Search Results - "Kim, Hyang Kyun"

Reduced Thermal Sensitivity of a Fiber-Optic Gyroscope Using an Air-Core Photonic-Bandgap Fiber by Blin, S., Hyang Kyun Kim, Digonnet, M.J.F., Kino, G.S.

“…A 6.5-fold reduction in thermal sensitivity is demonstrated experimentally in a fiber-optic gyroscope made of a 235-m length of quadrupolar-wound air-core…”
Get full text

Air-core photonic-bandgap fiber-optic gyroscope by Hyang Kyun Kim, Digonnet, M.J.F., Kino, G.S.

“…We report the demonstration of the first air-core photonic-bandgap fiber gyroscope. Because the optical mode in the sensing coil travels largely through air,…”
Get full text

Measurements of the Birefringence and Verdet Constant in an Air-Core Fiber by He Wen, Terrel, M.A., Hyang Kyun Kim, Digonnet, M., Shanhui Fan

“…In order to determine the Verdet constant of an air-core photonic bandgap fiber (PBF), the birefringence of the fiber needs to be accurately known. We used two…”
Get full text

Understanding air-core photonic-bandgap fibers: analogy to conventional fibers by Digonnet, M.J.F., Hyang Kyun Kim, Kino, G.S., Shanhui Fan

“…It is shown from basic principles that the core modes of an air-core photonic-bandgap fiber (PBF) exhibit similar qualitative and quantitative behavior as the…”
Get full text

Dynamic erbium-doped fiber amplifier based on active gain flattening with fiber acoustooptic tunable filters by Hyun Yun, Seok, Wan Lee, Bong, Kyun Kim, Hyang, Yoon Kim, Byoung

“…We describe the first demonstration of a dynamic erbium-doped fiber amplifier (EDFA) based on automatic feedback control of active gain equalizing filters. The…”
Get full text

Actively gain-flattened erbium-doped fiber amplifier over 35 nm by using all-fiber acoustooptic tunable filters by Kim, Hyo Sang, Yun, Seok Hyun, Kim, Hyang Kyun, Park, Namkyoo, Kim, Byoung Yoon

“…We demonstrate an actively gain-flattened erbium-doped fiber amplifier (EDFA) using an all-fiber gain-flattening filter with electronically controllable…”
Get full text

Designing air-core photonic-bandgap fibers free of surface modes by Hyang Kyun Kim, Jonghwa Shin, Shanhui Fan, Digonnet, M.J.F., Kino, G.S.

“…It is known that the coupling of core modes to surface modes in air-core photonic-bandgap fiber (PBF) can give rise to large propagation losses. Using computer…”
Get full text

Dynamic gain and output power control in a gain-flattened erbium-doped fiber amplifier by Park, Seo Yeon, Kim, Hyang Kyun, Lyu, Gap Yeol, Kang, Sun Mo, Shin, Sang-Yung

“…We demonstrate an erbium-doped fiber amplifier (EDFA) that has a flat-gain spectrum over an 18-nm band and a constant per-channel output power regardless of…”
Get full text

Phase sensitivity to temperature of the fundamental mode in air-guiding photonic-bandgap fibers by Dangui, Vinayak, Kim, Hyang, Digonnet, Michel, Kino, Gordon

“…Because in an air-core photonic-bandgap fiber the fundamental mode travels mostly in air, as opposed to silica in a conventional fiber, the phase of this mode…”
Get full text

Transmission of directly modulated 2.5-Gb/s signals over 250-km of nondispersion-shifted fiber by using a spectral filtering method by Lee, Chang-Hee, Lee, Sang-Soo, Kim, Hyang Kyun, Han, Jung-Hee

“…We demonstrate 250-km nondispersion-shifted fiber transmission of directly modulated 2.5-Gb/s signals. The chirping-induced power penalty is reduced by using a…”
Get full text

Dynamic Gain Equalized Hybrid Optical Amplifier Composed of Erbium Doped Fiber Amplifier and Semiconductor Optical Amplifier by Cho, Ho Sung, Lee, Dong Ho, Kim, Hyang Kyun, Lee, Sang Soo

“…We propose a new hybrid optical amplifier utilizing two-stage configuration with a silica-based Erbium doped fiber amplifier (EDFA) and a semiconductor optical…”
Get full text

Influence of the span loss variation in cascaded EDFA's on the receiver dynamic range in WDM systems by Kim, Hyang Kyun, Park, Seo Yeon, Lee, Young Goo, Lee, Dong Ho, Park, Chang Soo

“…Influences of the gain or the span loss variations in cascaded EDFAs on the receiver dynamic range are investigated for WDM systems and compared the results…”
Get full text

A Single Etch-Step Fabrication-Tolerant Polarization Splitter by Augustin, L.M., van der Tol, J.J.G.M., Hanfoug, R., de Laat, W.J.M., van de Moosdijk, M.J.E., van Dijk, P.W.L., Yok-Siang Oei, Smit, M.K.

“…A tolerant single etch-step passive polarization splitter on InP/InGaAsP is designed and fabricated. The device consists of a directional coupler with a wide…”
Get full text

Simple geometric criterion to predict the existence of surface modes in air-core photonic-bandgap fibers by Digonnet, Michel, Kim, Hyang, Shin, Jonghwa, Fan, Shanhui, Kino, Gordon

“…We propose a simple geometric criterion based on the size of the core relative to the photonic crystal to quickly determine whether an air-core…”
Get full text

Simulations of the effect of the core ring on surface and air-core modes in photonic bandgap fibers by Kim, Hyang Kyun, Digonnet, Michel, Kino, Gordon, Shin, Jonghwa, Fan, Shanhui

“…We show through computer simulations that the thin silica ring that surrounds the air core of a photonic-bandgap fiber introduces surface modes. The intensity…”
Get full text

Dynamic erbium-doped fiber amplifier with automatic gain flattening by Seok Hyun Yun, Bong Wan Lee, Hyang Kyun Kim, Byoung Yoon Kim

“…We demonstrate, for the first time to our knowledge, a dynamic EDFA based on automatic active gain flattening. Wide-dynamic-range gain/power control is…”
Get full text

Efficient and low-noise operation in a gain-flattened 1580 nm band EDFA by Seo Yeon Park, Hyang Kyun Kim

“…The power conversion efficiency of 35% and the noise figure of 5.1 dB are obtained in the 1580-nm band erbium-doped fiber amplifier (EDFA) composed of the…”
Get full text

Surface-mode behavior of air-core photonic-bandgap fibers by Hyang Kyun Kim, Jonghwa Shin, Shanhui Fan, Digonnet, M.J.F., Kino, G.S.

“…The relation between core size and surface modes in photonic-bandgap fibers is analyzed through numerical simulations. We present a simple criterion to predict…”
Get full text

Simplification of the EDFA gain spectra utilizing gain slope compensating filter by Hyang Kyun Kim, Seo Yeon Park, Kim, T.H., Lee, D.H.

“…We propose the use of gain slope compensating filter to simplify the EDFA gain spectra. The proposed gain slope compensating filter (GSCF) exhibits the loss…”
Get full text

Dynamic gain-controlled EDFA for WDM network by Seo Yeon Park, Hyang Kyun Kim, Dong Ho Lee, Sang-Yung Shin

“…Summary form only given. We demonstrate a dynamic gain-controlled Er-doped fibre amplifier (EDFA) that controls pump power with a response time of 650 ns. In…”
Get full text