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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Optics and Photonics
Journal Basic Information
Journal DOI :
Optical Society of Korea
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Dec 2003
Volume 14, Issue 5 - Oct 2003
Volume 14, Issue 4 - Aug 2003
Volume 14, Issue 3 - Jun 2003
Volume 14, Issue 2 - Apr 2003
Volume 14, Issue 1 - Feb 2003
Selecting the target year
Fabrication of bifocal holographic lenses by holographic polymer dispersed liquid crystal film
Lee, Jung-Hoon ; Sung, Gee-Young ; Lee, Sang-Jo ; Kim, Ki-Hyun ; Joh, Young-Gul ; Kwak, Chong-Hoon ; Song, Jae-Bong ; Lee, Yun-Woo ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 109~115
DOI : 10.3807/KJOP.2003.14.2.109
We Have fabricated a holographic polymer-dispersed liquid crystal (HPDLC) thin film, which is composed of multifunctional acrylate monomer blended with the nematic liquid crystal mixture, and then investigated the real-time diffraction efficiencies for various amounts of liquid crystals and applied AC electric fields. It is experimentally shown that the holographic gratings recorded in the HPDLC film can be reversibly erased and reconstructed by switching on and off an appropriate applied AC electric field. By use of these electro-optic properties we have developed bifocal holographic lenses having two different focal lengths of 30cm and 40 cm.
Fourth-order interference between perpendicularly polarized beams with different intensities in a HOM interferometer
Kim, Heon-Oh ; Kim, Tae-Soo ; Ko, Jeon-Hoon ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 116~121
DOI : 10.3807/KJOP.2003.14.2.116
We have observed a nonclassical effect in a fourth-order interference experiment with the photon pairs produced by parametric down-conversion and the Hong-Ou-Handel interferometer. For interfering classical fields with orthogonal polarizations, the visibility can be no larger than 50%, and it depends on the ratio of the two beam intensities. It is found that not only is our observed visibility of 85％ well above 50％, but it is also independent of the two beam intensities in coincidence measurements made in a two-photon polarization correlation experiment.
Study on light extraction efficiency of a side-etched LED
Noh, Y.K. ; Kwon, K.Y. ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 122~129
DOI : 10.3807/KJOP.2003.14.2.122
In the case of a AIGalnP/GaP system rectangular parallelepiped high brightness LED which has side walls etched to be slanted off the vertical direction, we have studied the effects of lossy electrodes and material absorption and etching depth and angle of side walls on its light extraction efficiency. If LEDs have no electrodes, in order to obtain an 80％ light extraction efficiency of a TIP (truncated inverted pyramid) LED, the side-etched LEDs should have an etching angle of 22
and an etching depth of 8~17% of a dice height and an absorption coefficient less than 1
/ In case of etching depth of 16~39% of a dice height, we can obtain a 90% light extraction efficiency of a TIP LED. But when LEDs have two electrodes and no absorption loss, in order to obtain an 80％ light extraction efficiency of a TIP LEBs, the side-etched LEDs should have an etching angle of 25
and an etching depth of 30～36% of a dice height. In case of etching depth of 57~71％ of a dice height, we can obtain a 90％ light extraction efficiency of a TIP LED.
Hanbury brown-Twiss effect in a two-photon interference experiment
Kim, Heon-Oh ; Ko, Jeong-Hoon ; Park, Goo-Dong ; Kim, Tae-Soo ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 130~134
DOI : 10.3807/KJOP.2003.14.2.130
We present experimental observations of two-photon spatial bunching effect in a two-photon interference experiment by using the photon pairs produced by parametric down-conversion and the Hong-Ou-Mandel interferometer. We show that this pairing behavior is observed by coincidence detection, but gives a negligible effect for a single count.
Design and fabrication of temperature-independent AWG-WDM devices using polymer overcladding
Han, Young-Tak ; Kim, Duk-Jun ; Shin, Jang-Uk ; Park, Sang-Ho ; Park, Yoon-Jung ; Sung, Hee-Kyeng ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 135~141
DOI : 10.3807/KJOP.2003.14.2.135
In arrayed waveguide grating (AWG) devices whose waveguides were composed of polymer with negative thermo-optic coefficient as overcladding, and silica with positive thermo-optic coefficient as both core and undercladding, we investigated the temperature dependence of the central wavelength using two-dimensional SFDM. From these results, it was confirmed that the temperature dependence can be nearly eliminated by adjusting the refractive index of the cladding and the thickness of the silica thin film upper-loaded on the core. Based on the numerical calculations, the AWG device with polymer overcladding was fabricated. and its optical characteristics were compared with those of the orginal silica AWG device. The introduction of polymer overcladding decreased the temperature dependence of the central wavelength from 0.0130 nm/
to 0.0028 nm/
without deteriorating the insertion loss and crosstalk characteristics.
Investigation of a nonreciprocal phase shift properties of optical waveguide isolators with a magneto-optic layer
Yang, Jeong-Su ; Kim, Young-Il ; Byun, Young-Tae ; Woo, Deok-Ha ; Lee, Seok ; Kim, Sun-Ho ; Yi, Jong-Chang ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 142~145
DOI : 10.3807/KJOP.2003.14.2.142
The nonreciprocal phase shift characteristics of infinite slab optical waveguides with magneto-optic materials in the cladding layer was calculated at 1.55
for optical isolators. The infinite slab waveguide structures considered in this paper were as follows. rho magneto-optic materials used as a cladding layer were Ce:YIG and LNB(LuNdBi)
,). Their specific Faraday rotations Θ
/cm at wavelength 1.55
respectively. The guiding layer with multi-quantum well structure was used, and it consists of 1.3Q and InGaAs. In order to investigate the effect of evanescent field penetrating the cadding, layer, guiding mode characteristics were calculated for the cases when the substrate is InP and air. We calculated the minimum lengths of 90
nonreciprocal phase shifters and their optimum guiding layer thicknesses in various optical waveguide structures.res.s.
Efficient pulse amplification in a two-stage EDEA with a bandpass filter
Kim, Byung-Jun ; Lee, Han-Hyub ; Choi, Hyun-Beom ; Lee, Dong-Han ; Kim, Dae-Yun ; Kwon, Il-Bum ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 146~149
DOI : 10.3807/KJOP.2003.14.2.146
Nanosecond pulses are efficiently amplified by a two-stage EDFA. The EDFA employs an optical bandpass filter between stages to remove the amplified spontaneous emission of the first EDFA that strongly saturates the gain of the second EDFA. The peak power of the amplified output pulse is 83 W when that of the input pulse of 10 ㎱width and 100
period is 1 ㎽.
Modified parity coding for digital holographic data storage system with spatial beam intensity variations
Choi, An-Sik ; Jun, Young-Sik ; Baek, Woon-Sik ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 150~154
DOI : 10.3807/KJOP.2003.14.2.150
In this paper, we introduce modified parity coding methods to reduce the errors caused by spatial beam intensity variations in a holographic data storage system. We explained the encoding and decoding process of the conventional parity coding and the modified parity coding techniques. We compared the bit-error-rate (BER) performances of the conventional parity coding and the modified parity coding techniques from experimental evaluation.
Noise characteristics of a depolarized fiber-optic gyroscope incorporating single-mode fiber
Jin, Young-Jun ; Park, Tae-Yong ; Park, Hee-Gap ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 155~160
DOI : 10.3807/KJOP.2003.14.2.155
We have constructed and characterized a depolarized fiber-optic gyroscope that uses a length of single-mode fiber as a sensing loop fiber. We have also calculated the noise characteristics of the gyroscope and have found an optimum phase modulation depth that gives the highest signal-to-noise ratio in the gyroscope. The random walk coefficient as small as 0.7
deg/√hr was obtained at the modulation depth of around 2.4 rad. The random walk coefficients measured at various modulation depths were found to be in reasonable agreement with the calculation.
Optical 60 GHz signal generation using side-band injection-locking of semiconductor lasers
Ryu, Hye-Seung ; Seo, Young-Kwang ; Choi, Woo-Young ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 161~165
DOI : 10.3807/KJOP.2003.14.2.161
Optical 60 ㎓ millimeter-wave (MMW) signal generation is demonstrated using the sideband injection-locking method in the master/slave configuration, where two slave lasers are locked to two among several side-bands produced by the direct rf-modulation of a master laser. These two locked slave laser outputs beat against each other in the photo-detector and produce stable and very pure 60 ㎓ signals.
10 Gb/s all optical AND gate by using semiconductor optical amplifiers
Kim, Jae-Hun ; Kim, Byung-Chae ; Byun, Young-Tae ; Jhon, Young-Min ; Lee, Seok ; Woo, Deok-Ha ; Kim, Sun-Ho ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 166~168
DOI : 10.3807/KJOP.2003.14.2.166
By using gain saturation of semiconductor optical amplifiers (SOAs), an all-optical AND gate at 10 Gb/s has been successfully demonstrated. Firstly, Boolean (equation omitted) has been obtained using the first SOA with signal B and clock injection. Then, the all-optical AND gate is achieved using the second SOA with signals A and (equation omitted) injection.
Design and fabrication of the surface plasmon fiber polarizer
Lee, Jun-Ock ; Kim, Cheol-Ho ; Kim, Kwang-Taek ; Kwon, Kwang-Hee ; Song, Jae-Won ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 169~174
DOI : 10.3807/KJOP.2003.14.2.169
We report theoretical and experimental investigation of a polarizer made of single mode side-polished fiber covered with a metal film. The influence of the metal film thickness and the refractive index of overlay on the device performance has been analyzed in terms of the normal mode theory. Based on the theoretical prediction, a polarizer with 40 ㏈ of polarization extinction ratio and 0.5 ㏈ insertion loss at optical communication wavelength has been realized
Nonlinear interferometric optical parametric amplifier
Lee, Sang-Yong ; Kim, Jae-Kwan ; Jeong, Je-Myung ; Chang, Ho-Sung ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 175~183
DOI : 10.3807/KJOP.2003.14.2.175
We obtain a solution of optical parametric amplification using self-phase modulation within the Kerr media in a nonlinear interferometer with two arms. We show that it is equivalent to the solution driven by four-wave mixing and that the solution of parametric amplification is suitable to generate a parametric gain. We obtain a derivative of power gain with respect to the propagation distance and show that gain-saturation can occur as the beam propagates along the nonlinear arms. We also show a bandwidth characteristic of the parametric amplification driven by nondegenerate four-wave mixing. Numerical examples are given to illustrate that the solution of the parametric amplification can be applied to design and analysis of all-optical devices such as all-optical amplifiers.
Fabrication and Modulation Characteristic of TE-selective P-I-i-I-N GaAs/Al
As waveguide phase modulator
Kim, Sun-Pil ; Lee, Sang-Sun ; Lee, Seok ; Woo, Deok-Ha ; Kim, Sun-Ho ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 184~188
DOI : 10.3807/KJOP.2003.14.2.184
We fabricated a P-I-i-I-N
waveguide phase modulator with significant phase shift for the TE mode but negligible for the TM mode. We selected the P-I-i-I-N structure to cause a phase shift about the TM mode. The wavelength of $\lambda
Improvement of extinction ratio of amplified pulses by incorporating a nonlinear optical loop mirror
Kim, Byung-Jun ; Choi, Hyun-Beom ; Lee, Han-Hyub ; Lee, Dong-Han ; Kim, Dae-Yun ; Kwon, Il-Bum ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 189~193
DOI : 10.3807/KJOP.2003.14.2.189
A two-stage erbium-doped fiber amplifier (EDFA) with a band pass filter is used to get optical pulses of high peak value. The pulse signal has a 32 ㏈ extinction ratio, 125 W peak power and 79 ㎽ pulse off power. A nonlinear optical loop mirror (NOLM) is used to lower the pulse off power so as to increase the extinction ratio. The pulse signal after the NOLM has a 50.4 ㏈ extinction ratio, 35 W peak power and 0.3 ㎽ pulse off power.
Electro-optical analysis of a miniaturized electrostatic electron lens
Kim, Ho-Seob ; Kim, Dae-Wook ; Kim, Young-Chul ; Choi, Sang-Kuk ; Kim, Dae-Yong ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 194~199
DOI : 10.3807/KJOP.2003.14.2.194
The analysis of operation characteristics of a miniaturized electrostatic electron lens system called an Einzel lens was performed using a simulation tool of FCM method. The potential distributions of Einzel lenses operated both in retarding and accelerating modes show similar features. But the electric fields determined from the potential distributions show opposite directions, which results in different features in the electron beam trajectory in each mode of operation. For the same working distance, focusing voltage in the accelerating mode is higher than that in the retarding mode.
Three-dimensional relative-distance measurement by use of the phase-shifting digital holography
Kim, Hyun ; Lee, Yeon-H. ;
Korean Journal of Optics and Photonics, volume 14, issue 2, 2003, Pages 200~207
DOI : 10.3807/KJOP.2003.14.2.200
In this paper we present a new method of measuring the relative distance of two point objects in three-dimensional space by using phase-shifting digital holography. In our system the reference beam of a spherical wave is used instead of a plane wave. The system is computer simulated and built on an optical table for experiments. It is shown from computer simulations and experiments that the relative distance can be measured without the exact information on the reference beam used in the hologram record. It is shown from experiments that the relative distance between two point objects separated by 0.5 cm in the distance of about 300 cm from the CCD can be measured with an error less than 10％.