The Experts below are selected from a list of 9060 Experts worldwide ranked by ideXlab platform
S Wang - One of the best experts on this subject based on the ideXlab platform.
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effects of layer thickness variations on vertical cavity surface emitting dbr semiconductor lasers
IEEE Photonics Technology Letters, 1990Co-Authors: J P Weber, K Malloy, S WangAbstract:A theoretical analysis of the influence of layer thickness variation in vertical-cavity surface-emitting lasers with distributed Bragg reflectors (DBRs) on Lasing Wavelength is presented. It is shown that changing the active region length of one of the layers in the DBR mirror by only one unit cell (0.56 nm) is sufficient to produce shifts in the Lasing Wavelength up to 0.12 nm (for an AlGaAs laser). This could limit the precision with which a desired Wavelength, its reproducibility, and its uniformity across a large wafer can be obtained. Possible influences on the linewidth of broad area devices are also discussed. >
Sang Bae Lee - One of the best experts on this subject based on the ideXlab platform.
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Room-temperature multiWavelength erbium-doped fiber ring laser based on phase modulation of semiconductor optical amplifier with Lasing-Wavelength and spacing tunability
Optical Engineering, 2007Co-Authors: Young-geun Han, Chul Han Kim, Sang Bae LeeAbstract:We have experimentally investigated a stably tunable multiWavelength erbium-doped fiber ring laser based on phase modulation of a semiconductor optical amplifier with Lasing Wavelength and spacing tunability at room temperature. Stable multiWavelength operation is obtained by direct modulation of the bias current in the amplifier. We demonstrate such a laser incorporating a tunable Lyot-Sagnac filter with two segments of polarization-maintaining fibers with Wavelength-spacing and Lasing Wavelength tunability. We successfully achieved 1.0-nm-spacing eight-channel and 0.8-nm-spacing ten-channel Lasing Wavelengths at room temperature. The Lasing Wavelength of the laser can be also controlled by a polarization controller.
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Wavelength spacing tunable multiWavelength fiber laser with Lasing Wavelength selectivity
Optics Communications, 2005Co-Authors: Young-geun Han, Gilhwan Kim, Ju Han Lee, Sang Bae LeeAbstract:Abstract We experimentally demonstrate a Wavelength spacing tunable multiWavelength fiber laser with Lasing Wavelength controllability based on a hybrid gain medium. The Wavelength spacing can be readily controlled by the effective length of PMF segments in an intracavity PMF Lyot–Sagnac filter. The Lasing Wavelength can be also controlled in a range from 1510 to 1560 nm by the effect of non-linear gain compression effect of a semiconductor optical amplifier incorporated with a C-band erbium doped fiber amplifier. The interleaved optical switching performance based on the proposed multiWavelength fiber laser was achieved depending on the relative phase difference between the two orthogonal modes.
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Wavelength spacing tunable multiWavelength fiber laser with Lasing Wavelength selectivity
OFC NFOEC Technical Digest. Optical Fiber Communication Conference 2005., 2005Co-Authors: Young-geun Han, Gilhwan Kim, Ju Han Lee, Sang Hyuck Kim, Sang Bae LeeAbstract:We experimentally demonstrate a flexibly tunable multiWavelength fiber laser with multiple functionalities like the wide tuning range of the Wavelength spacing and the Lasing Wavelength based on the hybrid gain medium.
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Lasing Wavelength and spacing switchable multiWavelength fiber laser from 1510 to 1620 nm
IEEE Photonics Technology Letters, 2005Co-Authors: Young-geun Han, Gilhwan Kim, Ju Han Lee, Sang Hyuck Kim, Sang Bae LeeAbstract:We experimentally demonstrate a flexibly switchable multiWavelength fiber laser with multiple functionalities like a wide tuning range of Lasing Wavelength, Wavelength spacing, and the number of channels simultaneously. The Lasing Wavelength is controlled in the range from 1510 to 1620 nm based on the effect of nonlinear gain compression of a semiconductor optical amplifier incorporated with an erbium-doped fiber amplifier. The Wavelength spacing and the number of channels in the multiWavelength fiber laser are readily controlled by the effective length of polarization-maintaining fiber (PMF) segments in the intracavity PMF Lyot-Sagnac filter.
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Flexibly tunable multiWavelength Raman fiber laser based on symmetrical bending method
Optics Express, 2005Co-Authors: Young-geun Han, Dae Seong Moon, Youngjoo Chung, Sang Bae LeeAbstract:A practically tunable multiWavelength Raman fiber laser based on few-mode fiber Bragg gratings without additional multichannel filters is investigated. We achieved high quality of the Raman laser output with a high extinction ratio of more than 45 dB. The number of Lasing Wavelengths can be adjusted by the properties of few-mode Bragg gratings with multiple resonant Wavelengths. The Lasing Wavelength of Raman fiber laser can be readily controlled by the tension and compression strain, which correspond to the directional bending curvature change. The dynamic range of Lasing Wavelength change was more than 15 nm.
J P Weber - One of the best experts on this subject based on the ideXlab platform.
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effects of layer thickness variations on vertical cavity surface emitting dbr semiconductor lasers
IEEE Photonics Technology Letters, 1990Co-Authors: J P Weber, K Malloy, S WangAbstract:A theoretical analysis of the influence of layer thickness variation in vertical-cavity surface-emitting lasers with distributed Bragg reflectors (DBRs) on Lasing Wavelength is presented. It is shown that changing the active region length of one of the layers in the DBR mirror by only one unit cell (0.56 nm) is sufficient to produce shifts in the Lasing Wavelength up to 0.12 nm (for an AlGaAs laser). This could limit the precision with which a desired Wavelength, its reproducibility, and its uniformity across a large wafer can be obtained. Possible influences on the linewidth of broad area devices are also discussed. >
Masahiro Yoshimoto - One of the best experts on this subject based on the ideXlab platform.
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long Wavelength emission in photo pumped gaas1 xbix laser with low temperature dependence of Lasing Wavelength
Applied Physics Letters, 2013Co-Authors: Takuma Fuyuki, Ryo Yoshioka, Kenji Yoshida, Masahiro YoshimotoAbstract:This study demonstrates long-Wavelength emission of up to 1204 nm in photo-pumped GaAs1−xBix lasers grown by molecular beam epitaxy under low temperature conditions. The characteristic temperature (T0) between 20 and 80 °C in the GaAs1−xBix lasers with Al0.3Ga0.7As electron blocking layer is approximately 100 K, which is larger than that of the typical 1.3-μm InGaAsP Fabry-Perot laser diodes (FP-LDs; T0 = 66 K). The temperature coefficient of the Lasing Wavelength is approximately 40% of that of InGaAsP FP-LDs.
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Long-Wavelength emission in photo-pumped GaAs1−xBix laser with low temperature dependence of Lasing Wavelength
Applied Physics Letters, 2013Co-Authors: Takuma Fuyuki, Ryo Yoshioka, Kenji Yoshida, Masahiro YoshimotoAbstract:This study demonstrates long-Wavelength emission of up to 1204 nm in photo-pumped GaAs1−xBix lasers grown by molecular beam epitaxy under low temperature conditions. The characteristic temperature (T0) between 20 and 80 °C in the GaAs1−xBix lasers with Al0.3Ga0.7As electron blocking layer is approximately 100 K, which is larger than that of the typical 1.3-μm InGaAsP Fabry-Perot laser diodes (FP-LDs; T0 = 66 K). The temperature coefficient of the Lasing Wavelength is approximately 40% of that of InGaAsP FP-LDs.
Young-geun Han - One of the best experts on this subject based on the ideXlab platform.
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Dual Wavelength Erbium-doped Fiber Laser with Lasing Wavelength Switchability and Tunability
Korean Journal of Optics and Photonics, 2010Co-Authors: Sangoh Park, Hyun-joo Kim, Oh-jang Kwon, Suho Chu, Min-seok Yoon, Youngbo Shim, Young-geun HanAbstract:A simple technique for a flexibly tunable and switchable dual Wavelength-switchable erbium-doped fiber (EDF) laser using fiber Bragg gratings is proposed and demonstrated by using both linear cavity loss controlling and homogeneous gain broadening of the EDF. The oscillating Wavelength switching is successfully realized by using the modulation of the acousto-optic modulator driven by the RF signal. The Wavelength spacing and Lasing Wavelength of the proposed Wavelength-switchable laser can also be controlled by using the bending-induced tension or compression strain. The proposed tunable dual Wavelength-switchable fiber laser has a lot of advantages, such as a high extinction ratio larger than 40dB and a high tunability of ~7.2 nm/.
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Room-temperature multiWavelength erbium-doped fiber ring laser based on phase modulation of semiconductor optical amplifier with Lasing-Wavelength and spacing tunability
Optical Engineering, 2007Co-Authors: Young-geun Han, Chul Han Kim, Sang Bae LeeAbstract:We have experimentally investigated a stably tunable multiWavelength erbium-doped fiber ring laser based on phase modulation of a semiconductor optical amplifier with Lasing Wavelength and spacing tunability at room temperature. Stable multiWavelength operation is obtained by direct modulation of the bias current in the amplifier. We demonstrate such a laser incorporating a tunable Lyot-Sagnac filter with two segments of polarization-maintaining fibers with Wavelength-spacing and Lasing Wavelength tunability. We successfully achieved 1.0-nm-spacing eight-channel and 0.8-nm-spacing ten-channel Lasing Wavelengths at room temperature. The Lasing Wavelength of the laser can be also controlled by a polarization controller.
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Wavelength spacing tunable multiWavelength fiber laser with Lasing Wavelength selectivity
Optics Communications, 2005Co-Authors: Young-geun Han, Gilhwan Kim, Ju Han Lee, Sang Bae LeeAbstract:Abstract We experimentally demonstrate a Wavelength spacing tunable multiWavelength fiber laser with Lasing Wavelength controllability based on a hybrid gain medium. The Wavelength spacing can be readily controlled by the effective length of PMF segments in an intracavity PMF Lyot–Sagnac filter. The Lasing Wavelength can be also controlled in a range from 1510 to 1560 nm by the effect of non-linear gain compression effect of a semiconductor optical amplifier incorporated with a C-band erbium doped fiber amplifier. The interleaved optical switching performance based on the proposed multiWavelength fiber laser was achieved depending on the relative phase difference between the two orthogonal modes.
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Wavelength spacing tunable multiWavelength fiber laser with Lasing Wavelength selectivity
OFC NFOEC Technical Digest. Optical Fiber Communication Conference 2005., 2005Co-Authors: Young-geun Han, Gilhwan Kim, Ju Han Lee, Sang Hyuck Kim, Sang Bae LeeAbstract:We experimentally demonstrate a flexibly tunable multiWavelength fiber laser with multiple functionalities like the wide tuning range of the Wavelength spacing and the Lasing Wavelength based on the hybrid gain medium.
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Lasing Wavelength and spacing switchable multiWavelength fiber laser from 1510 to 1620 nm
IEEE Photonics Technology Letters, 2005Co-Authors: Young-geun Han, Gilhwan Kim, Ju Han Lee, Sang Hyuck Kim, Sang Bae LeeAbstract:We experimentally demonstrate a flexibly switchable multiWavelength fiber laser with multiple functionalities like a wide tuning range of Lasing Wavelength, Wavelength spacing, and the number of channels simultaneously. The Lasing Wavelength is controlled in the range from 1510 to 1620 nm based on the effect of nonlinear gain compression of a semiconductor optical amplifier incorporated with an erbium-doped fiber amplifier. The Wavelength spacing and the number of channels in the multiWavelength fiber laser are readily controlled by the effective length of polarization-maintaining fiber (PMF) segments in the intracavity PMF Lyot-Sagnac filter.
