Optics Communications最新文献

英文中文

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 Q2 OPTICS

Optics Communications

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

Siyu Gong , Yanfu Yang , Qian Xiang , Linsheng Fan , Qun Zhang , Tianjian Zuo

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.

采用高频谱和过采样数字信号处理（DSP）的相干检测已广泛应用于长途和城域光通信，而功耗是其应用于超大规模和超大容量数据中心网络等对能量敏感的短距离光连接所面临的最大挑战之一。在短距离互连中色度色散（CD）和偏振模色散（PMD）可忽略不计的情况下，提出了一种低复杂度、稳健的时序恢复和均衡方案，并通过波特率采样进行了实验演示，旨在实现高能效的 DSP。与采用全连接蝶形均衡结构的过采样 DSP 相比，采用单抽头连接蝶形结构的波特率采样 DSP 必将成为短距离光互连中最节能的解决方案，因为它可以忽略 CD 和 PMD 引起的频谱混叠和卷积偏振混合。与传统的波特率和过采样 DSP 方案相比，实验结果进一步证实了拟议方案在误码率性能和 IQ 偏移容限方面的优势。此外，与过采样 DSP 方案相比，采用波特率采样和简化均衡结构的拟议方案还能节省约 75% 的功耗，性能成本几乎可以忽略不计。

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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 Q2 OPTICS

Optics Communications

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

Jing Wang , Bingxuan Li , Zhanglang Lin , Wenbin Liao , Ge Zhang

A straightforward method for converting the symmetry of a diode end-pumped laser with an annular pump beam has been proposed. By introducing an étalon into the cavity, we observed a change in the spatial symmetry of the transverse mode profile from rectangular to cylindrical both in degenerate and non-degenerate ranges. A simulation of the transmittance distribution of the beam through the étalon after filtering is given. Our experimental results indicate that this method of altering the symmetry maintains relative stability during the tilting of the étalon.

我们提出了一种转换环形泵浦光束二极管端泵浦激光器对称性的直接方法。通过在腔体中引入一个étalon，我们观察到在退化和非退化范围内，横向模式剖面的空间对称性从矩形变为圆柱形。我们还模拟了滤波后光束穿过埃塔隆的透射率分布。我们的实验结果表明，这种改变对称性的方法在埃塔隆倾斜过程中保持了相对稳定性。

引用次数: 0

Carrier density dynamics and frequency shift in optically injected VCSELs 光注入 VCSEL 中的载流子密度动态和频移

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-18 DOI: 10.1016/j.optcom.2024.131227

Sami S. Alharthi, Najm Al-Hosiny

We theoretically and systematically study the dynamics of carrier density in optically injected VCSELs and correlate it to the observed frequency shift outside the locking region. We also show the dependence of carrier dynamics on all major parameters including frequency detuning, injection level and the linewidth enhancement factor (LEF).

我们从理论上系统地研究了光注入 VCSEL 中载流子密度的动态，并将其与在锁定区域外观察到的频率偏移相关联。我们还展示了载流子动力学对所有主要参数的依赖性，包括频率失谐、注入水平和线宽增强因子（LEF）。

引用次数: 0

Talbot-effect-based multiplication of Laguerre–Gaussian beams with non-zero radial indices: From theory to experimental realization 基于塔尔博特效应的非零径向指数拉盖尔-高斯光束乘法：从理论到实验实现

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-18 DOI: 10.1016/j.optcom.2024.131203

Pouria Amiri , Saifollah Rasouli , Davud Hebri , Sergey A. Ponomarenko

We present a Talbot self-imaging inspired method for multiplying Laguerre–Gaussian (LG) beams of non-zero radial indices. We explore theoretically and experimentally the LG beam diffraction from two-dimensional (2D) periodic structures. In particular, we determine near-field LG beam diffraction patterns from a 2D binary grating of a small opening ratio (OR). We demonstrate that incident LG beam intensity patterns are reproduced as images of individual square apertures of the grating in certain Talbot planes. We also investigate the impact of the number of fractional-Talbot and Talbot planes on the quality of the generated 2D array of multiplexed LG modes. Our theoretical predictions are in good agreement with our experiments. Our method can find applications in optical communication, optical tweezing, multi-particle trapping, screening, and micro-manipulation.

我们提出了一种受塔尔博特自成像启发的方法，用于倍增非零径向指数的拉盖尔-高斯（LG）光束。我们从理论和实验上探索了二维（2D）周期性结构的 LG 光束衍射。特别是，我们测定了小开口率（OR）二维二元光栅的近场 LG 光束衍射图样。我们证明，入射的 LG 光束强度模式在某些塔尔博特平面上再现为光栅单个方孔的图像。我们还研究了分数塔尔博特平面和塔尔博特平面的数量对生成的二维复用 LG 模式阵列质量的影响。我们的理论预测与实验结果非常吻合。我们的方法可应用于光通信、光镊、多粒子捕获、筛选和微操作等领域。

引用次数: 0

Weak-value amplification in fast and slow light in a ring resonator 环形谐振器中快慢光的弱值放大

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-18 DOI: 10.1016/j.optcom.2024.131209

Keigo Nakamura , Kazuki Bando , Takahiro Matsumoto , Makoto Tomita

We analyzed fast and slow light in a fiber-ring resonator in a framework of weak-value measurements, obtaining the explicit form of the interaction Hamiltonian. Here, we fully utilized the advantage of the fiber-ring resonator in experiments and directly observed the time delay of the circulating pulse inside the ring, as well as the delays of the total output pulses that traversed the system under different pre- and post-selection states. The mean arrival time of the total output pulse can be expressed as the delay time of the circulating pulse amplified by a factor that reflects the weak value, thus both fast and slow light in the fiber-ring resonator system are quantitatively described using the framework of weak-value amplification.

我们在弱值测量框架下分析了光纤环谐振器中的快慢光，得到了相互作用哈密顿的显式。在这里，我们在实验中充分利用了光纤环谐振器的优势，直接观测了环内循环脉冲的时间延迟，以及在不同的选择前和选择后状态下穿越系统的总输出脉冲的延迟。总输出脉冲的平均到达时间可以表示为循环脉冲的延迟时间放大了一个反映弱值的因子，因此光纤环谐振器系统中的快光和慢光都可以用弱值放大的框架来定量描述。

引用次数: 0

Topological charge of a Gaussian beam with an off-axis optical vortex 带有离轴光学漩涡的高斯光束的拓扑电荷

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-17 DOI: 10.1016/j.optcom.2024.131220

Vitaly P. Panov , Doyeon Lee , V.V. Kotlyar , A.A. Kovalev , P.A.N.S. Priyadharshana , Keumcheol Kwak , L.K. Migara , Jang-Kun Song

We show that when an optical vortex with a topological charge n shifts from the optical axis of a Gaussian beam, the orbital angular momentum decreases, whereas the topological charge remains unchanged. We experimentally confirmed this phenomenon with the aid of a q-plate array generated in a liquid crystal cell filled with a frustrated chiral nematic. We also theoretically proved that the topological charge of an optical vortex is conserved when the optical vortex is displaced from the axis.

我们的研究表明，当拓扑电荷为 n 的光涡旋偏离高斯光束的光轴时，轨道角动量会减小，而拓扑电荷保持不变。我们借助在充满受挫手性向列的液晶池中生成的 q 板阵列，在实验中证实了这一现象。我们还从理论上证明，当光学漩涡偏离轴线时，其拓扑电荷是守恒的。

引用次数: 0

Reducing dislocations for room-temperature continuous-wave InGaAs/AlGaAs multiple quantum well lasers monolithically grown on Si 减少硅上单片生长的室温连续波 InGaAs/AlGaAs 多量子阱激光器的位错

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-16 DOI: 10.1016/j.optcom.2024.131214

Hao Liu , Chen Jiang , Shuaicheng Liu , Jihong Ye , Hao Zhai , Jian Li , Jun Wang , Qi Wang , Xin Wei , Xiaomin Ren

As dislocation-sensitive light-emitting devices, quantum well lasers monolithically grown on Si substrates operate poorly compared to their counterparts on native ones. In this work, a GaAs/Si virtual substrate with a low threading dislocation density of 8.9 × 10⁶/cm² was achieved by using a combined dislocation-reducing method. Meanwhile, by using two In-containing strained layer separately inserted into upper and lower AlGaAs cladding layers, the active region was virtually free of gliding dislocations. With the reduced dislocations in the active region, the fabricated Si-based broad-stripe ridged lasers exhibited continuous-wave lasing at room temperature, and a low threshold current density of 1015 A/cm², high operation temperature of 90 °C as well as a device lifetime of over 87.25 h were achieved. These results demonstrate an experimentally feasible way to optimize a Si-based InGaAs/AlGaAs quantum well laser and further promote the research on monolithic integration.

作为对位错敏感的发光器件，在硅衬底上单片生长的量子阱激光器与在原生衬底上生长的量子阱激光器相比，工作性能较差。在这项工作中，通过使用联合位错减少方法，实现了穿线位错密度低至 8.9 × 106/cm2 的砷化镓/硅虚拟衬底。同时，通过在上下 AlGaAs 包层中分别插入两个含 In 的应变层，有源区几乎不存在滑动位错。随着有源区位错的减少，制备出的硅基宽条纹脊状激光器在室温下表现出连续波激光，并实现了 1015 A/cm2 的低阈值电流密度、90 ℃ 的高工作温度以及超过 87.25 h 的器件寿命。这些结果证明了优化硅基 InGaAs/AlGaAs 量子阱激光器的实验可行性，并进一步推动了单片集成的研究。

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引用次数: 0

A bandwidth allocation scheme based on GRU traffic prediction in passive optical networks 无源光网络中基于 GRU 流量预测的带宽分配方案

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-16 DOI: 10.1016/j.optcom.2024.131222

Shiwen Song , Qinghua Tian , Xiao Zhang , Xiangjun Xin , Fu Wang , Dandan Sun , Xiongyan Tang , Lei Zhu , Feng Tian , Sitong Zhou , Qi Zhang

With the advancement of information technology, network slicing technology has emerged as a viable solution for ensuring Quality of Service (QoS) in optical access networks. Current research is increasingly focusing on the integration of optical access networks with network slicing technologies. This paper proposes a bandwidth allocation scheme based on traffic prediction, specifically designed for resource management in optical network slicing scenarios. The scheme employs a Gated Recurrent Unit (GRU) neural network model to forecast future traffic, and combines bandwidth and latency factors to allocate bandwidth to each slice based on predicted values, thereby meeting the QoS requirements of various services. Simulation results indicate that, compared to the baseline algorithm, the proposed scheme achieved a 35.42% increase in Explaining Variance Score (EVS) and a 38.16% improvement in R2 score for factory slicing prediction. Similarly, for data center slicing prediction, the EVS score increased by 32.29% and the R2 score improved by 41.96%. In terms of performance metrics such as latency, packet loss rate, and throughput, the proposed algorithm outperforms both traditional prediction algorithms and the baseline algorithm.

随着信息技术的发展，网络切片技术已成为确保光接入网服务质量（QoS）的可行解决方案。目前的研究越来越关注光接入网络与网络切片技术的整合。本文提出了一种基于流量预测的带宽分配方案，专门用于光网络切片方案中的资源管理。该方案采用门控递归单元（GRU）神经网络模型预测未来流量，并结合带宽和延迟因素，根据预测值为每个切片分配带宽，从而满足各种服务的 QoS 要求。仿真结果表明，与基线算法相比，在工厂切片预测方面，拟议方案的解释方差得分（EVS）提高了 35.42%，R2 得分提高了 38.16%。同样，在数据中心切片预测方面，EVS 得分提高了 32.29%，R2 得分提高了 41.96%。就延迟、丢包率和吞吐量等性能指标而言，所提出的算法优于传统预测算法和基线算法。

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引用次数: 0

Infrared non-uniformity correction method based on binocular detection system without blindsight 基于无盲区双目检测系统的红外非均匀性校正方法

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-16 DOI: 10.1016/j.optcom.2024.131219

Honghong Lu , Tong Liu , Zhenhua Li

The output image of an infrared detector often suffers from non-uniformity due to the inhomogeneity of the device material and limitations in the manufacturing process, which can reduce the detector's capability to detect and identify targets. It is therefore necessary to adequately correct the non-uniformity to fully utilize the high temperature sensitivity of the detector. Calibration-based non-uniformity correction technology is one of the earliest and most effective methods of correcting non-uniformity. Typically, a relatively uniform shutter is used to mask the field of view for calibration correction. However, this process interrupts the observation due to the need for masking, severely limiting its use in real-world projects. In order to maintain the performance superiority of the calibration-based method and eliminate the defect of target loss caused by masking, this paper takes the occlusion calibration as the theoretical basis, which consists of dual detectors to form a binocular detection system, and uses one of the occluded calibration auxiliary detector to assist the other occlusion-free primary detector, and takes advantage of the fact that the radiation is the same when observing the same target at the same time to make the correct response based on the steepest gradient descent learning algorithm, which removes the non-uniformity while achieving detail fidelity, no ghosting and continuous output.

由于设备材料的不均匀性和制造工艺的局限性，红外探测器的输出图像往往存在不均匀性，这会降低探测器探测和识别目标的能力。因此，有必要对不均匀性进行充分校正，以充分利用探测器的高温灵敏度。基于校准的非均匀性校正技术是校正非均匀性最早也是最有效的方法之一。通常情况下，使用一个相对均匀的快门来遮挡视场，以进行校准校正。然而，由于需要遮挡，这一过程会中断观测，严重限制了其在实际项目中的应用。为了保持基于校准方法的性能优势，消除遮挡造成目标丢失的缺陷，本文以遮挡校准为理论基础，由双探测器组成双目探测系统，利用其中一个遮挡校准辅助探测器辅助另一个无遮挡主探测器、并利用同时观测同一目标时辐射相同这一事实，基于最陡梯度下降学习算法做出正确响应，在消除非均匀性的同时实现细节保真、无重影和连续输出。

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引用次数: 0

41.6nm/44 fs Mamyshev Yb-doped fiber laser with bound-state solitons and multiple harmonics 具有束缚态孤子和多谐波的 41.6nm/44 fs Mamyshev 掺镱光纤激光器

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2024-10-16 DOI: 10.1016/j.optcom.2024.131221

Yuqi Sun , Yuanzhu Zhou , Yuezhang Hou , Yangmei Liu , Ting Luo , Zhili Li , Baoqun Li , Tianshu Wang , Xinjian Pan

A circular Mamyshev Yb-doped fiber laser was experimentally designed, and multiple pulse modes, including single-pulse, bound-state pulse, and harmonic mode-locked pulse, were observed by modulating the seed source and pump power. Single-pulse mode-locking with a single-pulse energy of 68.6 nJ was demonstrated at a repetition frequency of 12.1 MHz with a spectral half-height width of 41.6 nm and a compressed pulse duration of 44 fs. Results were also obtained for bound-state and harmonic mode-locked pulses, both with post-compression pulse durations of less than 100 fs. The experiments provide validation of the dynamics of a wide range of pulses in Mamyshev lasers. These findings have implications for the further exploration and understanding of pulse dynamics within the optical domain.

实验设计了一种圆形马梅雪夫掺镱光纤激光器，并通过调制种子源和泵浦功率观测到了多种脉冲模式，包括单脉冲、束缚态脉冲和谐波锁模脉冲。在重复频率为 12.1 MHz、光谱半高宽度为 41.6 nm、压缩脉冲持续时间为 44 fs 的条件下，演示了单脉冲能量为 68.6 nJ 的单脉冲锁模。此外，还获得了束缚态和谐波模式锁定脉冲的结果，压缩后脉冲持续时间均小于 100 fs。这些实验验证了马梅雪夫激光器中各种脉冲的动力学特性。这些发现对进一步探索和理解光域内的脉冲动力学具有重要意义。

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