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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>
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>
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>
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>
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>
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>
Visible-to-infrared down-conversion in the silicon nanoparticles-doped optical fiber
Watekar, P.R.,Ju, S.,Han, W.T. Elsevier 2009 Current Applied Physics Vol.9 No.3
An optical fiber doped with silicon nanoparticles was developed using the modified chemical deposition method. The optical fiber showed the absorption band peaking at about 750nm. Upon pumping with the He-Ne laser at 632nm, the fiber showed near infrared emission in a band around 850nm. An overlapping of absorption and emission bands suggests that a phenomenon of silicon nanoparticles interface defects dominated in the visible-to-infrared down-conversion.
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>