Optics Communications最新文献_第10页

ROF-based antenna-PDM system employing DSM and DD-weight-pruning Volterra nonlinear equalization 基于 ROF 的天线波分复用系统，采用 DSM 和 DD 权重剪切 Volterra 非线性均衡技术

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-28 DOI: 10.1016/j.optcom.2024.131235

Tianqi Zheng, Jianjun Yu

{"title":"ROF-based antenna-PDM system employing DSM and DD-weight-pruning Volterra nonlinear equalization","authors":"Tianqi Zheng, Jianjun Yu","doi":"10.1016/j.optcom.2024.131235","DOIUrl":"10.1016/j.optcom.2024.131235","url":null,"abstract":"<div><div>The radio over fiber (ROF) system based on Delta-sigma modulation (DSM) can meet the requirements of the fronthaul system with its high signal fidelity and mature digital fronthaul interface specification. However, nonlinear impairments in ROF systems can seriously affect the performance of DSM signals. To reduce the impact of nonlinear effects on DSM signals with low complexity, we have designed a nonlinear equalizer based on the Volterra series. The complexity of the Volterra nonlinear equalizer (VNLE) is reduced through a weight pruning strategy. And by using directed decision instead of training sequences, we eliminate the redundancy introduced by VNLE while simultaneously ensuring its stability within the DSM system. Ultimately, we transmit one-bit single-carrier loaded DSM signals over 20 km of SMF-28 fiber and 3 m of wireless distance in an antenna polarization division multiplexing (APDM) intensity modulation and direct detection (IM/DD) system. For the first time, we add decision-directed weight-pruning Volterra nonlinear equalization (DD-PVNLE) algorithm in the APDM-IM/DD system to overcome the signal damage by the nonlinearity of the system. The BER of the Delta-sigma modulated on-off keying (DSM-OOK) signal reduces from 1 × 10<sup>−3</sup> to 1.1 × 10<sup>−4</sup>. The high-fidelity 1024QAM, 2048QAM, and 4096QAM are recovered successfully whose BERs below the soft decision threshold 2.4 × 10<sup>−2</sup> and hard decision threshold 3.8 × 10<sup>−3</sup> respectively.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131235"},"PeriodicalIF":2.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593712","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

A novel signal detection method for photon-counting communications with nonlinear distortion effects 具有非线性失真效应的新型光子计数通信信号检测方法

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-28 DOI: 10.1016/j.optcom.2024.131237

Chen Wang , Zhiyong Xu , Jingyuan Wang , Jianhua Li , Weifeng Mou , Huatao Zhu , Jiyong Zhao , Yang Su , Yimin Wang , Ailin Qi

{"title":"A novel signal detection method for photon-counting communications with nonlinear distortion effects","authors":"Chen Wang , Zhiyong Xu , Jingyuan Wang , Jianhua Li , Weifeng Mou , Huatao Zhu , Jiyong Zhao , Yang Su , Yimin Wang , Ailin Qi","doi":"10.1016/j.optcom.2024.131237","DOIUrl":"10.1016/j.optcom.2024.131237","url":null,"abstract":"<div><div>This paper proposes a method for estimating and detecting optical signals in practical photon-counting receivers. There are two important aspects of non-perfect photon-counting receivers, namely, (i) dead time which results in blocking loss, and (ii) non-photon-number-resolving, which leads to counting loss during the gate-ON interval. These factors introduce nonlinear distortion to the detected photon counts. The detected photon counts depend not only on the optical intensity but also on the signal waveform, and obey a Poisson binomial process. Using the discrete Fourier transform characteristic function (DFT-CF) method, we derive the probability mass function (PMF) of the detected photon counts. Furthermore, unlike conventional methods that assume an ideal rectangle wave, we propose a novel signal estimation and decision method applicable to arbitrary waveform. We demonstrate that the proposed method achieves superior error performance compared to conventional methods. The proposed algorithm has the potential to become an essential signal processing tool for photon-counting receivers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"574 ","pages":"Article 131237"},"PeriodicalIF":2.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572351","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

Double-slot micro-ring resonators with trapezoidal subwavelength grating as ultra-sensitive biochemical sensors 带梯形亚波长光栅的双槽微环谐振器用作超灵敏生化传感器

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-28 DOI: 10.1016/j.optcom.2024.131256

Yuanyuan Zhang , Chunlong Yu , Wenxin Wang , Daxing Li , Bin Zou , Guling Zhang , Shuai Feng

{"title":"Double-slot micro-ring resonators with trapezoidal subwavelength grating as ultra-sensitive biochemical sensors","authors":"Yuanyuan Zhang , Chunlong Yu , Wenxin Wang , Daxing Li , Bin Zou , Guling Zhang , Shuai Feng","doi":"10.1016/j.optcom.2024.131256","DOIUrl":"10.1016/j.optcom.2024.131256","url":null,"abstract":"<div><div>Silicon-based refractive index sensors are of significance in the detection of gases, biological substances and chemical compounds. Among these, optical microcavities can confine the optical field to the micrometre-scale region, and possess the advantages of high <em>Q</em> factor, small size and easy integration. In this paper, a trapezoidal subwavelength grating (SWG) is introduced into a slot micro-ring resonator, and the mode splitting is employed to enrich the supported standing wave modes and optimize the spatial profiles of the resonant modes. The modes’ <em>Q</em> factor is improved and the high sensitivity and low detection limit is achieved. The optimal trapezoidal subwavelength grating double slot micro-ring resonator (T-SWGDSMRR) structure is obtained by designing the structural parameters and analyzing their effects on the sensing performance parameters and spectral characteristics. The T-SWGDSMRR, designed for detecting the glucose solution, demonstrated a low detection limit of <span><math><mrow><mn>3.3</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>5</mn></mrow></msup></mrow></math></span> RIU and an ultra-high <em>Q</em> factor of up to 100825, accompanied by a refractive index sensitivity of 424 nm/RIU. Finally, a cascaded double micro-ring sensor is proposed using the vernier effect, through cascading the T-SWGDSMRR with a referential ring, the sensitivity is enhanced to 12828 nm/RIU, and the limit of detection is <span><math><mrow><mn>3.12</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>6</mn></mrow></msup></mrow></math></span> RIU.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131256"},"PeriodicalIF":2.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593718","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

An 8-channel narrow linewidth multi-wavelength laser hybrid integrated by photonic wire bonding structures for DWDM systems 采用光子线键合结构集成的 8 通道窄线宽多波长混合激光器，用于 DWDM 系统

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-26 DOI: 10.1016/j.optcom.2024.131252

Zeyu Gang , Shijian Guan , Jun Lu , Yunshan Zhang , Shenghong Xie , Yitong Liu , Zhenxing Sun , Rulei Xiao , Tao Fang , Xiangfei Chen

{"title":"An 8-channel narrow linewidth multi-wavelength laser hybrid integrated by photonic wire bonding structures for DWDM systems","authors":"Zeyu Gang , Shijian Guan , Jun Lu , Yunshan Zhang , Shenghong Xie , Yitong Liu , Zhenxing Sun , Rulei Xiao , Tao Fang , Xiangfei Chen","doi":"10.1016/j.optcom.2024.131252","DOIUrl":"10.1016/j.optcom.2024.131252","url":null,"abstract":"<div><div>An 8-channel monolithically integrated narrow linewidth multi-wavelength laser array (NL-MLA) combined with the commercial 8 × 1 planar lightwave circuit (PLC) coupler by the photonic wire bonding (PWB) technique is demonstrated in this paper. A distributed feedback (DFB) laser with the high-reflection and anti-reflection coatings (HR-AR) and the tapered asymmetric corrugation-pitch-modulated (TACPM) grating structure is proposed. The TACPM grating is achieved by the reconstruction equivalent chirp (REC) technique, which is low-cost and of high wavelength accuracy. According to the numerical simulation results, under the unavoidable impact of the facet phase of the HR end, the TACPM DFB laser suppresses the longitudinal spatial hole burning (LSHB) effect significantly, while having better single-mode performance and control of wavelength compared with the conventional HR-AR DFB laser. An 8-channel HR-AR TACPM DFB NL-MLA is fabricated with the 0.8 nm wavelength spacing design. The hybrid integration between the 8-channel NL-MLA and the PLC chip is achieved using the PWB technique. Both good single-mode performance and accurate wavelength interval of 0.8 nm can be obtained when all channels work simultaneously. The laser linewidth is below 273.8 kHz with good uniformity, and the relative intensity noise is under −159.6 dB/Hz for each channel.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131252"},"PeriodicalIF":2.2,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654586","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

Er3+ -doped oxyfluoroborosilicate glass ceramics with embedded CaF2 nanoparticles for 1.53 μm broad band applications 用于 1.53 μm 宽带应用的嵌入 CaF2 纳米粒子的掺杂 Er3+ 氧氟硼硅酸盐玻璃陶瓷

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-25 DOI: 10.1016/j.optcom.2024.131243

Bungala Chinna Jamalaiah

{"title":"Er3+ -doped oxyfluoroborosilicate glass ceramics with embedded CaF2 nanoparticles for 1.53 μm broad band applications","authors":"Bungala Chinna Jamalaiah","doi":"10.1016/j.optcom.2024.131243","DOIUrl":"10.1016/j.optcom.2024.131243","url":null,"abstract":"<div><div>The CaF<sub>2</sub> based oxyfluoroborosilicate glasses and glass ceramics doped with Er<sup>3+</sup> ions were prepared via melt quench process followed by heat treatment and characterized for 1.53 μm broadband applications. The optimized glass ceramic sample was obtained at 450<sup>o</sup>C/1h heat treatment. The Er<sup>3+</sup> concentration was optimized as 1.0 mol% for efficient emission at 460 nm excitation through concentration dependent luminescence analysis. The spectroscopic parameters such as Ω<sub>λ = 2,4,6</sub> parameters and the radiative parameters such as spontaneous transition probability rates (A<sub>R</sub>), branching ratios (β<sub>R</sub>) and decay times (τ<sub>R</sub>) were calculated applying the standard Judd-Ofelt theory. The effective bandwidth (Δλ<sub>eff</sub>), stimulated emission cross-section (σ<sub>e</sub>), gain bandwidth (σ<sub>e</sub> × Δλ<sub>eff</sub>), quantum efficiency (η) and figure of merit (σ<sub>e</sub> × τ<sub>R</sub>) were calculated as 25.78 nm, 13.42 × 10<sup>−21</sup> cm<sup>2</sup>, 3.46 × 10<sup>−26</sup> cm<sup>3</sup>, 82.83% and 5.32 × 10<sup>−23</sup> cm<sup>2</sup>s, respectively for the optimized glass ceramic sample. The exchange type of energy transfer among the excited Er<sup>3+</sup> ions results the quenching in luminescence and the non-exponentiality in decay curves. The systematic investigations carried out indicate that the glass ceramic obtained at 450<sup>o</sup>C/1h heat treatment was proficient for 1.53 μm broadband fiber lasers and optical amplifiers in S and C band communication window.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"574 ","pages":"Article 131243"},"PeriodicalIF":2.2,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554512","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

Photonic crystal fibers based on Dirac point-guiding 基于狄拉克点导引的光子晶体光纤

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-24 DOI: 10.1016/j.optcom.2024.131242

K. Xie , H. Jiang , H. Xia , Z. Hu , J. Zhang , Q. Mao

引用次数: 0

A low heat release cladding pump coupler 低热释放覆层泵耦合器

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-24 DOI: 10.1016/j.optcom.2024.131248

Hongyan Shi , Lu Dai , Qinghua Lv , Lei Shen , Xinfang Zhao , Hui Lv

{"title":"A low heat release cladding pump coupler","authors":"Hongyan Shi , Lu Dai , Qinghua Lv , Lei Shen , Xinfang Zhao , Hui Lv","doi":"10.1016/j.optcom.2024.131248","DOIUrl":"10.1016/j.optcom.2024.131248","url":null,"abstract":"<div><div>Few-mode erbium-doped fiber amplifiers (FM-EDFAs) have opened up the possibility of realizing the next generation of high-capacity, high-rate communication systems. However, the leakage of pump light during continuous operation of the FM-EDFA is likely to cause the temperature of the cladding pump coupler to be too high and thus destabilize the amplifier. In this work, a low heat release cladding pump coupler was designed and the corresponding FM-EDFA was constructed. The cladding pump coupler in the 8 h of continuous operation of the FM-EDFA is at 27.8 °C for maximum, 23.7 °C for minimum, and 26 °C for average temperatures, respectively, which are in a low-temperature safe transmission state. The FM-EDFA performance test was performed on this basis, and the results show that when the input pump power is 7 W, the maximum gain fluctuation of each mode of FM-EDFA at 1550 nm in 0∼8 h is only 1.5 dB, the gain of all modes is greater than 23 dB and the differential mode gain (DMG) is less than 2 dB. In addition, the FM-EDFA still has good performance in the C-band after 8 h of continuous operation. The gain for all modes is greater than 21 dB, DMG is less than 2 dB, and wavelength flatness is 3.6 dB. The low heat release cladding pump coupler is conducive to the stable amplification transmission of FM-EDFA, which is of great significance to achieving the upgrading and expansion of the communication system.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"574 ","pages":"Article 131248"},"PeriodicalIF":2.2,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554506","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

Desensitization design method of an off-axis three-mirror anastigmatic optical system based on the nodal aberration theory 基于节点像差理论的离轴三镜面偏斜光学系统的脱敏设计方法

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-24 DOI: 10.1016/j.optcom.2024.131228

Yang Wang , Rui Chang , Zhiyuan Gu , Bin Yang , Lei Zhang

引用次数: 0

Mixed precision quantization of silicon optical neural network chip 硅光学神经网络芯片的混合精度量化

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-23 DOI: 10.1016/j.optcom.2024.131231

Ye Zhang , Ruiting Wang , Yejin Zhang , Jiaoqing Pan

引用次数: 0

Deep learning techniques for quality of transmission estimation in optical networks 用于光网络传输质量估计的深度学习技术

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-23 DOI: 10.1016/j.optcom.2024.131223

Shakrajit Sahu, J. Christopher Clement

{"title":"Deep learning techniques for quality of transmission estimation in optical networks","authors":"Shakrajit Sahu, J. Christopher Clement","doi":"10.1016/j.optcom.2024.131223","DOIUrl":"10.1016/j.optcom.2024.131223","url":null,"abstract":"<div><div>A large body of research has recently examined the estimation of the quality of transmission (QoT) in optical networks with deep learning. This paper discusses a lightpath’s quality of transmission to design fiber-optic communication and networks using deep learning algorithms. We need different major estimation parameters for advanced optical fiber communication and networks, i.e., modulation formats, baud rate, and code rate. Currently, the quality of transmission for unspecified optical paths depends on different estimation techniques i.e., (1) analytical models estimating physical layer impairments (PLIs) and (2) margined formulas. This paper focuses on deep-learning techniques that can be applied to optimization and complex systems. The deep learning algorithms contain different classifiers that can simulate results and estimate the bit-error rate, and signal-to-noise ratio of unspecified optical paths with threshold values, traffic volume, and modulation format. We must train and test the datasets for various classifiers, and classification features using Korean network topology. The classifier accuracy and Area Under the ROC Curve (AUC) simulation results are carried out using MATLAB.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"574 ","pages":"Article 131223"},"PeriodicalIF":2.2,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554508","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