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Integrated-Optic Polarization Controlling Devices Using Electro-Optic Polymers
Oh, Min-Cheol,Hwang, Wol-Yon,Kim, Jang-Joo Electronics and Telecommunications Research Instit 1997 ETRI Journal Vol.18 No.4
Integrated-optic polarization controlling devices such as polarizers, polarization splitters, and polarization converters, are proposed and demonstrated in nonlinear optic polymers. Poling-induced birefringence in electro-optic polymers is exploited to fabricate the devices. The polymeric waveguide polarizers show low excess losses, and extinction ratios of 20.7 dB and 17.1 dB for TM-pass and TE-pass polarizers, respectively. The polymeric waveguide polarization splitters exhibit TE-TM mode splittings with crosstalk of 14.2 dB and 10.1 dB for TM and TE mode splittings, respectively. The polymeric waveguide polarization converters show successful TE/TM polarization mode conversion with conversion efficiencies of higher than 30 dB. The device employs poling-induced waveguides which have slowly rotating azimuth angle of optic axis along the light propagation direction. The novel polarization converter is insensitive to wavelength and easier to fabricate than the other polarization converters containing periodic structures.
Molecular Conformation and Application of Stereoregular PMMA Langmuir-Blodgett Films
Kim, Jang-Joo,Jung, Sang-Don,Hwang, Wol-Yon Electronics and Telecommunications Research Instit 1996 ETRI Journal Vol.18 No.3
Molecular conformations of stereoregular poly(methyl methacrylate) (PMMA) monolayers have been investigated by scanning probe microscopes. Isotactic and syndiotactic PMMAs were found to have right and left hand helical structures, respectively. On the contrary atactic PMMA showed rather random arrangement of the chains. It has been demonstrated that the PMMA Langmuir-Blodgett (LB) films can be utilized to form nanoscale patterns down to 50 nm and to forma geodesic lens. It has also been manifested that the quantum efficiency of a polymer electroluminescent device can be significantly enhanced by inserting the PMMA LB films between the emitting layer and the cathode. All the applications utilize the unique characteristics of the LB films to form thin and uniform films in the molecular level.
Photobleaching for the Formation of Nonlinear Optical Polymer Waveguide Devices
Kim, Jang Joo,Zyung, Taehyoung,Hwang, Wol Yon,Oh, Min Cheol 한국화학공학회 1996 NICE Vol.14 No.3
A simple but realistic kinetic model has been developed to delineate the refractive index profiles formed by photochemical reaction in nonlinear optical polymers. The effects of the absorption due to the unconverted reactant and the photoproduct are included in the model. The parameters required in the model are obtained from simple transmission experiments. The experimental results are consistent with the model. The refractive index profile is steeper when nonlinear optical polymeric materials are bleached by light with higher absorption. The rate of the bleach depth change becomes slower cs the bleaching proceeds. Small absorption of bleaching light due to the photoproduct has significant effect on the resulting refractive index profiles. The photobleaching process is showen to be accelerated by the addition of a photosensitizer. Photobleaching time has been effectively reduced by a factor of 3--5. Linear and nonlinea.r optical properties of the polymer were little affected try the addition of the photosensitizer. It has also been demonstrated that the photobleaching technique can be utilized to tune the initial state of a directional coupler switch after completing the fabrication of the device. It was shown that successive cross states are passed from the initial cross state by selective bleaching of the gap region. The evolution of the refractive index profiles is successfully applied to predict the evolution of output state.
PHOTOBLEACHING FOR THE FORMATION OF NONLINEAR OPTICAL POLYMER WAVEGUIDE DEVICES
Kim, Jang Joo,Zyung, Taehyoung,Hwang, Wol Yon,Oh, Min Cheol 한국화학공학회 1996 Korean Journal of Chemical Engineering Vol.13 No.2
A simple but realistic kinetic model has been developed to delineate the refractive index profiles formed by photochemical reaction in nonlinear optical polymers. The effects of the absorption due to the unconverted reactant and the photoproduct are included in the model. The parameters required in the model are obtained from simple transmission experiments. The experimental results are consistent with the model. The refractive index profile is steeper when nonlinear optical polymeric materials are bleached by light with higher absorption. The rate of the bleach depth change becomes slower as the bleaching proceeds. Small absorption of bleaching light due to the photoproduct has significant effect on the resulting refractive index profiles. The photobleaching process is shown to be accelerated by the addition of a photosensitizer. Photobleaching time has been effectively reduced by a factor of 3-5. Linear and nonlinear optical properties of the polymer were little affected by the addition of the photosensitizer. It has also been demonstrated that the photobleaching technique can be utilized to tune the initial state of a directional coupler switch after completing the fabrication of the device. It was shown that successive cross states are passed from the initial cross state by selective bleaching of the gap region. The evolution of the refractive index profiles is successfully applied to predict the evolution of output state.
A PLC-Based Optical Sub-assembly of Triplexer Using TFF-Attached WDM and PD Carriers
한영탁,Yoon-Jung Park,Sang-Ho Park,신장욱,김덕준,Chul-Hee Park,Sung-Woong Park,권윤구,Deug-Ju Lee,Wol-Yon Hwang,Hee-Kyung Sung 한국전자통신연구원 2006 ETRI Journal Vol.28 No.1
We have fabricated a planar lightwave circuit (PLC) hybrid-integrated optical sub-assembly of a triplexer using a thin film filter (TFF)-attached wavelength division multiplexer (WDM) and photodiode (PD) carriers. Two types of TFFs were attached to a diced side of a silica-terraced PLC platform, and the PD carriers with a 45° mirror on which pin- PDs were bonded were assembled with the platform. A clear transmitter eye-pattern and minimum receiver sensitivity of -24.5 dBm were obtained under 1.25 Gb/s operation for digital applications, and a second-order inter-modulation distortion (IMD2) of -70 dBc was achieved for an analog receiver.