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Your search keyword '"Peng, Qin"' showing total 17 results
Start Over Author "Peng, Qin" Journal applied optics
17 results on '"Peng, Qin"'

4. Joint nonlinear optical signal-to-noise ratio estimation and modulation format identification based on constellation-points trajectory information and multitask 1DCNN for WDM systems

Author

Zhiguo Wang, Chenglin Bai, Lishan Yang, Xinyu Chi, Peng Qin, Xueyuan Luo, Hengying Xu, and Peiyun Ge

Subjects
Electrical and Electronic Engineering, Engineering (miscellaneous), Atomic and Molecular Physics, and Optics
Abstract

We propose a joint monitoring scheme of nonlinear optical signal-to-noise ratio ( O S N R N L ) estimation and modulation format identification (MFI) in wavelength division multiplexing (WDM) systems. Based on the abundant information of both nonlinear noise (NLN) and modulation format (MF) in received signals, this scheme first counts the trajectory information of all adjacent constellation points, and then quantifies them into the adjacent matrix. Subsequently, the eigenvectors corresponding to the largest eigenvalues are extracted via eigen-decomposition of the adjacent matrix, which characterize the information of NLN and MF effectively. Finally, the eigenvectors are fed into multitask one-dimensional convolutional neural network to perform O S N R N L estimation and MFI simultaneously. To verify the effectiveness of the scheme, five-channel 28 GBaud polarization division multiplexing (PDM) − 16 / 32 / 64 quadrature amplitude modulation (QAM) WDM simulation systems are built by VPI. The simulation results demonstrate that, for PDM-16/32/64QAM signals, the mean absolute errors of O S N R N L estimation are 0.18, 0.17, and 0.20 dB, respectively. At the same time, the identification accuracy rates of these three MFs have achieved 100% within the ranges of estimated O S N R N L . Furthermore, a three-channel 28 GBaud WDM experimental system is constructed to further investigate the effectiveness of trajectory information for O S N R N L estimation. The experimental results show that the O S N R N L estimation errors of PDM-16QAM are less than 0.5 dB. In addition, our analysis of complexity from two aspects of trajectory information extraction and neural network model shows that the overall complexity scale of this scheme is O ( K i , 3 M C i , 3 C o , 3 ) .

Published
2022

7. Compact high-efficiency 100-W-level diode-side-pumped Nd:YAG laser with linearly polarized [TEM.sub.00] mode output

Author

Xu, Yi-Ting, Xu, Jia-Lin, Guo, Ya-Ding, Yang, Feng-Tu, Chen, Yan-Zhong, Xu, Jian, Xie, Shi-Yong, Bo, Yong, Peng, Qin-Jun, Cui, Dafu, and Xu, Zu-Yan

Subjects
Oscillators (Electronics) -- Design and construction, Oscillators (Electronics) -- Optical properties, Semiconductor lasers -- Properties, Engineering design -- Methods, Astronomy, Physics
Abstract

We present a compact high-efficiency and high-average-power diode-side-pumped Nd:YAG rod laser oscillator operated with a linearly polarized fundamental mode. The oscillator resonator is based on an L-shaped convex--convex cavity with an improved module and a dual-rod configuration for birefringence compensation. Under a pump power of 344 W, a linearly polarized average output power of 101.4 W at 1064 nm is obtained, which corresponds to an optical-to-optical conversion efficiency of 29.4%. The laser is operated at a repetition rate of 400 Hz with a beam quality factor of [M.sup.2] = 1.14. To the best of our knowledge, this is the highest optical-to-optical efficiency for a side-pumped [TEM.sub.00] Nd:YAG rod laser oscillator with a 100-W-level output ever reported. [c] 2010 Optical Society of America OCIS codes: 140.3480, 140.3530, 140.3580.

Published
2010

9. Void-free bonding for a large slab laser crystal

Author

Lin, Yan-Yong, primary, Gao, Hong-Wei, additional, Chen, Zhong-Zheng, additional, Xu, Jia-Lin, additional, Yuan, Lei, additional, Zuo, Jun-Wei, additional, Xu, Yi-Ting, additional, Guo, Ya-Ding, additional, Wang, Bao-Shan, additional, Xu, Jian, additional, Bo, Yong, additional, Peng, Qin-Jun, additional, and Xu, Zu-Yan, additional

Published
2020
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10. QCW surface-pumped cryogenically cooled single-slab laser with 1??kW level at 946??nm

Author

Song, Ze-Xin, Wang, Bao-Shan, Shen, Yu, Bo, Yong, Chang, Jin-Quan, Chen, Zhong-Zheng, Guo, Ya-Ding, Yuan, Lei, Lin, Yan-Yong, Kou, Yang, Bian, Qi, Cui, Da-Fu, and Peng, Qin-Jun

Abstract

We present a kilowatt-level quasi-continuous-wave (QCW) cryogenically cooled 946-nm slab laser oscillator for the first time, to the best of our knowledge. The laser system is based on a double-face-pumped large-size single-slab Nd:YAG design, delivering a record-high average power of 1.06 kW without additional amplification. This laser oscillator operates at repetition rate of 400 Hz with a pulse duration of 175 µs, resulting in a single pulse energy of 2.65 J. To the best of our knowledge, these results represent the highest output power and pulse energy for any all-solid-state 946-nm laser ever reported to date. Our scheme paves a new path for the development of the compact high-power solid-state 946-nm laser.

Published
2022

11. 2.55??W continuous-wave 378??nm laser by intracavity frequency doubling of a diode-pumped Alexandrite laser

Author

Song, Yue, Wang, Zhi-Min, Bo, Yong, Zhang, Feng-Feng, Zhang, Yi-Xuan, Zong, Nan, and Peng, Qin-Jun

Abstract

A high-power continuous-wave (CW) ultraviolet (UV) laser at 378 nm from an intracavity frequency-doubled Alexandrite laser has been demonstrated with 638 nm fiber-coupled laser diodes as the pump source. A maximum output power of 2.55 W was obtained, which is the highest power for CW frequency-doubled Alexandrite lasers, to the best of our knowledge, corresponding to the optical-to-optical conversion efficiency of 7.9% from 638 nm pump laser to 378 nm UV laser. The beam quality factors M^2 were measured to be 2.19 and 2.47 in x and y directions at UV output power of 1 W, respectively.

Published
2021

12. 30??W single-frequency continuous-wave master oscillator power amplifier laser at 1342??nm

Author

Liu, Xu-Chao, Zhang, Feng-Feng, Wang, Zhi-Min, Zong, Nan, Bo, Yong, Peng, Qin-Jun, and Xu, Zu-Yan

Abstract

We present a power-scalable high-power single-frequency continuous-wave 1342 nm master oscillator power amplifier (MOPA) system that consists of a polarized single-frequency 1342 nm LD seed laser, a Raman fiber preamplifier, and a three-stage ${\rm Nd}:{{\rm YVO}_4}$Nd:YVO_4 power amplifier. The single-frequency output power of 30 W at 1342 nm is achieved with the beam quality factors ${{\rm M}^{2\:}} = {1}.{26}$M^2=1.26, and the power stability for 1 h is better than ${\pm }\;{0}.{5}\% $±0.5%.

Published
2020

14. 82 kW high beam quality quasi-continuous-wave face-pumped Nd:YAG slab amplifier

Author

Chen, Zhong-zheng, primary, Xu, Yi-ting, additional, Guo, Ya-ding, additional, Wang, Bao-shan, additional, Xu, Jian, additional, Xu, Jia-lin, additional, Gao, Hong-wei, additional, Yuan, Lei, additional, Yuan, Hong-tao, additional, Lin, Yan-yong, additional, Xiao, Yun-sheng, additional, Bo, Yong, additional, Peng, Qin-jun, additional, Lei, Wen-qiang, additional, Cui, Da-fu, additional, and Xu, Zu-yan, additional

Published
2015
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17. Multilevel synergically controlling wavefront correction of a high-power slab laser system.

Author

Xu YZ, Zhang L, Shao CF, Tan QW, Zang ZG, Lang BT, Chen ZZ, Song YJ, Wang XJ, and Peng QJ

Abstract

We present a multilevel synergically controlling wavefront correction method that can apply in a slab laser system. To fully utilize the response frequency and the stroke of actuators of the single deformable mirror (DM), we design a set of multilevel wavefront correction devices to reduce the root-mean square of wavefront aberration before the DM. As the wavefront of slab geometry solid-state lasers mainly consists of fourth and longitudinally distributed aberration, such as 5th, 9th, and 14th orders of Legendre polynomials. We design a precompensating level of the aberration with a slow-drift mirror, fast-steer mirror, one-dimensional adjustable slab-aberration compensator, and beam-shaping system to reduce these orders of wavefront aberration with low spatial resolution and large stroke. As the controlling bandwidth of different devices is diverse, the coupling oscillation between the precompensating level and adaptive optics (AO) level occurs, then we develop the multilevel synergically control to address the coupling. With the precompensating level, the experimental result shows the residual wavefront aberration of the slab laser is compensated well by the AO level effectively within the compensating capability. We clean up a 9.8 kW slab laser system with the beam quality β of far-field focus spots improved from 17.71 to 2.24 times the diffraction limit.

Published
2023
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