeric waveguide

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Photonic Glucose Sensor Using a Vertically Coupled Polymeric Microdisk Resonator (수직 결합형 폴리머 마이크로디스크 공진기를 이용한 광학적 글루코스 센서)

  • Kim, Gun-Duk;Son, Geun-Sik;Lee, Hak-Soon;Kim, K-Do;Lee, Sang-Shin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.8
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    • pp.1412-1415
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    • 2008
  • A glucose biosensor using a microdisk resonator in polymeric waveguides was developed by observing either the shift in the resonant wavelength or the variation in the optical power. The deformation in the transfer curve of the vertically coupled resonator sensor resulting from the variation in the disk-to-ring coupling, which was incurred by the application of the target analyze, was suppressed. And the refractive index of the polymeric waveguide was devised to closely follow that of the analyze itself for enhancing the sensitivity of the sensor. The sensitivity and measurement range were observed to be respectively 0.14 pm/(mg/dL) and 1500 mg/dL (theoretically up to 4700 mg/dL, for the wavelength shift method and 0.04 dB/(mg/dU and 140 mg/dL the power variation scheme.

Large core polymeric single mode waveguide for passive fiber alignment (광섬유 수동정렬을 위한 단일 모드 대형 코어 폴리머 광도파로)

  • Cho, Su-Hong;Beak, Yu-Jin;Oh, Min-Choel
    • Korean Journal of Optics and Photonics
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    • v.16 no.1
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    • pp.79-84
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    • 2005
  • To increase the tolerance for passive fiber alignment, a single mode polymer waveguide with a large core structure is demonstrated. The large core waveguide is designed to have a mode profile comparable to that of a thermally expanded core (TEC) fiber, and it can be connected to a high-contrast waveguide through an adiabatic transition taper structure. From a waveguide with a rectangular core of 25 ${\times}$ 25 ${\mu}{\textrm}{m}$$^2$, a single mode propagation is observed when the index contrast is as low as 0.0005. A UV-cured injection molding method is used to fabricate the thick core structure. Due to the large mode size, the insertion loss of the device is below 0.5 dB until the lateral displacement of the TEC fiber is 4.5 ${\mu}{\textrm}{m}$. The low insertion loss is important for reproducible passive alignment.

Polymeric Ring Resonator with Variable Extinction Ratio (소멸비가 가변되는 폴리머 링 레조네이터)

  • Song, Ju-Han;Kim, Do-Hwan;Lee, Sang-Shin
    • Korean Journal of Optics and Photonics
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    • v.17 no.4
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    • pp.342-346
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    • 2006
  • A polymeric ring resonator with electrically variable extinction ratio at resonant wavelengths has been proposed and demonstrated. It consists of a ring waveguide coupled to a straight bus waveguide and a modulating electrode, which is formed in the outer cladding region outside of the ring. When electrical power is applied to the electrode, the refractive index of the polymers underneath the electrode is lowered to strengthen the confinement of the guided mode of the ring and thus the equivalent effective refractive index felt by the mode is decreased. Therefore, the propagation loss of the guided mode is reduced with the applied electrical power Consequently the extinction ratio at resonant wavelengths is varied by the electrical power. For the achieved results, the extinction ratio was changed by about 9 dB for the electrical power of 12 mW, when the propagation loss of the ring was reduced by 80 dB/cm.

Refractometric Glucose Biosensor Incorporating a Vertically Coupled Microring Resonator in Polymeric Waveguides (수직형 폴리머 마이크로링 공진기 기반의 글루코스 바이오 센서)

  • Kim, Gun-Duk;Son, Keun-Sik;Lee, Hak-Soon;Kim, Ki-Do;Lee, Sang-Shin
    • Korean Journal of Optics and Photonics
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    • v.19 no.2
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    • pp.127-131
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    • 2008
  • A refractometric glucose biosensor incorporating a vertically coupled microring resonator in polymers was proposed and realized. The ring was covered with a target analyte of glucose solution with a certain concentration, so that its effective refractive index could be altered and, as a result, the resonance wavelength of the sensor was shifted. Therefore the concentration of the glucose solution can be estimated by observing the shift in the resonance wavelength. Two schemes were exploited for enhancing the sensitivity of the sensor. First, the effective refractive index of the polymeric waveguide used for the resonator sensor was adjusted to approach that of the target analyte as best as possible. Second, the ring waveguide, which serves as a crucial sensing part, was appropriately over-etched to enlarge its contact area with the analyte. The proposed resonator sensor was designed with the beam propagation method. The refractive indices of the core and cladding polymer involved were 1.430 and 1.375 respectively, leading to the waveguide's effective refractive index of ${\sim}1.390$, which is faiirly close to that of the glucose solution of ${\sim}1.333$. The prepared ring resonator with the $400-{\mu}m$ radius exhibited the free spectral range of 0.66 nm, the bandwidth of 0.15 nm, and the quality factor of 10,000. For the sensor operating at 1,550 nm wavelength, the achieved sensitivity was as great as 0.28 pm/(mg/dL), which is equivalent to 200 nm/RIU.

Vertical Coupling of Polymeric Double-Layered Waveguides Using a Stepped MMI Coupler

  • Lee, Jong-Moo;Ahn, Joon-Tae;Cho, Doo-Hee;Ju, Jung-Jin;Lee, Myung-Hyun;Kim, Kyong-Hon
    • ETRI Journal
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    • v.25 no.2
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    • pp.81-88
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    • 2003
  • We designed a multimode interference (MMI) coupler to use in vertical coupling of double layered polymeric waveguides and analyzed the coupling characteristics by comparing our experimental and simulation results. We found that our proposed new structure, a stepped MMI coupler, is effective in vertical coupling between waveguide layers with a short length of MMI and has a high tolerance for the variation in the structure of an MMI coupler that can be induced as errors in the fabrication process.

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High Performance Polymeric Optical Waveguide Devices (고성능 폴리머 광도파로 소자)

  • O, Min-Cheol;No, Yeong-Uk;Lee, Hyeong-Jong
    • Proceedings of the Optical Society of Korea Conference
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    • 2005.02a
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    • pp.292-295
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    • 2005
  • Variable optical attenuators (VOA) made of low-loss fluorinated polymers are demonstrated which shows a low operating power less than 30 mW due to the superior thermo-optic effect of polymer material and a low insertion loss less than 1.0 dB by incorporating highly fluorinated polymers to reduce the absorption loss at 1550 nm. An attenuator-integrated low-crosstalk polymeric digital optical switch (DOS) is also demonstrated. The switch and attenuator shares a single connected electrode which is controlled by a single current source. Due to the simple structure of the integrated attenuator, the device length is reduced to 1 cm so as to provide low insertion loss of 0.8 and 1.1 dB for 1300 and 1550 nm, respectively. The attenuator radiates remained optical signal on the switch-off branch in order to decrease the switching crosstalk to be less than -70 dB with an applied electrical power of 200 mW.

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Near Infrared Laser Based on Polymer Waveguide Bragg Grating (폴리머 광도파로 브래그 격자 기반의 근적외선 레이저)

  • Kim, Kyung-Jo;Son, Nam-Seon;Kim, Jun-Whee;Oh, Min-Cheol
    • Korean Journal of Optics and Photonics
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    • v.22 no.4
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    • pp.179-183
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    • 2011
  • An external cavity laser operating at near infrared wavelength is demonstrated by incorporating polymer waveguide Bragg reflectors. 3rd order Bragg grating and oversized rip waveguide structure were designed by using the effective index method and the transmission matrix method. The polymer waveguide was fabricated using polymer materials with refractive indices of 1.462 and 1.435 for the core and the cladding layers, respectively. The external feedback laser with 875-nm Bragg grating exhibits single mode lasing located at 850-nm wavelength with an output power of 0 dBm, a 20-dB bandwidth of 0.2 nm and a side mode suppression ratio of 40 dB.

Low-Cost Fabrication of Multimode Optical Waveguides for Optical Interconnects (광 연결을 위한 저가형 멀티모드 광 도파로의 제작)

  • 이병탁;권민석;윤준보;신상영
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.315-318
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    • 1999
  • As low-cost optical waveguides of optical interconnects, we fabricate multimode optical waveguides using a molding process The core size of a optical waveguide is 47 ${\mu}{\textrm}{m}$ $\times$ 41 ${\mu}{\textrm}{m}$. We use the photoresist AZ9260 as a master, polydimethyl-siloxane (PDMS) as a mold. In transferring process to polymeric material, we employ a modified micro-transfer molding process. All processes are simple and low-cost.

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Implementation of Polymeric Thermo-optic Modulator using a New Vertical Asymmetric Optical Coupler (새로운 수직형 비대칭 광 결합구조를 이용한 폴리머 열광학 변조기 구현)

  • Lee, So-Yeong;Gwon, Jae-Yeong
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.37 no.5
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    • pp.39-48
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    • 2000
  • We newly proposed a polymer based vertical asymmetric optical coupler, which was characterized by simple fabricating procedure and short coupling length. And we fabricated a thermo-optic modulator using the polymeric optical coupler. We optimized the proposed device by coupling characteristic analysis. In a TE polarized 1.33${\mu}{\textrm}{m}$ wavelength, we obtained very short coupling length(L=277.6${\mu}{\textrm}{m}$) with 0.4${\mu}{\textrm}{m}$ thickness of middle layer, high coupling efficiency(94%), and asymmetric vertical waveguides with n$_{u}$ = 1.522, n$_{l}$ = 1.51. We implemented vortical asymmetric thermo-optic modulator with lower inverted rib waveguide and upper slab waveguide. In the 600Hz bandwidth and 4.5㎽ input power, the extinction ratio of the mode was 17㏈ with an insertion loss of 4.5㏈.

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