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Yong-zhen Huang - One of the best experts on this subject based on the ideXlab platform.
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Circular-side square microlasers with shifted Output Waveguide positions for mode and lasing spectrum control
Journal of the Optical Society of America B, 2020Co-Authors: Yong-heng Zhang, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side square microlasers with shifted Output Waveguide positions are demonstrated to realize mode and lasing spectrum control. Numerical simulation results indicate that the mode $Q$Q factors of the fundamental, first- and second-order transverse modes are modulated, and the Output coupling efficiency of the Output Waveguide can be greatly improved by introducing the translation of the Output Waveguide. Single-mode lasing, dual-mode lasing, and three-mode lasing are experimentally realized by changing the Output Waveguide positions. At the optimized shifted Output Waveguide position, a microlaser exhibits tunable single-mode behavior with a maximum Output power of 120 µW, a side-mode suppression ratio of 31 dB, and a linewidth of 42 MHz. Furthermore, the lasing characteristics of microlasers with different circular sides are compared.
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Lasing Spectrum Control for Circular-Side Square Microlasers with Shifted Output Waveguide Positions
2019Co-Authors: Yong-heng Zhang, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side square microlasers with shifted Output Waveguide positions are proposed and demonstrated to achieve lasing spectrum control. Single-mode lasing, dual-mode lasing and three-mode lasing are realized by changing the Output Waveguide positions.
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single mode unidirectional emission circular side hexagonal resonator microlasers
Optics Letters, 2017Co-Authors: Zhi-xiong Xiao, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side hexagonal resonator (CSHR) microlasers connecting an Output Waveguide are proposed and demonstrated for enhancing the mode Q factor and realizing single-mode operation. Three-dimensional simulation results indicate that the CSHRs with an optimized deformation can greatly enhance mode Q factors. The CSHR microlasers with Output Waveguides are fabricated using a planar technology process. For a CSHR microlaser with a side length of 7.5 μm and an Output Waveguide width of 2 μm, single-mode operation is realized with a side-mode suppression ratio of 43 dB and a threshold current of 2.5 mA. Furthermore, flat small-signal modulation responses are obtained with a 3 dB bandwidth of 13 GHz.
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Investigation of mode characteristics in rectangular microresonators for wide and continuous wavelength tuning
Frontiers of Optoelectronics, 2016Co-Authors: Ming-ying Tang, Jinlong Xiao, Yuede Yang, Shao-shuai Sui, Yong-zhen HuangAbstract:The mode characteristics are investigated for the rectangular microresonators with an Output Waveguide connected to the midpoint of the long side for wide and continuous wavelength tuning. Through adjusting the aspect ratio of the rectangular microresonator, the mode Q factors can be greatly enhanced. Furthermore, the large mode interval between the high-Q modes makes the rectangular microresonators suitable for tunable lasers. As a special case, single-mode operation is achieved with a continuous tuning range of 9.1 nm for a square microlaser with the side length of 17.8 mm and the Output Waveguide width of 1.8 mm.
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Mode selection in square resonator microlasers for widely tunable single mode lasing.
Optics express, 2015Co-Authors: Ming-ying Tang, Jinlong Xiao, Yuede Yang, Shao-shuai Sui, Yong-zhen HuangAbstract:Mode selection in square resonator semiconductor microlasers is demonstrated by adjusting the width of the Output Waveguide coupled to the midpoint of one side. The simulation and experimental results reveal that widely tunable single mode lasing can be realized in square resonator microlasers. Through adjusting the width of the Output Waveguide, the mode interval of the high-Q modes can reach four times of the longitudinal mode interval. Therefore, mode hopping can be efficiently avoided and the lasing wavelength can be tuned continuously by tuning the injection current. For a 17.8-μm-side-length square microlaser with a 1.4-μm-width Output Waveguide, mode-hopping-free single-mode operation is achieved with a continuous tuning range of 9.2 nm. As a result, the control of the lasing mode is realized for the square microlasers.
Jinlong Xiao - One of the best experts on this subject based on the ideXlab platform.
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Circular-side square microlasers with shifted Output Waveguide positions for mode and lasing spectrum control
Journal of the Optical Society of America B, 2020Co-Authors: Yong-heng Zhang, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side square microlasers with shifted Output Waveguide positions are demonstrated to realize mode and lasing spectrum control. Numerical simulation results indicate that the mode $Q$Q factors of the fundamental, first- and second-order transverse modes are modulated, and the Output coupling efficiency of the Output Waveguide can be greatly improved by introducing the translation of the Output Waveguide. Single-mode lasing, dual-mode lasing, and three-mode lasing are experimentally realized by changing the Output Waveguide positions. At the optimized shifted Output Waveguide position, a microlaser exhibits tunable single-mode behavior with a maximum Output power of 120 µW, a side-mode suppression ratio of 31 dB, and a linewidth of 42 MHz. Furthermore, the lasing characteristics of microlasers with different circular sides are compared.
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Lasing Spectrum Control for Circular-Side Square Microlasers with Shifted Output Waveguide Positions
2019Co-Authors: Yong-heng Zhang, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side square microlasers with shifted Output Waveguide positions are proposed and demonstrated to achieve lasing spectrum control. Single-mode lasing, dual-mode lasing and three-mode lasing are realized by changing the Output Waveguide positions.
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single mode unidirectional emission circular side hexagonal resonator microlasers
Optics Letters, 2017Co-Authors: Zhi-xiong Xiao, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side hexagonal resonator (CSHR) microlasers connecting an Output Waveguide are proposed and demonstrated for enhancing the mode Q factor and realizing single-mode operation. Three-dimensional simulation results indicate that the CSHRs with an optimized deformation can greatly enhance mode Q factors. The CSHR microlasers with Output Waveguides are fabricated using a planar technology process. For a CSHR microlaser with a side length of 7.5 μm and an Output Waveguide width of 2 μm, single-mode operation is realized with a side-mode suppression ratio of 43 dB and a threshold current of 2.5 mA. Furthermore, flat small-signal modulation responses are obtained with a 3 dB bandwidth of 13 GHz.
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Investigation of mode characteristics in rectangular microresonators for wide and continuous wavelength tuning
Frontiers of Optoelectronics, 2016Co-Authors: Ming-ying Tang, Jinlong Xiao, Yuede Yang, Shao-shuai Sui, Yong-zhen HuangAbstract:The mode characteristics are investigated for the rectangular microresonators with an Output Waveguide connected to the midpoint of the long side for wide and continuous wavelength tuning. Through adjusting the aspect ratio of the rectangular microresonator, the mode Q factors can be greatly enhanced. Furthermore, the large mode interval between the high-Q modes makes the rectangular microresonators suitable for tunable lasers. As a special case, single-mode operation is achieved with a continuous tuning range of 9.1 nm for a square microlaser with the side length of 17.8 mm and the Output Waveguide width of 1.8 mm.
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Mode selection in square resonator microlasers for widely tunable single mode lasing.
Optics express, 2015Co-Authors: Ming-ying Tang, Jinlong Xiao, Yuede Yang, Shao-shuai Sui, Yong-zhen HuangAbstract:Mode selection in square resonator semiconductor microlasers is demonstrated by adjusting the width of the Output Waveguide coupled to the midpoint of one side. The simulation and experimental results reveal that widely tunable single mode lasing can be realized in square resonator microlasers. Through adjusting the width of the Output Waveguide, the mode interval of the high-Q modes can reach four times of the longitudinal mode interval. Therefore, mode hopping can be efficiently avoided and the lasing wavelength can be tuned continuously by tuning the injection current. For a 17.8-μm-side-length square microlaser with a 1.4-μm-width Output Waveguide, mode-hopping-free single-mode operation is achieved with a continuous tuning range of 9.2 nm. As a result, the control of the lasing mode is realized for the square microlasers.
Yuede Yang - One of the best experts on this subject based on the ideXlab platform.
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Circular-side square microlasers with shifted Output Waveguide positions for mode and lasing spectrum control
Journal of the Optical Society of America B, 2020Co-Authors: Yong-heng Zhang, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side square microlasers with shifted Output Waveguide positions are demonstrated to realize mode and lasing spectrum control. Numerical simulation results indicate that the mode $Q$Q factors of the fundamental, first- and second-order transverse modes are modulated, and the Output coupling efficiency of the Output Waveguide can be greatly improved by introducing the translation of the Output Waveguide. Single-mode lasing, dual-mode lasing, and three-mode lasing are experimentally realized by changing the Output Waveguide positions. At the optimized shifted Output Waveguide position, a microlaser exhibits tunable single-mode behavior with a maximum Output power of 120 µW, a side-mode suppression ratio of 31 dB, and a linewidth of 42 MHz. Furthermore, the lasing characteristics of microlasers with different circular sides are compared.
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Lasing Spectrum Control for Circular-Side Square Microlasers with Shifted Output Waveguide Positions
2019Co-Authors: Yong-heng Zhang, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side square microlasers with shifted Output Waveguide positions are proposed and demonstrated to achieve lasing spectrum control. Single-mode lasing, dual-mode lasing and three-mode lasing are realized by changing the Output Waveguide positions.
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single mode unidirectional emission circular side hexagonal resonator microlasers
Optics Letters, 2017Co-Authors: Zhi-xiong Xiao, Yong-zhen Huang, Yuede Yang, Jinlong XiaoAbstract:Circular-side hexagonal resonator (CSHR) microlasers connecting an Output Waveguide are proposed and demonstrated for enhancing the mode Q factor and realizing single-mode operation. Three-dimensional simulation results indicate that the CSHRs with an optimized deformation can greatly enhance mode Q factors. The CSHR microlasers with Output Waveguides are fabricated using a planar technology process. For a CSHR microlaser with a side length of 7.5 μm and an Output Waveguide width of 2 μm, single-mode operation is realized with a side-mode suppression ratio of 43 dB and a threshold current of 2.5 mA. Furthermore, flat small-signal modulation responses are obtained with a 3 dB bandwidth of 13 GHz.
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Investigation of mode characteristics in rectangular microresonators for wide and continuous wavelength tuning
Frontiers of Optoelectronics, 2016Co-Authors: Ming-ying Tang, Jinlong Xiao, Yuede Yang, Shao-shuai Sui, Yong-zhen HuangAbstract:The mode characteristics are investigated for the rectangular microresonators with an Output Waveguide connected to the midpoint of the long side for wide and continuous wavelength tuning. Through adjusting the aspect ratio of the rectangular microresonator, the mode Q factors can be greatly enhanced. Furthermore, the large mode interval between the high-Q modes makes the rectangular microresonators suitable for tunable lasers. As a special case, single-mode operation is achieved with a continuous tuning range of 9.1 nm for a square microlaser with the side length of 17.8 mm and the Output Waveguide width of 1.8 mm.
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Mode selection in square resonator microlasers for widely tunable single mode lasing.
Optics express, 2015Co-Authors: Ming-ying Tang, Jinlong Xiao, Yuede Yang, Shao-shuai Sui, Yong-zhen HuangAbstract:Mode selection in square resonator semiconductor microlasers is demonstrated by adjusting the width of the Output Waveguide coupled to the midpoint of one side. The simulation and experimental results reveal that widely tunable single mode lasing can be realized in square resonator microlasers. Through adjusting the width of the Output Waveguide, the mode interval of the high-Q modes can reach four times of the longitudinal mode interval. Therefore, mode hopping can be efficiently avoided and the lasing wavelength can be tuned continuously by tuning the injection current. For a 17.8-μm-side-length square microlaser with a 1.4-μm-width Output Waveguide, mode-hopping-free single-mode operation is achieved with a continuous tuning range of 9.2 nm. As a result, the control of the lasing mode is realized for the square microlasers.
Shijiang Wang - One of the best experts on this subject based on the ideXlab platform.
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algainas inp microcylinder lasers connected with an Output Waveguide
IEEE Photonics Technology Letters, 2010Co-Authors: Shijiang Wang, Yong-zhen Huang, Yuede Yang, Jinlong Xiao, Yun DuAbstract:AlGaInAs-InP microcylinder lasers connected with an Output Waveguide are fabricated by planar technology. Room-temperature continuous-wave operation with a threshold current of 8 mA is realized for a microcylinder laser with the radius of 10 μm and the Output Waveguide width of 2 μm. The mode Q-factor of 1.2 x 104 is measured from the laser spectrum at the threshold. Coupled mode characteristics are analyzed by 2-D finite-difference time-domain simulation and the analytical solution of whispering-gallery modes. The calculated mode Q-factors of coupled modes are in the same order as the measured value.
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AlGaInAs–InP Microcylinder Lasers Connected With an Output Waveguide
IEEE Photonics Technology Letters, 2010Co-Authors: Shijiang Wang, Yong-zhen Huang, Yuede Yang, Jinlong Xiao, Kaijun Che, Jian-dong Lin, Zhongchao FanAbstract:AlGaInAs-InP microcylinder lasers connected with an Output Waveguide are fabricated by planar technology. Room-temperature continuous-wave operation with a threshold current of 8 mA is realized for a microcylinder laser with the radius of 10 μm and the Output Waveguide width of 2 μm. The mode Q-factor of 1.2 x 104 is measured from the laser spectrum at the threshold. Coupled mode characteristics are analyzed by 2-D finite-difference time-domain simulation and the analytical solution of whispering-gallery modes. The calculated mode Q-factors of coupled modes are in the same order as the measured value.
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Mode coupling and directional emission in mirocylinder lasers
22nd IEEE International Semiconductor Laser Conference, 2010Co-Authors: Yong-zhen Huang, Shijiang Wang, Yuede Yang, Kaijun Che, Jian-dong Lin, Jinlong XiaoAbstract:CW Electrically injected AlGaInAs/InP microcylinder lasers are realized with 10µm radius and a 2µm-wide Output Waveguide at room temperature. High Output efficiency is predicted for coupled microcylinders with an Output Waveguide by 2D FDTD simulation.
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investigation of mode coupling in a microdisk resonator for realizing directional emission
Optics Express, 2009Co-Authors: Yuede Yang, Shijiang Wang, Yong-zhen HuangAbstract:Mode coupling between the whispering-gallery modes (WGMs) is numerically investigated for a two-dimensional microdisk resonator with an Output Waveguide. The equilateral-polygonal shaped mode patterns can be constructed by mode coupling in the microdisk, and the coupled modes can still keep high quality factors (Q factors). For a microdisk with a diameter of 4.5 mu m and a refractive index of 3.2 connected to a 0.6-mu m-wide Output Waveguide, the coupled mode at the wavelength of 1490 nm has a Q factor in the order of 10(4), which is ten times larger than those of the uncoupled WGMs, and the Output efficiency defined as the ratio of the energy flux confined in the Output Waveguide to the total radiation energy flux is about 0.65. The mode coupling can be used to realize high efficiency directional-emission microdisk lasers. (C) 2009 Optical Society of America
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optical bistability in inp gainasp equilateral triangle resonator microlasers
Optics Letters, 2009Co-Authors: Yong-zhen Huang, Shijiang Wang, Yuede Yang, Jinlong XiaoAbstract:Optical bistability is reported in InP/GaInAsP equilateral-triangle-resonator (ETR) microlasers, which are fabricated by planar technology. For a 30 mu m side ETR microlaser with a 2-mu m-wide Output Waveguide connected to one of the vertices of the ETR, hysteresis loops are observed for the Output power versus the injection current from 215 to 235 K. The laser Output spectra are measured in the upper and lower states of the hysteresis loop, which show strong mode competition among transverse modes. The hysteresis loops are demonstrated by two-mode rate equations with asymmetric cross gain saturation and different Output efficiencies. (C) 2009 Optical Society of America
Yun Du - One of the best experts on this subject based on the ideXlab platform.
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mode characteristics for unidirectional emission microring resonator lasers
Journal of The Optical Society of America B-optical Physics, 2014Co-Authors: Xiaomeng Lv, Yong-zhen Huang, Yuede Yang, Jinlong Xiao, Yun DuAbstract:Mode characteristics are investigated numerically and experimentally for microring resonator lasers directly connected to an Output Waveguide. Optimized structural parameters are proposed for the microring resonators for realizing single-mode and unidirectional-emission operation. Finite-difference time-domain simulations indicate that the inner wall of the microring resonators introduces additional radiation loss and scattering loss, and so suppresses the higher-order transverse modes with higher field distributions in the internal region of the microrings. However, the mode Q factors can be enhanced several times for some modes with suitable inner-wall radii. AlGaInAs/InP microring lasers with inner-wall radii of 0, 5, and 7 μm and an outer-wall radius of 10 μm connected to a 2-μm-wide Output Waveguide are fabricated by planar techniques. Lasing spectra with longitudinal mode wavelength intervals of 11–12 nm and side-mode suppression ratios of 28–36 dB are observed, and suppression of higher-order transverse modes is achieved as the prediction of the simulation results.
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mode characteristics of unidirectional emission algainas inp square resonator microlasers
IEEE Journal of Quantum Electronics, 2014Co-Authors: Heng Long, Yong-zhen Huang, Yuede Yang, Jinlong Xiao, Xiaomeng Lv, Yun DuAbstract:Mode characteristics of AlGaInAs/InP square resonator microlasers laterally confined by a bisbenzocyclobutene layer, with an Output Waveguide connected to one vertex or the midpoint of one side, are investigated numerically and experimentally. Numerical simulation results indicate that the square resonator with the midpoint Output Waveguide has a better single-mode property, but a lower mode \({Q}\) -factor than that with the vertex Output Waveguide. For a 20- \(\mu \) m-side-length square microlaser with a 1.5- \(\mu \) m-wide vertex Output Waveguide, lasing spectra with multiple transverse modes are observed with the mode wavelength intervals agreeing with the 2-D-finite difference time domain simulation results. In contrast, single-mode operation with a side-mode suppression ratio of 42 dB is obtained for a 20- \(\mu \) m-side-length square microlaser with a 1.5- \(\mu \) m-wide midpoint Output Waveguide. The results indicate that Output Waveguide can result in a mode selection in addition to realizing unidirectional emission.
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mode analysis for unidirectional emission algainas inp octagonal resonator microlasers
IEEE Journal of Selected Topics in Quantum Electronics, 2013Co-Authors: Xiaomeng Lv, Yong-zhen Huang, Jinlong Xiao, Heng Long, Yun DuAbstract:We investigate mode characteristics for octagonal resonator microlasers directly connecting an Output Waveguide. The threshold current of 8 mA at 286 K and single-transverse-mode operation are realized for an octagonal resonator microlaser with a side length of 10.8 μm and a 2-μm-wide vertex Output Waveguide. The laser spectra of multiple longitudinal modes with mode wavelength intervals of 7-8 nm are observed accompanied with three weak, higher order transverse modes. Furthermore, blueshift of mode wavelength versus the injection current around the threshold current and the far-field patterns are measured and discussed. In addition, the mode characteristics of the octagonal microresonators are simulated by the two-dimensional finite-difference time-domain technique. Two sets of high-Q longitudinal modes are observed experimentally and numerically, for the octagonal resonators with the Output Waveguide connected to the vertex and the midpoint of one side of the resonators, respectively.
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unidirectional emission single mode algainas inp microcylinder lasers
IEEE Photonics Technology Letters, 2012Co-Authors: Xiaomeng Lv, Yong-zhen Huang, Yuede Yang, Jinlong Xiao, Yun DuAbstract:AlGaInAs-InP microcylinder lasers with an Output Waveguide surrounded by benzocyclobutene are fabricated, using standard photolithography and inductively coupled-plasma etching technique. Room-temperature continuous-wave (CW) operation is realized for a microlaser with a radius of 20 μm and a 2-μm-wide Output Waveguide. Single-mode operation with side-mode suppression ratio around 25 dB is achieved, and the wavelength shifts from 1563.5 to 1567.3 nm with the injection current increases from 50 to 100 mA. The characteristic temperature of the threshold current is 58 K, obtained by fitting the Output power versus the injection current with analytical relations. The practical laser temperature is expected to be about 391 K at the CW injection current of 130 mA.
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algainas inp microcylinder lasers connected with an Output Waveguide
IEEE Photonics Technology Letters, 2010Co-Authors: Shijiang Wang, Yong-zhen Huang, Yuede Yang, Jinlong Xiao, Yun DuAbstract:AlGaInAs-InP microcylinder lasers connected with an Output Waveguide are fabricated by planar technology. Room-temperature continuous-wave operation with a threshold current of 8 mA is realized for a microcylinder laser with the radius of 10 μm and the Output Waveguide width of 2 μm. The mode Q-factor of 1.2 x 104 is measured from the laser spectrum at the threshold. Coupled mode characteristics are analyzed by 2-D finite-difference time-domain simulation and the analytical solution of whispering-gallery modes. The calculated mode Q-factors of coupled modes are in the same order as the measured value.