Optics Communications最新文献_第3页

Observation of widely separated soliton molecules in a mode-locked Yb-doped fiber laser operating with net anomalous dispersion 在以净反常色散工作的模式锁定掺镱光纤激光器中观测到相距甚远的孤子分子

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-22 DOI: 10.1016/j.optcom.2024.131217

{"title":"Observation of widely separated soliton molecules in a mode-locked Yb-doped fiber laser operating with net anomalous dispersion","authors":"","doi":"10.1016/j.optcom.2024.131217","DOIUrl":"10.1016/j.optcom.2024.131217","url":null,"abstract":"<div><div>This paper investigates the generation and characterization of soliton molecules (SM) in a semiconductor saturable absorber mirror (SESAM) mode-locked Yb-doped fiber laser with a linear cavity. By adjusting the pump power, both single-pulsing (SP) and double-pulsing (DP) states can be achieved. The observed soliton molecules are highly stable, with minimal temporal jitter despite being separated by <span><math><mrow><mn>1</mn><mo>.</mo><mn>56</mn><mspace></mspace><mi>ns</mi></mrow></math></span>. While SM have been observed in many different cavities this is one of the few reports in a Fabry–Perot cavity rather than a ring cavity and again most previous observations of soliton molecules having been in the anomalous dispersion regime. This configuration thus provides detailed and valuable insights into the behavior of SM, shedding light on their formation, stability, and dynamics. This study contributes to understanding long range soliton interactions in fiber lasers, with potential implications for applications such as multi-bit transmission, bit storage, and pump–probe experiments to study the dynamics of chemical reactions.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554511","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

Optical orthogonal frequency division multiplexing with differential index modulation 采用差分索引调制的光正交频分复用技术

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-22 DOI: 10.1016/j.optcom.2024.131226

{"title":"Optical orthogonal frequency division multiplexing with differential index modulation","authors":"","doi":"10.1016/j.optcom.2024.131226","DOIUrl":"10.1016/j.optcom.2024.131226","url":null,"abstract":"<div><div>This paper proposes a differential index modulation (DIM) scheme to address the complex channel estimation challenges in optical orthogonal frequency division multiplexing with index modulation (OOFDM-IM). The main idea of the DIM scheme is to design a time-frequency dispersive matrix with unitary characteristics and perform index mapping based on the Lemer code principles. By applying differential operations, the DIM scheme enables decoding at the receiver without requiring channel estimation. The paper provides a detailed explanation of the design principles and theoretical bit error rate (BER) of the proposed scheme. Simulations based on the exponential Weibull atmospheric turbulence channel model are conducted to compare the DIM scheme with the existing OOFDM-IM scheme. Additionally, a carefully designed proof-of-concept experiment is performed to further validate the scheme’s effectiveness and feasibility. Both simulation and experimental results demonstrate that, compared to OOFDM-IM, the proposed scheme can entirely avoid complex channel estimation with a maximum signal-to-noise ratio (SNR) loss of no more than 4 dB, even under various turbulence intensities and higher-order modulation scenarios. This provides a valuable reference for OOFDM-IM in complex environments or where channel estimation is challenging.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554507","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

Modulating nonreciprocal transmission in levitated magnomechanical systems 调节悬浮磁力机械系统中的非互惠传输

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-21 DOI: 10.1016/j.optcom.2024.131212

引用次数: 0

Simultaneous lightwave information and power transfer for NLOS ultraviolet communications under different weather conditions 不同天气条件下 NLOS 紫外线通信的同步光波信息和功率传输

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-21 DOI: 10.1016/j.optcom.2024.131215

{"title":"Simultaneous lightwave information and power transfer for NLOS ultraviolet communications under different weather conditions","authors":"","doi":"10.1016/j.optcom.2024.131215","DOIUrl":"10.1016/j.optcom.2024.131215","url":null,"abstract":"<div><div>In this work, a power allocation scheme for ultraviolet communication (UVC) with simultaneous lightwave information and power transfer (SLIPT) is proposed. Based on the non-line-of-sight (NLOS) single scattering channel model, the path loss and bit error rate (BER) performance of the UVC system with different geometrical parameters are analyzed. The effects of three types of weather, light rain, fine weather and severe fog conditions are considered. It is proved that the path loss is minimized on foggy days with minimum BER, followed by sunny days. The proposed SLIPT approach that the receiving energy is in turn divided into two parts, one for energy harvesting (EH) and the other for information decoding (ID). The system is designed to optimize energy harvesting for autonomous power supply, while ensuring a specified BER threshold and maintaining spectral efficiency. The effects of three types of weather on the SLIPT system are further investigated. It is demonstrated that under shorter communication distance(<em>r</em>), smaller elevation angle of receiving terminal (<em>β</em><sub><em>R</em></sub>), larger field of view (FoV) and lower spectral efficiency(<em>η</em>) conditions, a higher percentage of energy is allocated for EH, with foggy days being the most favorable. The extreme geometric parameters of rainy condition can lead to the inability of communication, which needs to be limited to r ≤ 10 m, elevation angle of Rx ≤ 6°, FOV ≥100°, spectral efficiency ≤3, under the preset parameters in this paper.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525959","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

Harmonic analysis of phase-sensitive optical time-domain reflectometer 相敏光学时域反射仪的谐波分析

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-21 DOI: 10.1016/j.optcom.2024.131230

{"title":"Harmonic analysis of phase-sensitive optical time-domain reflectometer","authors":"","doi":"10.1016/j.optcom.2024.131230","DOIUrl":"10.1016/j.optcom.2024.131230","url":null,"abstract":"<div><div>This study innovatively proposes a method of using harmonics to mitigate the influence of fading noise in Phase-Sensitive Optical Time-Domain Reflectometer (Φ-OTDR). Numerical modeling was conducted to investigate the behavior of the Φ-OTDR. A section optical fiber is coiled around a PZT (piezoelectric transducer). By applying a signal to the PZT, it emulates an external vibration. The response of the simulated vibration was extracted using phase demodulation algorithm. In the response spectrum of the vibration, the fundamental frequency may be submerged because of the fading noise, causing the useful information to be obscured. However, the region impacted by fading noise in the fundamental frequency is unaffected in certain harmonic components. Thus, information from the harmonics can be used to compensate for the missing information in the fundamental frequency. By analyzing multiple harmonic components, the accuracy of vibration detection and localization can be improved. Experiment was performed to corroborate the findings, and the results demonstrated good consistency with the simulated data. Both the simulation and the experiment proved that considering harmonics can enhance the measurement accuracy of Φ-OTDR. This discovery provides new insights and methods for the application of Φ-OTDR.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Secure and covert communication strategy of UAV based on hybrid RF/FSO system 基于 RF/FSO 混合系统的无人飞行器安全隐蔽通信策略

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-21 DOI: 10.1016/j.optcom.2024.131234

{"title":"Secure and covert communication strategy of UAV based on hybrid RF/FSO system","authors":"","doi":"10.1016/j.optcom.2024.131234","DOIUrl":"10.1016/j.optcom.2024.131234","url":null,"abstract":"<div><div>The hybrid radio frequency (RF)/free-space optical (FSO) system can improve communication security by using complimentary characteristics and mitigating the risks of RF links being susceptible to co-channel interference (CCI) and malicious eavesdropping. We investigate the secure and covert communication performance of unmanned aerial vehicles (UAVs) equipped with a hybrid RF/FSO system. In terms of secure communication, UAVs employ the strategy of transmitting private data concurrently through RF and FSO links, considering two modes based on active eavesdropping by a malicious user. Closed-form expressions for the secrecy outage probability (SOP) and effective secrecy throughput (EST) are derived. With respect to covert communication, the communication strategy is to utilize the RF link to generate interfering signals, thus aiding the FSO signals in accomplishing covert communication. We formulate an optimization problem that maximizes the EST while considering transmit power and user-acceptable detection error probability. A two-stage gradient-based iterative solution algorithm is proposed. The numerical results demonstrate the effectiveness of the proposed secure and covert communication strategy based on the hybrid RF/FSO system, which is expected to enhance the communication security of UAVs in the RF-challenged environment.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525814","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 10 GHz high-frequency coupled optoelectronic oscillator for RF/FSO fusion transmission in smoke channels 用于烟道射频/FSO 融合传输的 10 GHz 高频耦合光电振荡器

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-21 DOI: 10.1016/j.optcom.2024.131236

{"title":"A 10 GHz high-frequency coupled optoelectronic oscillator for RF/FSO fusion transmission in smoke channels","authors":"","doi":"10.1016/j.optcom.2024.131236","DOIUrl":"10.1016/j.optcom.2024.131236","url":null,"abstract":"<div><div>We proposes and experimentally demonstrates a RF/FSO fusion transmission system under smoke channel. First, an RF and laser-integrated communications payload is designed for RF/FSO fusion links to achieve mutual information backup for both FSO and RF links. Coupled optoelectronic oscillator (COEO) can generate 10.0 GHz low-jitter optical pulses and 10.0 GHz low-phase noise RF signals simultaneously. The measured RF side-mode rejection ratio is 52.16 dB, and the phase noise at 10 kHz offset is about −117.6 dBc/Hz. The experimental results show that COEO has good compatibility in RF/FSO fusion communication and effectively solves the problem of RF/FSO link compatible sharing. Then, we established a RF/FSO fusion transmission system based on a COEO. Taking the complexity of the smoke channel, the RF/FSO link is not switched to achieve simultaneous transmission communication without interruption. The power jitter, signal-to-noise ratio, and bit error rate of RF/FSO links are investigated for different smoke visibility and is further investigated. The experimental results indicate, the fusion RF/FSO system is more reliable under extremely dense smoke conditions based on a COEO, which is significant for the future development of reliable space high-speed information transmission and networking.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525815","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

Bi-directional SMF-NDF-optical/5G NR wireless converged systems 双向 SMF-NDF- 光/5G NR 无线融合系统

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-20 DOI: 10.1016/j.optcom.2024.131232

{"title":"Bi-directional SMF-NDF-optical/5G NR wireless converged systems","authors":"","doi":"10.1016/j.optcom.2024.131232","DOIUrl":"10.1016/j.optcom.2024.131232","url":null,"abstract":"<div><div>This study presents the transmission of fifth-generation (5G) new radio (NR) signals over bi-directional single-mode fiber (SMF)-negative dispersion fiber (NDF)-optical/5G NR wireless converged systems, using two cascaded reflective semiconductor optical amplifiers (RSOAs). Downstream transmission of 5G NR 16-quadrature amplitude modulation (QAM) signals achieved an aggregate net bit rate of 228.037 Gb/s, comprising 59.813, 74.766, and 93.458 Gb/s at 150, 250, and 325 GHz, respectively. The system achieved a low bit error rate (BER) and clear constellation patterns. However, systems without NDF exceed the forward error correction 7% threshold, indicating the importance of NDF in compensating for fiber dispersion. Moreover, for upstream transmission, two cascaded RSOAs are used to transmit 5G 16-QAM-orthogonal frequency division multiplexing signals, achieving a total data rate of 40 Gb/s. The use of two cascaded RSOAs in the system significantly improved upstream performance, resulting in low BERs and clear constellation patterns. This system not only achieved high data rates but also extended transmission coverage to support the deployment of advanced 5G NR applications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525813","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

Low complexity and receiver IQ skew tolerant timing recovery and equalization scheme under baud-rate sampling short-reach coherent optical interconnection 波特率采样短程相干光互联下的低复杂度和接收器 IQ 偏移容错定时恢复和均衡方案

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-18 DOI: 10.1016/j.optcom.2024.131207

{"title":"Low complexity and receiver IQ skew tolerant timing recovery and equalization scheme under baud-rate sampling short-reach coherent optical interconnection","authors":"","doi":"10.1016/j.optcom.2024.131207","DOIUrl":"10.1016/j.optcom.2024.131207","url":null,"abstract":"<div><div>Coherent detection with high spectrum and oversampled digital signal processing (DSP) has been widely used in long-haul and metro optical communication, and power consumption is one of the most challenge for its application in energy-sensitive short reach optical connections, such as hyper-scale and ultra-capacity datacenter net works. With negligible chromatic dispersion (CD) and polarization mode dispersion (PMD) in short-reach interconnects, a low complexity and robust timing recovery and equalization scheme with baud-rate sampling is proposed and demonstrated experimentally, which aims to achieve a power efficient DSP. Instead of oversampled DSP with fully-connected butterfly equalization structure, baud-rate sampling DSP with one-tap connected butterfly structure must become the most power-efficient solution for short-reach optical interconnects, because spectrum aliasing and convolutional polarization mixing caused by CD and PMD can be ignored. Compared to conventional baud-rate and oversampled DSP scheme, the experimental results further confirm the advantage of the proposed scheme in BER performance and IQ skew tolerance. Additionally, the proposed scheme with baud-rate sampling and a simplified equalization structure can also save around 75% of power consumption with a negligible performance cost, compared to oversample DSP scheme.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525960","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

The symmetry change of the transverse modes in ring-LD end-pumped Nd:YVO4 laser with an étalon 环形激光二极管（ring-LD）末端泵浦 Nd:YVO4 激光器横向模式的对称性变化

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-10-18 DOI: 10.1016/j.optcom.2024.131205

引用次数: 0