Pub Date : 2020-05-03DOI: 10.1080/01468030.2020.1800143
Sudipta Das, G. A. Sekh
ABSTRACT We consider optical pulse propagation in cubic-quintic nonlinear media and analyze the dynamics of pulse compression within the framework of variational approach. Based on a potential model we find effective pulse width for stable propagation. We see that a pulse propagating in cubic media gets compressed due to quintic nonlinearity. The value of width of a compressed pulse decreases with the increase of power. However, its minimum value is limited by the growing instability above the critical power. We explicitly examine that the compressed pulse is dynamically stable due to the competition between cubic and quintic nonlinearities.
{"title":"Dynamics of Compressed Optical Pulse in Cubic-quintic Media","authors":"Sudipta Das, G. A. Sekh","doi":"10.1080/01468030.2020.1800143","DOIUrl":"https://doi.org/10.1080/01468030.2020.1800143","url":null,"abstract":"ABSTRACT We consider optical pulse propagation in cubic-quintic nonlinear media and analyze the dynamics of pulse compression within the framework of variational approach. Based on a potential model we find effective pulse width for stable propagation. We see that a pulse propagating in cubic media gets compressed due to quintic nonlinearity. The value of width of a compressed pulse decreases with the increase of power. However, its minimum value is limited by the growing instability above the critical power. We explicitly examine that the compressed pulse is dynamically stable due to the competition between cubic and quintic nonlinearities.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"1 1","pages":"122 - 136"},"PeriodicalIF":1.7,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87728289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-03DOI: 10.1080/01468030.2020.1805529
N. Zulkipli, F. Samsamnun, A. Rosol, A. Altuncu, M. Rusdi, M. Mahyuddin, M. A. Khudus, E. Hanafi, S. Harun
ABSTRACT We generated Q-switched and mode-locked pulses by making use of the saturable absorption characteristic of scandium oxide (Sc2O3) film, which was obtained by embedding Sc2O3 nanopowders into polyvinyl alcohol film. The Q-switched laser operated at center wavelength of 1560.5 nm with the maximum pulse energy of 65.6 nJ and 4.4% slope efficiency. With the addition of a 200 m extra single-mode fiber in the ring cavity, a self-starting mode-locked EDFL was implemented. The mode-locked pulses operated at a central wavelength of 1565.4 nm with a repetition rate of 1.0 MHz and a pulse duration of 3.50 ps.
{"title":"Sc2O3 PVA Film for Switching and Mode-Locking Application in Erbium-Doped Fiber Laser Cavity","authors":"N. Zulkipli, F. Samsamnun, A. Rosol, A. Altuncu, M. Rusdi, M. Mahyuddin, M. A. Khudus, E. Hanafi, S. Harun","doi":"10.1080/01468030.2020.1805529","DOIUrl":"https://doi.org/10.1080/01468030.2020.1805529","url":null,"abstract":"ABSTRACT We generated Q-switched and mode-locked pulses by making use of the saturable absorption characteristic of scandium oxide (Sc2O3) film, which was obtained by embedding Sc2O3 nanopowders into polyvinyl alcohol film. The Q-switched laser operated at center wavelength of 1560.5 nm with the maximum pulse energy of 65.6 nJ and 4.4% slope efficiency. With the addition of a 200 m extra single-mode fiber in the ring cavity, a self-starting mode-locked EDFL was implemented. The mode-locked pulses operated at a central wavelength of 1565.4 nm with a repetition rate of 1.0 MHz and a pulse duration of 3.50 ps.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"50 1","pages":"137 - 148"},"PeriodicalIF":1.7,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74048946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-03DOI: 10.1080/01468030.2020.1768607
A. Salman, A. Al-Janabi
ABSTRACT We report on the generation of multiwavelength Q-switched pulses from a Ytterbium-doped fiber laser (YDFL) cavity by employing a nickel nanoparticle (Ni-NPs) thin film as an optical modulator. Owing to the high nonlinearity of Ni-NPs and the distinguished saturable absorption property, stable single-, dual-, triple-, or quadruple-line, Q-switched generation with a 0.7 nm channel spacing have been achieved by simply adjusting the 976 nm pump power to between 144–290 mW. At the maximum diode pump power, the output obtained from Ytterbium-doped fiber laser (YDFL) has a minimum pulse width of 138.7 ns, a maximum repetition rate of 82.4 kHz, a maximum pulse energy of 9.1 nJ and a maximum output power of 777.14 µW.
{"title":"Nickel Nanoparticles Saturable Absorber for Multiwavelength Pulses Generation in Ytterbium-Doped Fiber Laser","authors":"A. Salman, A. Al-Janabi","doi":"10.1080/01468030.2020.1768607","DOIUrl":"https://doi.org/10.1080/01468030.2020.1768607","url":null,"abstract":"ABSTRACT We report on the generation of multiwavelength Q-switched pulses from a Ytterbium-doped fiber laser (YDFL) cavity by employing a nickel nanoparticle (Ni-NPs) thin film as an optical modulator. Owing to the high nonlinearity of Ni-NPs and the distinguished saturable absorption property, stable single-, dual-, triple-, or quadruple-line, Q-switched generation with a 0.7 nm channel spacing have been achieved by simply adjusting the 976 nm pump power to between 144–290 mW. At the maximum diode pump power, the output obtained from Ytterbium-doped fiber laser (YDFL) has a minimum pulse width of 138.7 ns, a maximum repetition rate of 82.4 kHz, a maximum pulse energy of 9.1 nJ and a maximum output power of 777.14 µW.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"18 1","pages":"109 - 121"},"PeriodicalIF":1.7,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74733168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-19DOI: 10.1080/01468030.2020.1738737
M. Ferreira, M. Paul
Papers must be submitted by June 30, 2020, following Fiber and Integrated Optics instructions, to any of the Guest EditorsAcceptance of papers by July 31, 2020Final submission by August 31, 2020Pub...
{"title":"Optical Fiber Sources and Amplifiers","authors":"M. Ferreira, M. Paul","doi":"10.1080/01468030.2020.1738737","DOIUrl":"https://doi.org/10.1080/01468030.2020.1738737","url":null,"abstract":"Papers must be submitted by June 30, 2020, following Fiber and Integrated Optics instructions, to any of the Guest EditorsAcceptance of papers by July 31, 2020Final submission by August 31, 2020Pub...","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"35 1","pages":"1-2"},"PeriodicalIF":1.7,"publicationDate":"2020-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73775475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-03DOI: 10.1080/01468030.2020.1756541
Jakup Ratkoceri, B. Batagelj
ABSTRACT The existing fiber-based optical access technologies in the Republic of Kosovo are reviewed in this article. A historical background to the wireline technologies is provided with the focus on fiber-based technologies. This is combined with a description of the current deployments and the future prospects for fiber-based optical access technologies. In addition, the market share in the Kosovan telecommunications market is presented. The leading telecom companies are described as well as the impact that competition, government, and the regulatory authority have on Kosovo’s wireline market.
{"title":"Deployment of Fiber-Based Access in the Kosovan Telecommunications Market","authors":"Jakup Ratkoceri, B. Batagelj","doi":"10.1080/01468030.2020.1756541","DOIUrl":"https://doi.org/10.1080/01468030.2020.1756541","url":null,"abstract":"ABSTRACT The existing fiber-based optical access technologies in the Republic of Kosovo are reviewed in this article. A historical background to the wireline technologies is provided with the focus on fiber-based technologies. This is combined with a description of the current deployments and the future prospects for fiber-based optical access technologies. In addition, the market share in the Kosovan telecommunications market is presented. The leading telecom companies are described as well as the impact that competition, government, and the regulatory authority have on Kosovo’s wireline market.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"54 1","pages":"53 - 69"},"PeriodicalIF":1.7,"publicationDate":"2020-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80420980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-03DOI: 10.1080/01468030.2020.1749733
Shijie Song, S. Chew, Liwei Li, X. Yi, L. Nguyen, R. Minasian
ABSTRACT Microwave photonics (MWPs) is an emerging interdisciplinary field, where photonics technologies are adopted to facilitate the generation, transmission, detection, and processing of signals at radio-wave, microwave, and millimeter-wave frequencies. Recently, the integrated photonic technology has demonstrated its capability to miniaturize photonic circuits on a single chip, which paves the way for next-generation integrated MWP signal processing systems having reduced size, weight, and power consumption (SWaP) specifications. In particular, by means of incorporating complementary metal-oxide-semiconductor (CMOS) electronic, optical, and optoelectronic components on a single integrated chip, silicon photonic circuits have brought new architectures and functionalities for MWP signal processing. This accelerates the evolution of MWPs from a single-use microwave signal processor toward a multitasking and cascadable MWP system, which is readily adaptable for a wide variety of uses and applications. In this review article, we provide an overview of the fundamental principle of the MWP signal processing topology. Developments in the microwave filtering technologies are reviewed with a focus on the integrated microwave filtering enhanced by optical phase equalization. We also review the recent progress and give an outlook for the future trend in MWP signal topologies, exploring the realization of multitasking and cascadable microwave signal processing systems based on silicon photonics.
{"title":"Multitasking and Cascadable Microwave Photonic Signal Processing Topologies with Silicon Photonic Technologies","authors":"Shijie Song, S. Chew, Liwei Li, X. Yi, L. Nguyen, R. Minasian","doi":"10.1080/01468030.2020.1749733","DOIUrl":"https://doi.org/10.1080/01468030.2020.1749733","url":null,"abstract":"ABSTRACT Microwave photonics (MWPs) is an emerging interdisciplinary field, where photonics technologies are adopted to facilitate the generation, transmission, detection, and processing of signals at radio-wave, microwave, and millimeter-wave frequencies. Recently, the integrated photonic technology has demonstrated its capability to miniaturize photonic circuits on a single chip, which paves the way for next-generation integrated MWP signal processing systems having reduced size, weight, and power consumption (SWaP) specifications. In particular, by means of incorporating complementary metal-oxide-semiconductor (CMOS) electronic, optical, and optoelectronic components on a single integrated chip, silicon photonic circuits have brought new architectures and functionalities for MWP signal processing. This accelerates the evolution of MWPs from a single-use microwave signal processor toward a multitasking and cascadable MWP system, which is readily adaptable for a wide variety of uses and applications. In this review article, we provide an overview of the fundamental principle of the MWP signal processing topology. Developments in the microwave filtering technologies are reviewed with a focus on the integrated microwave filtering enhanced by optical phase equalization. We also review the recent progress and give an outlook for the future trend in MWP signal topologies, exploring the realization of multitasking and cascadable microwave signal processing systems based on silicon photonics.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"61 1","pages":"70 - 96"},"PeriodicalIF":1.7,"publicationDate":"2020-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90847735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-02DOI: 10.1080/01468030.2020.1734117
Dou Chen, Jianxin Ma
ABSTRACT In this paper, we propose and numerically simulate a microwave photonic phase-tunable frequency converter (MPPTFC) without optically filtering to realize both frequency up- and down-conversion and a full 360° phase-shift for the microwave signal based on an integrated dual-polarization dual-parallel Mach–Zehnder modulator (DP-DPMZM). In the proposed scheme, both microwave RF signal and frequency-tunable local oscillator (LO) are modulated on the lightwave by single-sideband carrier suppression (SSB-CS) modulation to generate optical orthogonally polarized optical tones carrying RF signal with up- or down-converted frequency. A PolM that can support lightwave modulation with opposite modulation indices in transverse electric (TE) and transverse magnetic (TM) modes is used to introduce a phase difference between the two modes. Then the orthogonally polarized optical tones are aligned into a single polarized state by a polarizer (Pol) and detected by a photodiode (PD), a frequency-converted and phase-shifted microwave signal can be obtained. Simulation results demonstrate that the proposed MPPTFC can up-/down-convert the microwave signal with a tunable frequency shift of LO frequency and realize a 360° continuously tunable phase shift via the DC bias voltage of the PolM simultaneously.
{"title":"Microwave Photonic Up- and Down-Converter with Tunable Phase Shift Based on an Integrated Dual-Polarization Dual-Parallel Mach–Zehnder Modulator without Optically Filtering","authors":"Dou Chen, Jianxin Ma","doi":"10.1080/01468030.2020.1734117","DOIUrl":"https://doi.org/10.1080/01468030.2020.1734117","url":null,"abstract":"ABSTRACT In this paper, we propose and numerically simulate a microwave photonic phase-tunable frequency converter (MPPTFC) without optically filtering to realize both frequency up- and down-conversion and a full 360° phase-shift for the microwave signal based on an integrated dual-polarization dual-parallel Mach–Zehnder modulator (DP-DPMZM). In the proposed scheme, both microwave RF signal and frequency-tunable local oscillator (LO) are modulated on the lightwave by single-sideband carrier suppression (SSB-CS) modulation to generate optical orthogonally polarized optical tones carrying RF signal with up- or down-converted frequency. A PolM that can support lightwave modulation with opposite modulation indices in transverse electric (TE) and transverse magnetic (TM) modes is used to introduce a phase difference between the two modes. Then the orthogonally polarized optical tones are aligned into a single polarized state by a polarizer (Pol) and detected by a photodiode (PD), a frequency-converted and phase-shifted microwave signal can be obtained. Simulation results demonstrate that the proposed MPPTFC can up-/down-convert the microwave signal with a tunable frequency shift of LO frequency and realize a 360° continuously tunable phase shift via the DC bias voltage of the PolM simultaneously.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"109 4","pages":"97 - 107"},"PeriodicalIF":1.7,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/01468030.2020.1734117","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72469762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-26DOI: 10.1080/01468030.2020.1712536
Mário F. S. Ferreira, Armando N. Pinto, Hannes Hübel
(2020). Quantum Communications. Fiber and Integrated Optics. Ahead of Print.
(2020)。量子通信。光纤与集成光学。超前印刷。
{"title":"Quantum Communications","authors":"Mário F. S. Ferreira, Armando N. Pinto, Hannes Hübel","doi":"10.1080/01468030.2020.1712536","DOIUrl":"https://doi.org/10.1080/01468030.2020.1712536","url":null,"abstract":"(2020). Quantum Communications. Fiber and Integrated Optics. Ahead of Print.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"34 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2020-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138508560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/01468030.2020.1725184
T. Lagkas, D. Klonidis, P. Sarigiannidis, Ioannis Tomkos
ABSTRACT The offering of demanding telecommunication services as promised by the 5G specifications raise the necessity for high capacity, flexible, adaptive, and power conserving fronthaul. Toward this goal, the role of the passive optical network which is responsible for interconnecting the central office (CO) with the cell-sites is crucial. Among the latest related technologies that need to be integrated in the context of the next generation passive optical networks (NGPONs), the most promising for increasing the provided bandwidth, is the optical spatial multiplexing. In this paper, we present the key 5G technologies, focusing on spatial division multiplexing, which constitutes the main innovation of the blueSPACE 5G Infrastructure Public Private Partnership (5G PPP) project. Exploiting the recent developments on multicore fibers (MCFs), optical beamforming networks (OBFNs), analog radio over fiber (ARoF), and spatial-spectral resources granularity in the context of Spectrally Spatially Flexible Optical Networks (SS-FONs), we describe a complete approach for the 5G fronthaul, emphasizing on the efficient allocation of optical resources while aiming at minimizing energy consumption. The modeled optimization problem is thoroughly presented, and the introduced scheme is evaluated through a real-world based simulation scenario, exhibiting quite promising results.
{"title":"5G/NGPON Evolution and Convergence: Developing on Spatial Multiplexing of Optical Fiber Links for 5G Infrastructures","authors":"T. Lagkas, D. Klonidis, P. Sarigiannidis, Ioannis Tomkos","doi":"10.1080/01468030.2020.1725184","DOIUrl":"https://doi.org/10.1080/01468030.2020.1725184","url":null,"abstract":"ABSTRACT The offering of demanding telecommunication services as promised by the 5G specifications raise the necessity for high capacity, flexible, adaptive, and power conserving fronthaul. Toward this goal, the role of the passive optical network which is responsible for interconnecting the central office (CO) with the cell-sites is crucial. Among the latest related technologies that need to be integrated in the context of the next generation passive optical networks (NGPONs), the most promising for increasing the provided bandwidth, is the optical spatial multiplexing. In this paper, we present the key 5G technologies, focusing on spatial division multiplexing, which constitutes the main innovation of the blueSPACE 5G Infrastructure Public Private Partnership (5G PPP) project. Exploiting the recent developments on multicore fibers (MCFs), optical beamforming networks (OBFNs), analog radio over fiber (ARoF), and spatial-spectral resources granularity in the context of Spectrally Spatially Flexible Optical Networks (SS-FONs), we describe a complete approach for the 5G fronthaul, emphasizing on the efficient allocation of optical resources while aiming at minimizing energy consumption. The modeled optimization problem is thoroughly presented, and the introduced scheme is evaluated through a real-world based simulation scenario, exhibiting quite promising results.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"50 1","pages":"23 - 4"},"PeriodicalIF":1.7,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76587868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/01468030.2020.1725185
Anis Maslo, Mujo Hodzic, E. Skaljo, A. Mujčić
ABSTRACT The first generation of installed optical cables in Eastern Europe has been in use for more than 20 years. This paper analyzes the change of optical fibers from the aspect of aging under the influence of transmitted signals and the aspect of parameter degradation during exploration. The paper provides the answer for how to repair the increased attenuation at 1310 nm. We also proposed the method of solution NG PON access for small remote villages that are situated along the analyzed route.
{"title":"Aging and Degradation of Optical Fiber Parameters in a 16-Year-Long Period of Usage","authors":"Anis Maslo, Mujo Hodzic, E. Skaljo, A. Mujčić","doi":"10.1080/01468030.2020.1725185","DOIUrl":"https://doi.org/10.1080/01468030.2020.1725185","url":null,"abstract":"ABSTRACT The first generation of installed optical cables in Eastern Europe has been in use for more than 20 years. This paper analyzes the change of optical fibers from the aspect of aging under the influence of transmitted signals and the aspect of parameter degradation during exploration. The paper provides the answer for how to repair the increased attenuation at 1310 nm. We also proposed the method of solution NG PON access for small remote villages that are situated along the analyzed route.","PeriodicalId":50449,"journal":{"name":"Fiber and Integrated Optics","volume":"116 1","pages":"39 - 52"},"PeriodicalIF":1.7,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87912648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：