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Near zero bending loss in a double-trenched bend insensitive optical fiber at 1550 nm
Watekar, Pramod R.,Ju, Seongmin,Han, Won-Taek The Optical Society 2009 Optics express Vol.17 No.22
<P>We have developed a new single-mode optical fiber (SMF) which exhibits ultra low bend sensitivity over a wide communication band. The measured mean bending loss at 1550 nm was about 0.0095 dB for a loop of 10 mm diameter.</P>
Design of Nonzero Dispersion Flattened Fiber Amplifier Optimized for S-Band Optical Communication
Watekar, P.R.,Han, W.-T. IEEE 2009 Journal of Lightwave Technology Vol.27 No.9
<P>We present a new design of dispersion flattened optical fiber for flat nonzero dispersion in the S-band region. The optimized parameters of optical fiber are used to find the optimum concentration of Tm-ions in Tm-doped optical fiber, which is further analyzed for the gain and noise performance. It is found that about 5000 mW of pumping power at 1.064 <I>mum</I> is required to obtain 15 dB gain at 1.47 <I>mum</I> in the silica glass Tm-doped (dispersion flattened) optical fiber.</P>
Linear and Nonlinear Optical Properties of Si Nanoparticles/ Er-Ions Doped Optical Fiber
Watekar, P.R.,Songbae Moon,Aoxiang Lin,Seongmin Ju,Won-Taek Han IEEE 2009 Journal of Lightwave Technology Vol.27 No.5
<P>An alumino-germano-silica glass fiber doped with silicon nanoparticles and erbium ions was fabricated using the modified chemical vapor deposition (MCVD) method. Optical properties of the glass fiber were investigated using a Judd-Ofelt analysis. It was found that incorporating silicon nanoparticles with erbium ions did not alter Er-related optical properties of the silica glass fiber. The incorporation of silicon particles in a fiber core caused wide band absorption from 480 nm to 1200 nm. A third order optical nonlinearity of the Si-Er-doped alumino-germano-silica glass fiber was measured to be about 3.8 x 10<SUP>-15</SUP> m<SUP>2</SUP>/W.</P>
Bend insensitive optical fiber with ultralow bending loss in the visible wavelength band.
Watekar, Pramod R,Ju, Seongmin,Han, Won-Taek Optical Society of America 2009 Optics letters Vol.34 No.24
<P>We report experimental development of a single-mode optical fiber optimized for a wavelength band of 400 nm to 700 nm, which showed negligible bending loss of 0.09 dB/loop at 400 nm and 0.23 dB/loop at 633 nm for a loop diameter of 10 mm.</P>
Watekar, Pramod R,Kim, Deog Hyeon,Yang, Hoyoung,Han, Won-Taek,Ju, Seongmin Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P>The magneto-optic properties of specialty optical fibers doped with CdSe quantum dots (QDs) and Eu<SUP>2+</SUP> ions were investigated. These fibers showed enhanced magnetic sensitivity at 633 nm; in particular, the Verdet constant of the CdSe QDs doped optical fiber was found to be 3.81 rad T<SUP>−1</SUP> m<SUP>−1</SUP>, while that of Eu<SUP>2+</SUP> ion-doped fiber was 2.6 rad T<SUP>−1</SUP> m<SUP>−1</SUP>.</P>
Design and development of a trenched optical fiber with ultra-low bending loss
Watekar, Pramod R.,Ju, Seongmin,Han, Won-Taek The Optical Society 2009 Optics express Vol.17 No.12
<P>We have designed and experimentally demonstrated a single mode optical fiber with a very low bending loss of about 0.014 dB/loop at 1550 nm for a bending radius of 5 mm.</P>
A Small-Signal Power Model for Tm-Doped Silica-Glass Optical Fiber Amplifier
Watekar, P.R.,Ju, S.,Han, W.-T. IEEE 2006 IEEE photonics technology letters Vol.18 No.19
<P>We propose and demonstrate experimentally a small-signal and small-gain regime model to analyze Tm-doped silica-glass optical fiber for amplifier application.</P>
Watekar, P.R.,Ju, S.,Han, W.T. North-Holland 2008 Journal of non-crystalline solids Vol.354 No.2
We propose a new method to measure the non-resonant third-order optical non-linearity of germano-silicate glass fiber having arbitrary GeO<SUB>2</SUB> concentration profile using wavelength dependence of mode field diameter. The measured non-linear refractive indices of Samsung's single mode fiber and the Sumitomo's highly non-linear optical fiber were found to be in good agreement with the published results within 3.2% and 3.1% error, respectively. The method is applicable only for the optical fibers whose dispersion is dominated by the material dispersion.
A simple and reliable method to determine LP_11 cutoff wavelength of bend insensitive fiber
Watekar, Pramod R.,Ju, Seongmin,Htein, Lin,Han, Won-Taek The Optical Society 2010 Optics express Vol.18 No.13
<P>We present a simple and reliable method based on the spectral splice loss measurement to determine the cutoff wavelength of bend insensitive fiber.</P>
Enhanced current sensitivity in the optical fiber doped with CdSe quantum dots
Watekar, Pramod R.,Yang, Hoyoung,Ju, Seongmin,Han, Won-Taek The Optical Society 2009 Optics express Vol.17 No.5
<P>A new optical fiber current sensor using a CdSe quantum dots doped optical fiber has been demonstrated with high Faraday rotation for remote sensing of current from 0 to 40 Amperes. It showed enhancement in the current sensitivity by about 2 times than that of the single mode optical fiber current sensor at 632 nm.</P>