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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>
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>
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>
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>
All-optical Switch Based on the Optical Fiber Doped with PbSe Quantum-dots
Pramod R. Watekar,Seongmin Ju,Won?Taek Han 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
We demonstrated all-optical fiber ON/OFF switch based on the nonlinear optical fiber doped with PbSe nanoparticles. The switching speed was found to be 170 ㎰ upon pumping at 1064 ㎚.
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>
Development of a highly sensitive compact sized optical fiber current sensor
Watekar, Pramod R.,Ju, Seongmin,Kim, Su-Ah,Jeong, Seongmook,Kim, Youngwoong,Han, Won-Taek The Optical Society 2010 Optics express Vol.18 No.16
<P>We have experimentally developed a highly sensitive and a compact size current sensor by using the CdSe quantum dots-doped bend insensitive optical fiber, operating in the visible band of wavelength. The modified sensitivity of this sensor was about 675 murad/(Turn.A.m) for the loop radius of just 10 mm, which is more than 16 times larger than that of the single mode optical fiber current sensor.</P>