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Interleaved bidirectional angled multimode interferometer for wavelength division (de)multiplexings 用于波分(解)复用的交错双向角度多模干涉仪
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-23 DOI: 10.1117/1.oe.62.10.107101
Zanyun Zhang, Jiaming Xing, Beiju Huang, Tianjun Liu, Kaixin Zhang, Meixin Li, Hao Jiang, Qixin Wang
We propose and experimentally demonstrate a bidirectional angled multimode interferometer (Bi-AMMI) for interleaved wavelength division multiplexing applications. The spectral response of the 2 × 4 Bi-AMMI is obtained using an eigenmode expansion method, including the cross coupling between the input and output ports at the same side of the multimode waveguide. To verify our design, both the standalone and interleaved Bi-AMMIs were fabricated and measured. The Bi-AMMI exhibits an insertion loss of 0.99 to 1.21 dB, and the unwanted cross coupling is lower than −20 dB. The interleaved device exhibits a measured optical loss of 4.77 to 5.02 dB, and the average crosstalk is calculated to be −18 dB.
我们提出并实验证明了一种双向角度多模干涉仪(Bi-AMMI)用于交错波分复用应用。利用本征模展开法得到了2 × 4双ammi的光谱响应,包括多模波导同侧输入输出端口之间的交叉耦合。为了验证我们的设计,制作并测量了独立和交错的bi - ammi。Bi-AMMI的插入损耗为0.99 ~ 1.21 dB,不必要的交叉耦合低于- 20 dB。该器件的测量光损耗为4.77 ~ 5.02 dB,平均串扰为−18 dB。
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引用次数: 0
Opto-thermo-mechanical phenomena in satellite free-space optical communications: survey and challenges 卫星自由空间光通信中的光热力学现象:综述与挑战
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-19 DOI: 10.1117/1.oe.63.4.041206
Mario Badás, Pierre Piron, Jasper Bouwmeester, Jérôme Loicq, Hans Kuiper, Eberhard Gill
Growing interest in free-space optical communication, due to the high bandwidth and security provided by these links, has generated the necessity of designing high-performance satellite terminals. In order to develop these terminals, the opto-thermo-mechanical phenomena that appear in the space environment and their effect on optical communication links have to be understood in detail. A review of the opto-thermo-mechanical phenomena occurring in spaceborne terminals is presented, describing the relevance of each of them. The methods found to compute the impact on the communication performance due to opto-thermo-mechanical phenomena are collected by building the bridge between the optical and communication performance parameters. Finally, techniques available to mitigate the detrimental effects of these phenomena are classified, and the relevant research challenges are identified.
由于这些链路提供的高带宽和安全性,人们对自由空间光通信的兴趣日益浓厚,这就产生了设计高性能卫星终端的必要性。为了开发这些终端,必须详细了解空间环境中出现的光热机械现象及其对光通信链路的影响。综述了星载终端中出现的光热机械现象,描述了它们之间的相关性。通过建立光学和通信性能参数之间的桥梁,收集了计算光热机械现象对通信性能影响的方法。最后,对可用于减轻这些现象的有害影响的技术进行了分类,并确定了相关的研究挑战。
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引用次数: 0
Optical design of a multiscale imager in 8 to 12 μm spectral band using monocentric lens 单心透镜8 ~ 12 μm波段多尺度成像仪的光学设计
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-19 DOI: 10.1117/1.oe.62.10.105104
Manish Uniyal, Ranabir Mandal, Pramod Kumar Sharma
Long-wave infrared (LWIR) imagers utilize self emission in 8 to 12 μm spectral band to image objects passively even during night time when the reflected radiation is not available. These are mostly used for surveillance purpose requiring large field of view (FOV). Achieving wide FOV and high-resolution image of megapixel (MP) order requires higher format detectors that are not readily available in LWIR. Further, the optical performance gets limited by fundamental limits of space bandwidth factor. An LWIR monocentric multiscale imager is proposed. The designed lens operates at f / 1.5 with effective focal length (EFL) of 50 mm and effective pixel count of 3.9 MP. It covers 80 deg × 16 deg FOV over five detector arrays. We discuss the basics of multiscale imaging, the specific issues in LWIR band and their mitigation, optical design approach and finally analyze the optical performance of the designed lens.
长波红外(LWIR)成像仪利用8 ~ 12 μm波段的自发射,即使在没有反射辐射的夜间也能被动成像。这些主要用于需要大视场(FOV)的监视目的。实现宽视场和百万像素(MP)级的高分辨率图像需要更高格式的检测器,这在LWIR中是不容易获得的。此外,光学性能受到空间带宽因素的基本限制。提出了一种LWIR单中心多尺度成像仪。设计的镜头工作在f / 1.5,有效焦距(EFL)为50 mm,有效像素数为3.9 MP。它覆盖80度× 16度的视场超过五个探测器阵列。讨论了多尺度成像的基本原理、低红外波段的具体问题及其解决方法、光学设计方法,最后分析了所设计透镜的光学性能。
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引用次数: 0
All-optical reversible PNOR logic gate using semiconductor optical amplifiers at 100 Gb/s 全光可逆PNOR逻辑门采用半导体光放大器,速度为100gb /s
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-19 DOI: 10.1117/1.oe.62.10.108101
Amer Kotb, Kyriakos E. Zoiros, Eng Hwa Yap
The loss of one bit of information causes energy dissipation in traditional logic gates at ambient temperature, but when the number of bits is greater, as in high-speed networks, the heat released by them is so great that it impacts performance and shortens component lifetime. Using reversible logic gates, which ideally result in zero energy dissipation, these problems in ordinary Boolean functions can be solved. At 100 Gb/s, an all-optical three-input-output reversible PNOR logic gate is numerically simulated in this article using semiconductor optical amplifiers (SOAs)-based switching units. The quality factor (Q-factor) and the bit error rate (BER) are the metrics against which the performance of reversible PNOR operation is assessed. The results indicate the feasibility of realizing all-optically the PNOR gate at 100 Gb/s since the SOA-based scheme, along with correct logic operation, manages to achieve more than acceptable Q-factor and BER.
传统逻辑门在环境温度下,丢失一个比特信息会导致能量耗散,但当比特数较大时,如在高速网络中,它们释放的热量非常大,会影响性能并缩短元件寿命。使用可逆逻辑门可以解决普通布尔函数中的这些问题,这种逻辑门可以理想地实现零能量耗散。本文采用基于半导体光放大器(soa)的开关单元,对100 Gb/s速率下的全光三输入输出可逆PNOR逻辑门进行了数值模拟。质量因子(q因子)和误码率(BER)是评估可逆PNOR操作性能的指标。结果表明,在正确的逻辑操作下,基于soa的全光PNOR门实现100gb /s的全光PNOR门是可行的,并且可以获得超过可接受的q因子和误码率。
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引用次数: 0
Infrared lens units using chalcogenide glass with high transmission properties (Erratum) 红外透镜单元采用具有高透射性能的硫系玻璃(勘误)
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-18 DOI: 10.1117/1.oe.62.10.109801
Yoshimasa Matsushita, Fumio Sato, Noriaki Masuda, Masafumi Kimata
Abstract. Erratum corrects misspelling in an author name.
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引用次数: 0
Dynamic three-dimensional shape measurement based on an adaptive phase unwrapping method 基于自适应相位展开方法的动态三维形状测量
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-18 DOI: 10.1117/1.oe.62.10.104104
Wang Xiang, Linrui Wang, Junfei Dai
We present an adaptive phase unwrapping method based on geometric constraints and the gradient field without additional images for high-speed three-dimensional (3D) shape measurement. Specifically, we reconstruct the 3D geometry of moving objects frame by frame. We first create a reference phase map at the depth provided by the former frame. Then we optimize the depth value by validating the continuity of the computed unwrapped phase based on the modulus of the gradient field and recalculate the correct absolute phase map with the optimal depth value. After reconstructing the 3D geometry of the current frame, 3D data are delivered to the next frame. In particular, a geometric constraint-based method is applied in the first frame. Experiment results indicate that our approach, which requires only three phase-shifted fringe patterns per frame, can measure moving objects with high accuracy and robustness. Additionally, several isolated objects can also be measured by our method if they are continuous.
提出了一种基于几何约束和梯度场的无附加图像自适应相位展开方法,用于高速三维形状测量。具体来说,我们一帧一帧地重建运动物体的三维几何形状。我们首先在前一帧提供的深度处创建一个参考相位图。然后根据梯度场的模量验证解包裹相位的连续性来优化深度值,并以最优深度值重新计算正确的绝对相位图。重建当前帧的三维几何结构后,将三维数据传递给下一帧。特别地,在第一帧中采用了基于几何约束的方法。实验结果表明,该方法每帧只需要三个相移条纹图,就可以测量运动目标,具有较高的精度和鲁棒性。此外,如果几个孤立的物体是连续的,也可以用我们的方法测量。
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引用次数: 0
Review on UAV-based FSO links: recent advances, challenges, and performance metrics 基于无人机的FSO链路综述:最新进展、挑战和性能指标
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-18 DOI: 10.1117/1.oe.63.4.041204
Aanchal Gupta, Divya Dhawan, Neena Gupta
With the rapid advancements in wireless technology, the incorporation of unmanned aerial vehicles (UAVs) in free space optical (FSO) communication can reap several benefits related to coverage, security, and capacity. The parameters involved for the analysis of such systems are studied in detail. The irradiance fluctuations in the received beam due to turbulence induced fading and geometric and misalignment effects are to be taken care of in order to minimize the bit error rate. The random variables involved in a UAV-employed FSO link are larger than that present in an FSO system. Thus, efficient designing of a UAV-employed FSO system is relatively more challenging as compared to a ground-based terrestrial FSO link. There are many performance metrics that can be defined and are to be analyzed in order to optimize the parameters associated with UAV-based FSO systems and design a link with good quality of service. Some recent methods are also explored for further improving the reliability and coverage of UAV based FSO networks.
随着无线技术的快速发展,在自由空间光(FSO)通信中加入无人机(uav)可以获得与覆盖、安全性和容量相关的几个好处。详细研究了这类系统分析所涉及的参数。为了使误码率最小化,接收光束中由于湍流引起的衰落以及几何和不对准效应而引起的辐照度波动必须加以注意。无人机使用的FSO链路所涉及的随机变量比FSO系统中存在的随机变量大。因此,与地面地面FSO链路相比,无人机采用的FSO系统的有效设计相对更具挑战性。为了优化与无人机FSO系统相关的参数并设计具有良好服务质量的链路,可以定义和分析许多性能指标。为进一步提高基于无人机的FSO网络的可靠性和覆盖范围,探讨了一些新的方法。
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引用次数: 0
Spatiotemporal hollow multi-ring optical solitons in strongly nonlocal nonlinear media 强非局部非线性介质中的时空中空多环光孤子
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-13 DOI: 10.1117/1.oe.62.10.105103
Xiaping Zhang
Spatiotemporal optical solitons in strongly nonlocal nonlinear media (SNNM) are investigated theoretically and numerically by solving the ( 3 + 1 ) D Schrödinger equation in parabolic cylindric coordinates. The spatiotemporal optical solitons in parabolic cylindric coordinates are constructed by the Hermite–Gaussian pulses with topology charge l in the temporal domain and confluent hypergeometric beams with model number n, m in the spatial domain. The transverse field patterns of the solitons are manipulated by the confluent hypergeometric functions; meanwhile the Hermite–Gaussian pulses affect their transverse central peak’s intensity. Typical examples of the obtained soliton solutions are based on spatial mode numbers m, n, pulse topology charge l, and modulation depth q. The spatiotemporal hollow multi-ring optical soliton in SNNM with m ≠ 0 is first accessed. The spatiotemporal optical soliton keeps approximately non-dispersion properties in the temporal dimension, and their widths of packets remain steady in the spatial dimension. Their transverse central peak’s intensity vibrates and decays with the pulse topology charge l increasing. The spatiotemporal hollow multi-ring optical solitons in SNNM have potential applications in optical switches, optical communications, and three-dimensional microprinting.
通过在抛物柱坐标系下求解(3 + 1)D Schrödinger方程,对强非局部非线性介质(SNNM)中的时空光孤子进行了理论和数值研究。在抛物柱面坐标系下,时空光孤子由时域拓扑电荷为l的厄米-高斯脉冲和模型数为n, m的合流超几何光束构成。孤子的横向场模式由合流超几何函数控制;同时,厄米-高斯脉冲影响其横向中心峰的强度。得到了基于空间模数m、n、脉冲拓扑电荷l和调制深度q的典型孤子解。首先获得了m≠0的SNNM时空中空多环光孤子。时空光孤子在时间维度上保持近似非色散特性,其包的宽度在空间维度上保持稳定。它们的横向中心峰强度随脉冲拓扑电荷的增加而振动和衰减。SNNM中时空中空多环光孤子在光开关、光通信、三维微印刷等领域具有潜在的应用前景。
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引用次数: 0
Receiver architecture for on-off-keying free-space optical communications with channel estimation in the presence of residual spatial tracking error 存在剩余空间跟踪误差时信道估计的开断键自由空间光通信接收机结构
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-12 DOI: 10.1117/1.oe.63.4.041203
Kamran Kiasaleh
In this work, a receiver architecture for the detention of on-off-keying (OOK) signals using adaptive signal estimation and threshold setting for free-space optical communications is investigated. It is assumed that the received signal is impaired by channel fading, modeled using Málaga (M) distribution, and an imperfect pointing acquisition. In OOK communications, knowledge of the received signal is required to set the optimum receiver threshold. To that end, a linear estimation technique is utilized to estimate the combined impact of the residual pointing error and channel fading. The performance of the resulting receiver is evaluated and is compared with those of a receiver in which the channel and pointing impairments are ignored and with a receiver in which the channel and pointing impacts are replaced by the statistical averages of those impairments. It is shown that, for reasonable system parameters, the proposed receiver offers a significant improvement in performance in terms of the overall bit error rate (BER) when compared with its alternatives. For a scenario in which a significant pointing error is present, it is observed that channel estimation does not offer a benefit in terms of the overall BER.
在这项工作中,研究了一种用于自由空间光通信的自适应信号估计和阈值设置的开关键(OOK)信号延迟的接收器结构。假设接收到的信号受到信道衰落的损害,使用Málaga (M)分布建模,并且指向采集不完美。在OOK通信中,需要了解接收到的信号来设置最佳的接收器阈值。为此,利用线性估计技术对残差指向误差和信道衰落的综合影响进行估计。对结果接收器的性能进行评估,并与忽略信道和指向损害的接收器以及用这些损害的统计平均值代替信道和指向影响的接收器进行比较。结果表明,在合理的系统参数下,与其他方案相比,所提出的接收机在总体误码率(BER)方面提供了显着的性能改进。对于存在明显指向错误的场景,可以观察到信道估计在总体BER方面没有提供任何好处。
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引用次数: 0
Simultaneous three-dimensional deformation measuring based on a simple phase-shift device combination with tri-wavelength and three-CCD camera 基于三波长和三ccd相机组合的简单相移装置同时三维变形测量
4区 工程技术 Q4 OPTICS Pub Date : 2023-10-11 DOI: 10.1117/1.oe.62.10.104103
Minyang Wu, Boshuo Yang, Hanyang Jiang, Yingbiao An, Yan Li, Fujun Yang
A simple and effective phase-shift device is designed for the simultaneous and high-accuracy measurement of three-dimensional (3D) deformation using tri-wavelength electronic speckle pattern interferometry and a three-sensor charge-coupled device camera. The designed phase-shifter can provide tri-wavelength lasers quasi-π / 2 phase-step simultaneously. Multi-component phases related to 3D deformation information are extracted by a 90 deg step 4-frame technique from the separated red, green, and blue channels of color images. Six derivative components are further determined based on the retrieval phase maps. Experimental results demonstrate the validity and feasibility of the proposed method.
摘要设计了一种简单有效的相移装置,利用三波长电子散斑干涉法和三传感器电荷耦合器件相机同时高精度测量三维(3D)变形。所设计的移相器可以同时提供准-π / 2相阶跃的三波长激光器。采用90°步进4帧技术从彩色图像分离的红、绿、蓝通道中提取与三维变形信息相关的多分量相位。根据检索相位图进一步确定了6个导数分量。实验结果证明了该方法的有效性和可行性。
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引用次数: 0
期刊
Optical Engineering
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