Optics Communications最新文献_第3页

Experimental verification of multi-dimensional geometric shaping in OFDM-VLC system

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-23 DOI: 10.1016/j.optcom.2025.131792

Ruoling Song , Jie Ma , Jia Lu , Jianfei Liu , Xiangye Zeng , Mingming Luo

{"title":"Experimental verification of multi-dimensional geometric shaping in OFDM-VLC system","authors":"Ruoling Song , Jie Ma , Jia Lu , Jianfei Liu , Xiangye Zeng , Mingming Luo","doi":"10.1016/j.optcom.2025.131792","DOIUrl":"10.1016/j.optcom.2025.131792","url":null,"abstract":"<div><div>In this paper, an innovative four-dimensional set-partitioning geometric shaping (4D-SP-GS) modulation format is proposed and experimentally verified in orthogonal frequency division multiplexing based visible light communication (OFDM-VLC). The method optimizes the position of the constellation points by using the quasi-polarization multiplexing. The perfect combination of SP and polarization ring switching (PRS) achieves flexible grouping and ring switching between constellation points, and further expand the minimum Euclidean distance (MED) of constellation points. Orthant symmetry (OS) reduces the complexity of constellation point mapping in 4D space. The entropy of the 4D-SP-GS can reach 8 bit/symbol. The simple real-valued precoding decreases the peak-to-average power ratio (PAPR) of OFDM and equalizes signal-to-noise ratio (SNR) distribution among subcarriers. Compared with traditional polarization-multiplexed 16 quadrature amplitude modulation (PM-16QAM), 4D geometric shell mapping (4D-GSS), 4D circular 256QAM (4D-c256QAM) and 4D-256PRS, experimental results show that the 4D-SP-GS can achieve a maximum operating range improvement of 50/45/30/8 mV when volts-peak-to-peak (VPP) is 60 mV–110 mV and 130/75/50/25 MS/s sampling rate improvement when the bit error rate (BER) satisfies 3.8 × 10<sup>−3</sup>, thus effectively improve the anti-nonlinearity performance of the system.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131792"},"PeriodicalIF":2.2,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Polarization independent metal–insulator–metal layered wide-band absorber with large angular stability for radar cross section reduction application

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-23 DOI: 10.1016/j.optcom.2025.131751

Sivanantham Arumugam, Srinivasa Rao Inabathini

{"title":"Polarization independent metal–insulator–metal layered wide-band absorber with large angular stability for radar cross section reduction application","authors":"Sivanantham Arumugam, Srinivasa Rao Inabathini","doi":"10.1016/j.optcom.2025.131751","DOIUrl":"10.1016/j.optcom.2025.131751","url":null,"abstract":"<div><div>A wide-band polarization independent microwave absorber has been proposed using two cross dipole resonators and square nodes with an unit cell size of <span><math><mrow><mn>0</mn><mo>.</mo><mn>18</mn><msub><mrow><mi>λ</mi></mrow><mrow><mi>L</mi></mrow></msub><mo>×</mo><mn>0</mn><mo>.</mo><mn>18</mn><msub><mrow><mi>λ</mi></mrow><mrow><mi>L</mi></mrow></msub></mrow></math></span>, where <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span> represents the wavelength at the lowest operating frequency. The cross-dipole based resonating patterns with four nodes are designed on the FR4 dielectric layer. Lumped resistors are employed on the top layer to achieve the wide bandwidth. The bottom-most layer of the proposed absorber structure is made of copper. An air-spacer layer has been deployed between the substrate and the metallic ground layer to extend the low frequency absorption. The fractional bandwidth of the absorber is 93% with the absorption greater than 90% in the operating frequency range of 2.76 GHz-7.56 GHz. The profile of the proposed absorber is 0.08<span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span>. The unique characteristic of the proposed absorber structure is that the polarization conversion ratio of the structure is less than 0.1. The absorptivity of the proposed structure is more than 80% for a wide range of incident angles up to 60°. The absorption characteristics are found to be stable for both transverse electric and transverse magnetic polarized incident waves under normal incidence. Further, the mono-static radar cross section reduction of the proposed absorber structure has been verified to be greater than 20 <span><math><mrow><mtext>dB</mtext><mspace></mspace><mtext>m</mtext><msup><mrow></mrow><mrow><mi>2</mi></mrow></msup></mrow></math></span> in the operating bandwidth.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131751"},"PeriodicalIF":2.2,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Wideband continuously-tuned matrix DFB laser array assisted with enhanced self-heating effect based on REC technique

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-23 DOI: 10.1016/j.optcom.2025.131759

Zizhuo Li , Yaqiang Fan , Zhenxing Sun , Wentao Sun , Yuan Lv , Wei Yuan , Zijiang Yang , Jiale Xu , Pan Dai , Yan Wang , Pengfei Xu , Xiangfei Chen

{"title":"Wideband continuously-tuned matrix DFB laser array assisted with enhanced self-heating effect based on REC technique","authors":"Zizhuo Li , Yaqiang Fan , Zhenxing Sun , Wentao Sun , Yuan Lv , Wei Yuan , Zijiang Yang , Jiale Xu , Pan Dai , Yan Wang , Pengfei Xu , Xiangfei Chen","doi":"10.1016/j.optcom.2025.131759","DOIUrl":"10.1016/j.optcom.2025.131759","url":null,"abstract":"<div><div>In this letter, we propose and experimentally demonstrate a wideband continuously-tuned matrix distributed feedback (DFB) laser array. This DFB laser array is developed based on the reconstruction-equivalent-chirp (REC) technique and has an enhanced self-heating effect. The laser array is made up of 24 DFB lasers that are arranged in an 8 × 3 matrix interleaving pattern. Moreover, it integrates a three-level cascaded Y-branch optical combiners and an active semiconductor optical amplifier (SOA) on a single chip. In order to achieve continuous wavelength tuning, we increase the resistance of the laser to enhance the self-heating effect of the laser, which in turn expands the current-tuned wavelength range of the laser. The tunable 8 × 3 REC-DFB laser array employs a current tuning method. Consequently, in comparison with the conventional wavelength tuning methods relying on thermoelectric cooler (TEC), it can reach lower power consumption and faster continuous wavelength tuning. The proposed laser array is applicable to a 49 nm continuous wavelength tuning situation. Its output power is more than 38 mW, and all side mode suppression ratios (SMSRs) are higher than 40 dB. This research provides a new path for realizing semiconductor lasers with low power consumption and a wide tuning range.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131759"},"PeriodicalIF":2.2,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Wide-field-of-view rapid acquisition and tracking control for portable optical communication systems

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-22 DOI: 10.1016/j.optcom.2025.131790

Xuan Wang , Xiangsheng Meng , Junfeng Han , Chen Wang , Yinghong He

{"title":"Wide-field-of-view rapid acquisition and tracking control for portable optical communication systems","authors":"Xuan Wang , Xiangsheng Meng , Junfeng Han , Chen Wang , Yinghong He","doi":"10.1016/j.optcom.2025.131790","DOIUrl":"10.1016/j.optcom.2025.131790","url":null,"abstract":"<div><div>Optical communication technology has been extensively applied in long-distance space communication due to its numerous advantages. With the advancement of CubeSat technology, portable optical communication systems have also emerged. When applied to ground-based scenarios, this technology can effectively support emergency high-speed communication in environments where radio frequencies are unavailable or restricted. However, its primary limitation lies in the rapid acquisition of wide-field-of-view laser links. To address this challenge, we propose a compact coaxial transceiver design for a portable optical communication terminal, utilizing Micro-Electro-Mechanical Systems (MEMS) micromirrors and a Quadrant Detector (QD). Furthermore, we developed a QD spot position deviation rapid acquisition algorithm for quickly determining the laser spot position on the QD. This represents a novel and efficient technique for achieving fast and precise large-area acquisition and tracking control. Experimental results demonstrate that the proposed portable optical communication terminal is capable of rapid deployment and efficient laser link acquisition, completing acquisition within 83 s over a distance of 506 m, within a 60° × 40° field of view. These findings mark a significant advancement toward the practical application of ground-based portable optical communication technology.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131790"},"PeriodicalIF":2.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Evolution of beam spatial characteristics in high-power Yb:YAG Innoslab amplifier

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-22 DOI: 10.1016/j.optcom.2025.131794

Yuguang Huang , Jie Guo , Jinfeng Li , Zichen Gao , Xiaoyan Liang

引用次数: 0

Depth estimation via shift-photography in Alvarez Lens imaging systems

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-22 DOI: 10.1016/j.optcom.2025.131760

Jiapu Yan, Menghao Li, Tingting Jiang, Huajun Feng, Zhihai Xu, Qi Li, Yueting Chen

引用次数: 0

Performance evaluation of large-aperture highly reflective mirrors for high-power laser applications with reflectance mapping

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-21 DOI: 10.1016/j.optcom.2025.131786

Yanling Han , Bincheng Li , Hao Cui , Jing Wang

{"title":"Performance evaluation of large-aperture highly reflective mirrors for high-power laser applications with reflectance mapping","authors":"Yanling Han , Bincheng Li , Hao Cui , Jing Wang","doi":"10.1016/j.optcom.2025.131786","DOIUrl":"10.1016/j.optcom.2025.131786","url":null,"abstract":"<div><div>The performance evaluation of large-aperture highly reflective (HR) mirrors, which are widely used in high-power laser systems, is essential for the long-term operation of these laser systems. In this study, the development of the HR mirror's reflectance distribution, which is measured via cavity ring-down (CRD) technique, to be a general quality control tool for the large-aperture HR mirrors is attempted. Various parameters and data analysis methods are defined and developed to evaluate the performance of the large-aperture HR mirrors. Specifically, we introduced the maximum-probability reflectance (<em>R</em><sub><em>max-p</em></sub>), which describes the reflectance distribution excluding the influence of defects, and the maximum-residual-probability reflectance (<em>R</em><sub><em>max-r-p</em></sub>), which characterizes the reflectance distribution affected by defects. Additionally, we discussed the full-width at half-maximum (FWHM) of the residual reflectance distribution, which quantifies the variation in reflectance due to defects, as well as the reflectance difference (Δ<em>R</em>) defined as the difference between <em>R</em><sub><em>max-p</em></sub> and <em>R</em><sub><em>max-r-p</em></sub>. These parameters collectively provide a comprehensive assessment of the HR mirrors' performance. The developed parameters and data analysis methods were applied to the performance evaluation of 68 HR mirrors with diameters ranging from 200 mm to 400 mm, with 0- or 45-degree angle of incidence (AOI) and fused silica or sapphire substrates. Statistical analysis revealed that HR mirrors with a 0-degree AOI have higher reflectance than that with a 45-degree AOI, while HR mirrors deposited on fused silica substrates showed slightly better reflection performance than that deposited on sapphire substrates. The statistical results demonstrated that the proposed parameters and data analysis methods are helpful to evaluate the performance of large-aperture HR mirrors.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131786"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Efficient third harmonic generation based on the spatial distribution characteristics of the second harmonic generation efficiency

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-21 DOI: 10.1016/j.optcom.2025.131785

Mingheng Yuan , Yuan Sui , Xiaopeng Liu , Yuan Wu , Wen Huang , Guangyin Zhang , Zhenao Bai , Zhongwei Fan

{"title":"Efficient third harmonic generation based on the spatial distribution characteristics of the second harmonic generation efficiency","authors":"Mingheng Yuan , Yuan Sui , Xiaopeng Liu , Yuan Wu , Wen Huang , Guangyin Zhang , Zhenao Bai , Zhongwei Fan","doi":"10.1016/j.optcom.2025.131785","DOIUrl":"10.1016/j.optcom.2025.131785","url":null,"abstract":"<div><div>Picosecond ultraviolet lasers are extensively utilized in precision manufacturing and material processing, where system designs prioritize longevity and stability. However, the emphasis on durability and simplicity—exemplified by extra-cavity configurations with LBO crystals—often compromises the overall conversion efficiency, underscoring the need for further optimization. We developed a simulation model based on the spatial distribution characteristics of second harmonic generation (SHG) efficiency to guide the design of an efficient third harmonic generation (THG) system. We developed a simulation model that reveals the functional relationship between the fundamental peak power and the optimal beam diameter. Based on the simulation results, we optimized the design of a highly efficient third harmonic generation system. Consequently, we achieved a conversion efficiency of <span><math><mrow><mn>17.89</mn><mo>%</mo></mrow></math></span> for wavelength conversion from <span><math><mrow><mn>1030</mn><mi>n</mi><mi>m</mi></mrow></math></span> to <span><math><mrow><mn>343</mn><mi>n</mi><mi>m</mi></mrow></math></span>. The design integrated disk regenerative amplification and single-crystal fiber technologies for the first time, delivering an ultraviolet output with an average power of <span><math><mrow><mn>30.2</mn><mi>W</mi></mrow></math></span>. This method advances the third harmonic generation efficiency and offers new pathways for compact, high-performance picosecond ultraviolet laser development in scientific and industrial domains.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131785"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Three dimensional amplitude modulation and demodulation technology based on independent dual sideband optical communication system

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-21 DOI: 10.1016/j.optcom.2025.131791

Yilin Chen, Zheng Hu, Jiabao Zhao, Feihan Li, Hangzhi Zhu, Jiangnan Xiao

{"title":"Three dimensional amplitude modulation and demodulation technology based on independent dual sideband optical communication system","authors":"Yilin Chen, Zheng Hu, Jiabao Zhao, Feihan Li, Hangzhi Zhu, Jiangnan Xiao","doi":"10.1016/j.optcom.2025.131791","DOIUrl":"10.1016/j.optcom.2025.131791","url":null,"abstract":"<div><div>This article proposes the use of Three Dimensional Amplitude Modulation (TDAM) and demodulation techniques in independent dual sideband systems without increasing the modulation order of the carrier amplitude. This system generates two columns of random binary sequences digitally. One is modulated with 3D-8QAM at −13 GHz, and the other is modulated with 3D-8QAM at 29 GHz with half amplitude. Then, the three dimensions x, y, and z of the three-dimensional signal are modulated onto the carriers <span><math><mrow><mi>cos</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow></mrow></math></span>, <span><math><mrow><mi>sin</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow></mrow></math></span> and <span><math><mrow><mi>cos</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow><mo>∗</mo><mi>sin</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow></mrow></math></span>, respectively, so that the left and right independent sidebands are superimposed in the IQ modulator. At the receiving end, two independent sideband signals are received through a single photodiode (PD). After PD square law conversion, a three-dimensional 8TDAM signal is synthesized, and then separated and demodulated by a digital signal processing (DSP) to obtain two separate three-dimensional signals. The simulation results show that the system can successfully achieve 8 Gbaud independent 8TDAM signal 20 km SSMF transmission, with an HD-FEC threshold of 3.8 × 10<sup>−3</sup> and an error rate of 7 %. The system has demonstrated that three-dimensional signals can be transmitted independently in both sidebands, greatly simplifying the system structure, further reducing implementation costs, and improving spectral efficiency. The highest spectral efficiency can reach 3.692bit/s/Hz.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131791"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Three-dimensional cavity structure-assisted gold nanoparticles for surface-enhanced Raman scattering applications

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-21 DOI: 10.1016/j.optcom.2025.131784

Yu Wang , Hongyan Zhao , Guangqiang Liu, Cuixia Bi, Sujuan Feng, Tong Shi, Jiacheng Li, Hao Wang

{"title":"Three-dimensional cavity structure-assisted gold nanoparticles for surface-enhanced Raman scattering applications","authors":"Yu Wang , Hongyan Zhao , Guangqiang Liu, Cuixia Bi, Sujuan Feng, Tong Shi, Jiacheng Li, Hao Wang","doi":"10.1016/j.optcom.2025.131784","DOIUrl":"10.1016/j.optcom.2025.131784","url":null,"abstract":"<div><div>The effect of surface-enhanced Raman scattering (SERS) depends on the structure of the SERS substrate, and the combination of special substrate structure and Au/Ag nanoparticles is an effective means for SERS. In this study, the bottom funnel head flower-shaped collapse array structure with unique morphology is prepared by improved anodic aluminum oxide (AAO) method, and gold nanoparticle (AuNPs) layers are embedded in the structure to synthesize composite substrates for high-performance Raman signal enhancement. The experimental conditions such as anodic oxidation time, reaming time, gold plating time and annealing time are discussed in detail with 4-aminothiophenol (4-ATP) as probe molecule, the ultra-low concentration detection with molecular concentration of 10<sup>−13</sup> mol/L can be realized. At the same time, the concentration and signal intensity shows a good linear relationship, and the field enhancement factor is as high as 1.24 × 10<sup>6</sup>. The structure of the substrate shows high repeatability, high sensitivity and high uniformity, which has a broad application prospect in the plasma devices based on anodic alumina.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131784"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0