The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform
Namkyoo Park - One of the best experts on this subject based on the ideXlab platform.
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dynamic edfa Gain Flattening Filter using two lpfgs with divided coil heaters
IEEE Photonics Technology Letters, 2005Co-Authors: Jun Kye Bae, Namkyoo Park, Jinho Bae, Sang Hyuck Kim, Sang Bae LeeAbstract:We introduce a new type of dynamic erbium-doped fiber amplifier (EDFA) Gain-Flattening Filter using two long-period fiber gratings (LPFGs) equipped with divided coil heaters. By individually controlling each of the 64 segments of coil heaters over the grating, we adjusted the temperature distribution of LPFGs piecewise-uniformly, thus, to maintain optimum Gain-flatness for different EDFA operation conditions. By controlling the different cladding modes for each LPFGs, we also achieve enhanced controllability/flexibility for the Filter spectrum of dynamic LPFG. Wide dynamic-range Gain/power control with less than 0.8-dB signal ripples, over 30 nm was demonstrated.
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actively Gain flattened erbium doped fiber amplifier over 35 nm by using all fiber acoustooptic tunable Filters
IEEE Photonics Technology Letters, 1998Co-Authors: Hyo Sang Kim, Namkyoo Park, Seok Hyun Yun, Hyang Kyun Kim, Byoung Yoon KimAbstract:We demonstrate an actively Gain-flattened erbium-doped fiber amplifier (EDFA) using an all-fiber Gain-Flattening Filter with electronically controllable spectral profiles. A good Gain flatness ( 35 nm) is achieved for a wide range of operational Gain levels as well as input signal and pump powers.
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Low-loss all-fiber acousto-optic tunable Filter
1997Co-Authors: Hyo Sang Kim, Namkyoo Park, Seok Hyun Yun, Hyang Kyun Kim, Byoung Yoon KimAbstract:Abstract—We demonstrate an actively Gain-flattened erbium-doped fiber amplifier (EDFA) using an all-fiber Gain-Flattening Filter with electronically controllable spectral profiles. A good Gain flatness (<0.7 dB) over a broad wavelength span (>35 nm) is achieved for a wide range of operational Gain levels as well as input signal and pump powers. Index Terms—Erbium materials/devices, optical fiber ampli-fiers, optical fiber communication, optical fiber Filters, tunable Filters, wavelength-division multiplexing. CONSIDERABLE efforts have been devoted to the re-alization of Gain-flattened erbium-doped fiber ampli-fiers (EDFA’s) over a wide spectral range for large-capacity wavelength-division-multiplexed (WDM), optical communica-tion systems. As a result, the usable Gain bandwidth of EDFA’s has been increased significantly over the past few years with the help of new glass compositions [1] and/or Gain flattenin
H Suganurna - One of the best experts on this subject based on the ideXlab platform.
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Gain Flattening Filter using long period fiber gratings
Journal of Lightwave Technology, 2002Co-Authors: M Harurnoto, M Shigehara, H SuganurnaAbstract:We propose a novel structure for a Gain-Flattening Filter, in which a conventional long-period fiber grating (LPFG) and a phase-shifted LPFG are written closely. The transmission characteristics are investigated in the case of a closely arranged configuration. For the fabrication of a phase-shifted LPFG, a UV-trimming method to control the amount of the phase shift is examined theoretically and experimentally. Finally, a 67-mm-long LPFG Gain-Flattening Filter designed for an erbium-doped fiber amplifier is fabricated and the measured spectrum is shown.
Byoung Yoon Kim - One of the best experts on this subject based on the ideXlab platform.
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actively Gain flattened erbium doped fiber amplifier over 35 nm by using all fiber acoustooptic tunable Filters
IEEE Photonics Technology Letters, 1998Co-Authors: Hyo Sang Kim, Namkyoo Park, Seok Hyun Yun, Hyang Kyun Kim, Byoung Yoon KimAbstract:We demonstrate an actively Gain-flattened erbium-doped fiber amplifier (EDFA) using an all-fiber Gain-Flattening Filter with electronically controllable spectral profiles. A good Gain flatness ( 35 nm) is achieved for a wide range of operational Gain levels as well as input signal and pump powers.
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Low-loss all-fiber acousto-optic tunable Filter
1997Co-Authors: Hyo Sang Kim, Namkyoo Park, Seok Hyun Yun, Hyang Kyun Kim, Byoung Yoon KimAbstract:Abstract—We demonstrate an actively Gain-flattened erbium-doped fiber amplifier (EDFA) using an all-fiber Gain-Flattening Filter with electronically controllable spectral profiles. A good Gain flatness (<0.7 dB) over a broad wavelength span (>35 nm) is achieved for a wide range of operational Gain levels as well as input signal and pump powers. Index Terms—Erbium materials/devices, optical fiber ampli-fiers, optical fiber communication, optical fiber Filters, tunable Filters, wavelength-division multiplexing. CONSIDERABLE efforts have been devoted to the re-alization of Gain-flattened erbium-doped fiber ampli-fiers (EDFA’s) over a wide spectral range for large-capacity wavelength-division-multiplexed (WDM), optical communica-tion systems. As a result, the usable Gain bandwidth of EDFA’s has been increased significantly over the past few years with the help of new glass compositions [1] and/or Gain flattenin
Zhangyuan Chen - One of the best experts on this subject based on the ideXlab platform.
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few mode Gain Flattening Filter using lpfg in weakly coupled double cladding fmf
Journal of Lightwave Technology, 2021Co-Authors: Jinglong Zhu, Yu Yang, Mingqing Zuo, Zhangyuan ChenAbstract:Recently, few-mode Erbium-doped fiber amplifiers (FM-EDFA) for mode-division multiplexing (MDM) transmission have attracted much interest. In this paper, we propose a novel few-mode Gain-Flattening Filter (FM-GFF) based on long-period fiber gratings (LPFG) in double-cladding few-mode fiber (DC-FMF). Due to weak coupling among all the core modes and limited number of inner-cladding modes, the phase matching condition for a specific FM-LPFG can be satisfied only between one core mode and one inner-cladding mode each time and independent Gain Flattening can be realized for each core mode without influencing the other ones. Moreover, both DC-FMF and transmission FMF have the same core refractive index and radius, while the inner-cladding of DC-FMF and the cladding of transmission FMF have the same refractive index, which can effectively maintain the weakly-coupled condition for their connections. We show by simulation that the output Gain spectra for all the 4 or 6 linearly-polarized (LP) core modes in two kinds of DC-FMFs can be independently flattened to less than 0.6-dB in the whole C-band by the cascading LPFGs in the DC-FMF. The proposed FM-GFF scheme is beneficial for the practical design of FM-EDFAs.
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weakly coupled few mode Gain Flattening Filter using long period fiber grating in double cladding fmf
Optical Fiber Communication Conference, 2020Co-Authors: Jinglong Zhu, Yu Yang, Junchi Jia, Zhangyuan ChenAbstract:A weakly-coupled few-mode Gain-Flattening Filter (FM-GFF) based on long-period fiber gratings (LPFGs) in double-cladding few-mode fiber is proposed. Utilizing the FM-GFF, we demonstrate that the Gain spectra of each core mode can be independently flattened.
Vipul Rastogi - One of the best experts on this subject based on the ideXlab platform.
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Design and study of trench-assisted long-period-waveguide-grating based Gain Flattening Filter for erbium-doped waveguide amplifier
Journal of Optics, 2016Co-Authors: Nandam Ashok, Vipul RastogiAbstract:We propose a trench assisted long-period-waveguide-grating (LPWG) design for Flattening the Gain spectrum of erbium doped waveguide amplifier. The waveguide structure consists of a low index trench in the cladding region. The modes of the waveguide structure have been evaluated by the transfer matrix method and transmission characteristics of the long period grating have been simulated by using the coupled mode theory. The transmission spectrum of the long period waveguide grating has been utilized to equalize the Gain spectrum of erbium doped waveguide amplifier in the desired wavelength range. Using the present structure we have achieved a Gain of 18.5 ± 0.96 dB in 35 nm wide wavelength band (1526–1561 nm). We have numerically studied the effect of various waveguide and grating design parameters on transmission spectrum of the LPWG, in order to optimize Gain Flattening in the C-band of an erbium doped waveguide amplifier.
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Design of long-period waveguide grating based Gain Flattening Filter for EDWA
2012 International Conference on Fiber Optics and Photonics (PHOTONICS), 2012Co-Authors: Nandam Ashok, Vipul RastogiAbstract:We design long-period grating in a trench assisted planar waveguide to obtain Gain Flattening Filter for EDWA. Our numerical results show 18.5±1.1 dB Gain in the wavelength range 1526 - 1561 nm using the designed Filter.
