Microwave and Optical Technology Letters最新文献

{"title":"Low-Profile Beam-Steering Metasurface Lens Antenna Utilizing Defocused Array Feed Without Amplitude–Phase Network","authors":"Zi-Hao Fu,&nbsp;Xue-Song Yang","doi":"10.1002/mop.70064","DOIUrl":"https://doi.org/10.1002/mop.70064","url":null,"abstract":"<div>\u0000 \u0000 <p>The present study introduces a low-profile beam-steering metasurface lens antenna (MLA) that is excited by a defocused array antenna (DAA), eliminating the need for amplitude and phase excitation modulation. First, we modify an ultrathin Huygens' unit cell to provide greater angular stability, which is intended for use in beam-steering lens antennas. Subsequently, we analyze the effect of the focal–diameter ratio (<i>F</i>/<i>D</i>) on the beam-steering performance of the lens. Further, a one-dimensional (1D) MLA equipped with a DAA is modeled. Based on this model, we investigate the influence of DAA distance from the lens, DAA diameter, and <i>F</i>/<i>D</i> on radiation directivity and scanning capability. By adjusting the distance between the DAA and the lens, sub-arrays located in different regions of the DAA can be excited with uniform amplitude and phase, enabling dual-polarized single-beam scanning radiation. This excitation technique eliminates the need for amplitude and phase modulation networks, thereby reducing beam-steering costs and the complexity of the feed network. Finally, a 10<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>λ</mi>\u0000 \u0000 <mn>0</mn>\u0000 </msub>\u0000 \u0000 <mo>×</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${lambda }_{0}times $</annotation>\u0000 </semantics></math>10<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>λ</mi>\u0000 \u0000 <mn>0</mn>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${lambda }_{0}$</annotation>\u0000 </semantics></math> MLA prototype excited by a 52-unit dual-polarized DAA is simulated and fabricated. The simulation and measurement results demonstrate that the proposed MLA achieves a scanning range of ± 15°/± 16° in the <i>E</i>/<i>H</i>-plane at 10.3 GHz, with a gain fluctuation of less than 2.35/2.25 dB.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-Insertion-Loss, High-Power Rectangular Waveguide-To-Coaxial Transition","authors":"Qian Li,&nbsp;Kaijun Song,&nbsp;Xinjun Zou,&nbsp;Yong Fan","doi":"10.1002/mop.70047","DOIUrl":"https://doi.org/10.1002/mop.70047","url":null,"abstract":"<div>\u0000 \u0000 <p>A low-insertion-loss, high-power rectangular waveguide-to-coaxial transition is proposed in this letter. The proposed rectangular waveguide-to-coaxial transition is constructed by a rectangular-waveguide H–T junction and square coaxes. The H-plane T-junction is used to convert the input wave into two in-phase waves. After passing through three 90° bends, the electric field vectors of the two in-phase waves are in opposite directions. Then they combine at the coaxial port. The TE10 mode in the rectangular waveguide is converted to the TEM mode in the coaxial line by the transition ridge. The power capacity of the transition is increased by the N-type connector. For verification, an X-band rectangular waveguide-to-coaxial transition has been designed, fabricated, and measured. The measured results show that the 20-dB fractional bandwidth is 22.4%. The insertion loss is no more than 0.1 dB. The transmission efficiency is 97.7%. And the power capacity can reach 65 kW.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporally Modulated Array Antenna Featuring Nonreciprocal Radiation Beam","authors":"Jiawei Zang,&nbsp;Shouyuan Wang,&nbsp;Ziren Wang,&nbsp;Rui Ji,&nbsp;Juan Pan","doi":"10.1002/mop.70072","DOIUrl":"https://doi.org/10.1002/mop.70072","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper proposes a nonreciprocal array antenna based on spatiotemporal modulation. This approach relies on the drastically different phase response during the frequency conversion processes in the time-modulated antenna element. A prototype linear array composed of a pair of resonant patches is designed and fabricated for proof-of-concept validation. Measured results are in good agreement with simulation. The results show that the proposed array antenna is capable of providing versatile radiation performance for transmission and reception, including reciprocal transmission and reception radiation beams, nonreciprocal symmetric transmission and reception radiation beams, and nonreciprocal asymmetric transmission and reception radiation beams, by manipulating the RF signal phase and modulation signal phase.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compact Non-Planner Inverted Stacked Modified Microstrip Antenna With Enhanced Performance of Ultra-Wideband Applications","authors":"Sonmati Verma,&nbsp;Rajiv Kumar Singh,&nbsp;Neelam Srivastava,&nbsp;Alka Verma,&nbsp;Anirban Sarkar","doi":"10.1002/mop.70063","DOIUrl":"https://doi.org/10.1002/mop.70063","url":null,"abstract":"<div>\u0000 \u0000 <p>This article introduces a compact non-planner inverted stacked microstrip antenna tailored for ultrawideband (UWB) applications. The innovative design of the antenna features a folded feed technique combined with a slotted lower patch and an additional parasitic upper patch, showcasing a novel approach to enhancing performance. Compactness is achieved by integrating a shorting wall, significantly reducing the antenna size without compromising performance. The proposed antenna demonstrates exceptional simulated bandwidth (S11&lt;−10 dB) of 11020 MHz (3.6–14.62 GHz), equivalent to 120.9%, and measured impedance bandwidth of 11310 MHz (3.63–14.94 GHz), reflecting a substantial fractional bandwidth of 121.80%. Furthermore, it achieves a peak gain of 9 dBi, making it highly suitable for UWB operations. The combination of its compact size, extensive bandwidth, and stable radiation patterns makes this antenna a highly effective and appropriate choice for UWB technology.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-Layer Miniaturized Wideband Antenna Based on Stub-Loaded Metasurface","authors":"Jie Li","doi":"10.1002/mop.70052","DOIUrl":"https://doi.org/10.1002/mop.70052","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;This paper proposes a single-layer miniaturized wideband antenna based on the stub-loaded metasurface (MS) structure. The stub is loaded at the edge of a square MS cell and inserted into the gap between two adjacent cells, enhancing the surface capacitance and reducing the resonance frequency. Consequently, the stub-loaded MS structure can provide the resonance frequency of the conventional square MS structure while having a smaller aperture. In this way, a miniaturized wideband MS antenna based on the stub-loaded MS structure is designed. It has a bandwidth of 41% (4.5−6.82 GHz) and a compact size of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;.&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;38&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 \u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;.&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;38&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $0.38{{rm{lambda }}}_{0}times 0.38{{rm{lambda }}}_{0}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; (where&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $,{{rm{lambda }}}_{0}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; is the wavelength at the center frequency). Subsequently, based on this miniaturized MS antenna, the partial peripheral cells, which initially have little effect on radiation, are modified to obtain a sufficiently excited radiation aperture, resulting in a larger bandwidth of 47% (4.61−7.43 GHz) with a size of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;.&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 \u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;.&lt;/mo","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Symmetrical In-Band Full-Duplex Antenna With Broad Bandwidth Using Stacked Patch Array","authors":"D. Venkata Siva Prasad,&nbsp;Shrivishal Tripathi,&nbsp;Punya P. Paltani","doi":"10.1002/mop.70062","DOIUrl":"https://doi.org/10.1002/mop.70062","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;This article proposes a novel symmetrical design for a Broadband Bidirectional In-band Full-duplex (IBFD) co-radiator antenna with high isolation. The distinctive double differential feed network, constructed using orthogonally arranged meander slot baluns, is connected to a pair of co-radiating patches with the metallic visa, resulting in structural symmetry and offering bidirectional radiation patterns. The null-coupling features of the balun, that is, the differential potentials and differential filtering, generate good isolation in the antenna with a narrow bandwidth. The limitation of narrow bandwidth has been overcome by employing a stacked patch array above the radiating patch. The installed &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $2times 2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; stacked patch array generates additional resonating modes due to the induced surface waves and enhances the operational bandwidth of the antenna. The multiple techniques of polarization diversity, double differential feed, and stacked patch array in the antenna offer a minimum isolation of 62 dB over a wide operational band of (1.8–2.9) GHz. It offers bidirectional broadside radiation having a lower cross-polar of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;&lt;&lt;/mo&gt;\u0000 \u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;25&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $lt -25$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; dB. Moreover, the structural symmetry of the antenna produces identical S-parameters, gain, and radiation patterns for both antenna ports. The fabricated prototype of the proposed antenna with overall dimensions of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0.66&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;0.66&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;0.122&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 \u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mtext&gt;min&lt;/mtext&gt;\u0000 &lt;/msub&gt;\u0000 &lt;","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wideband High Gain and Low RCS Fabry–Perot Antenna Using the Single Layer Partially Reflective Surface","authors":"Haoyong Ding,&nbsp;Ning Liu,&nbsp;Tao Jiang,&nbsp;Xianjun Sheng,&nbsp;Xiangyan Liu","doi":"10.1002/mop.70045","DOIUrl":"https://doi.org/10.1002/mop.70045","url":null,"abstract":"<div>\u0000 \u0000 <p>This letter presents a novel wideband high gain and low radar cross section reduction (RCS) Fabry–Perot (FP) antenna using a single layer partially reflective surface (PRS). Different from the traditional PRS unit, the proposed PRS unit can broaden the gain bandwidth and reduce the in-band RCS. The designed PRS distributes the radiated waves in-phase through the positive phase gradient compensation and weakens the reflection of the incident waves through the phase cancellation. Compared to the previous wideband low RCS FP antennas, we first achieved the 3 dB gain bandwidth covering the 10 dB impedance bandwidth. Both the simulation and measured results verify the performance of the proposed FP antenna. The results show that the proposed FP antenna has a 10 dB impedance bandwidth of 8.6–11.8 GHz (31.4%) and an RCS reduction bandwidth of 7.9–14.0 GHz (55.7%) under the normal incidence. The 3 dB gain bandwidth and the maximum realized gain are 8.3–12.0 GHz (36.5%) and 16.3 dBi.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-Q LNA With a VCO for Small Calibration Frequency Errors","authors":"Gyeong-Seok Lee,&nbsp;Phuoc B. T. Huynh,&nbsp;Jun-Young Park,&nbsp;Tae-Yeoul Yun","doi":"10.1002/mop.70057","DOIUrl":"https://doi.org/10.1002/mop.70057","url":null,"abstract":"<div>\u0000 \u0000 <p>A high-quality (Q) low-noise amplifier (LNA) combined with a voltage-controlled oscillator (VCO) is presented for small frequency errors in self-calibration. The proposed new double capacitive-cross-coupled structure controls negative impedance and thus, changes the working mode between the LNA and VCO with a small variation of parasitic capacitance, which results in a small calibration frequency error. High-Q and low-noise performances were theoretically analyzed and confirmed by simulation and measurement. The measured LNA operated from 2.2 to 2.44 GHz with a Q-factor of 34 while the frequency offset was less than 0.9%. A power gain of 27 dB, noise figure of 2.1 dB, and input third-order intercept point (IIP3) of −17 dBm were obtained while the power dissipations of the LNA and VCO modes were 10.2 and 4.7 mW from a 1.5-V supply, respectively.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stable and Periodic Soliton Molecules in the Fiber Ring Laser","authors":"Xiaoqiang Ban,&nbsp;Xiaohui Li,&nbsp;Qian Li,&nbsp;Hongyan Fu","doi":"10.1002/mop.70058","DOIUrl":"https://doi.org/10.1002/mop.70058","url":null,"abstract":"<div>\u0000 \u0000 <p>Stable and periodic soliton molecules (SMs) have been studied numerically by coupled nonlinear Schrodinger equations (CNLSEs). Split and formation processes of different-order SMs are observed by changing saturation power and filtering bandwidth. Bimodal pulses of SMs are in a transition state toward higher-order SMs. Short-period and long-period SMs are observed by adjusting saturation power. The research contributes to revealing SM dynamics, which has potential applications in encoding as well as optical storage.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Investigation of Over One Octave High-Coherence Supercontinuum Generation in Mid-Infrared Based on As2Se3 Tapered Photonic Crystal Fiber","authors":"Jin Wen,&nbsp;Huimin Yu,&nbsp;Qian Wang,&nbsp;Zhengwei Wu,&nbsp;Hui Zhang,&nbsp;Ying Zhang,&nbsp;Yu Pan","doi":"10.1002/mop.70056","DOIUrl":"https://doi.org/10.1002/mop.70056","url":null,"abstract":"<div>\u0000 \u0000 <p>The generation of high-coherence mid-infrared (MIR) supercontinuum (SC) spanning over one octave in As₂Se₃ tapered photonic crystal fiber (As₂Se₃-TPCF) is investigated through numerical simulations. Combined with the photonic crystal fiber and tapered fiber's structural characteristics, six As₂Se₃-TPCFs with different tapered structures are designed. The tapered regions are the power function and cosine tapered structures, respectively, while the taper waist and the untapered region have the same structure. Moreover, the nonlinear coefficient of the taper waist is 2.23825 W⁻¹m⁻¹ calculated by the finite element method (FEM), and the zero-dispersion wavelength (ZDW) in the down-taper moves with the increase of transmission distance, shifted from 5.2 to 2.4 μm. The temporal and spectral features of the MIR SC generated in As₂Se₃-TPCFs are numerically simulated by solving the generalized nonlinear Schrödinger equation (GNLSE), and the spectral broadening of As₂Se₃-TPCFs is mainly caused by self-phase modulation, Raman soliton self-frequency shift, and dispersive wave generation. Finally, six As₂Se₃-TPCFs with lengths of 0.1 m are pumped by short pulses with a center wavelength of 4.0 μm, pulse width of 40 fs, and pulse energy of 250 pJ, the results show that the linear tapered As₂Se₃-TPCF and the cosine tapered As₂Se₃-TPCF can achieve high-coherence MIR spectra spanning 1.6 octaves, with spectral widths from 2.1 to 6.4 μm.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 12","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}