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Open whispering gallery mode resonators. 开放式耳语廊模式谐振器
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.540748
D R Kazanov, A M Monakhov
{"title":"Open whispering gallery mode resonators.","authors":"D R Kazanov, A M Monakhov","doi":"10.1364/OL.540748","DOIUrl":"10.1364/OL.540748","url":null,"abstract":"<p><p>There are some issues with traditional whispering gallery mode (WGM) resonators such as poor light extraction and a dense mode spectrum. In this paper, we introduce a solution to these limitations by proposing open WGM (OWGM) resonators that effectively reduce the mode density and enable directional radiation through a connected waveguide at the expense of some lowering in Q-factor. Numerical simulations of two-dimensional metallic and dielectric disk resonators with holes reveal a significant increase in intermode distance. The study also extends to three-dimensional dielectric OWGM resonators, demonstrating the formation of sparse spectra suitable for photonic applications. Additionally, the design of a cylindrical Bragg microresonator connected to a single-mode fiber via an optimized topology-based connector achieves near-unity transmission and efficient coupling. This approach enhances the development of new photonic devices, addressing the limitations of traditional high Q-factor WGM resonators and offering potential advancements in laser technology and optical communications.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6577-6580"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
LUT enabled low-complexity electrical dispersion pre-compensation scheme for IM-DD systems. 针对 IM-DD 系统的 LUT 低复杂度电色散预补偿方案。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.541313
Weihao Ni, Dongdong Zou, Yifan Chen, Fan Li
{"title":"LUT enabled low-complexity electrical dispersion pre-compensation scheme for IM-DD systems.","authors":"Weihao Ni, Dongdong Zou, Yifan Chen, Fan Li","doi":"10.1364/OL.541313","DOIUrl":"10.1364/OL.541313","url":null,"abstract":"<p><p>Frequency selective fading caused by chromatic dispersion (CD) and direct detection is the primary impediment for IM-DD systems in achieving a large capacity-distance product. Gerchberg-Saxton (GS) based electrical dispersion pre-compensation (pre-EDC) schemes enhance IM-DD systems' robustness against chromatic dispersion (CD), but their high computational complexity limits practical implementation. In this Letter, a novel, to the best of our knowledge, low-complexity pre-EDC scheme enabled by the cluster-assisting look-up table (CLUT) technique is proposed to further reduce the computation complexity of the non-iterative FIR-based pre-EDC scheme, in which convolution operation is replaced by tables look-up and accumulation processing. And a key strategy is proposed to balance the number and the total size of the LUTs by establishing LUTs for each cluster center after clustering the tap weights. To validate the effectiveness of the proposed scheme, we experimentally demonstrate the transmission of 80 Gbit/s PAM-4 signals and 100 Gbit/s PAM-6 signals over 20 km standard single-mode fiber (SSMF). The experimental results show that the proposed scheme can eliminate the multiplication in convolution operations and reduce the addition times of 58.54% for PAM-4 and 51.22% for PAM-6 signals at the BER of 7% HD-FEC threshold without any penalty.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6417-6420"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Programmable spectral peak generation by a mode-locked Er-fiber laser with an intracavity LCOS-SLM filter. 带有腔内 LCOS-SLM 滤波器的模式锁定铒光纤激光器产生的可编程光谱峰值。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.542118
Shotaro Kitajima, Sakiko Kobata, Norihiko Nishizawa
{"title":"Programmable spectral peak generation by a mode-locked Er-fiber laser with an intracavity LCOS-SLM filter.","authors":"Shotaro Kitajima, Sakiko Kobata, Norihiko Nishizawa","doi":"10.1364/OL.542118","DOIUrl":"10.1364/OL.542118","url":null,"abstract":"<p><p>Applying intracavity spectral phase and/or intensity modulation to a mode-locked laser can control the state of circulating pulses in the cavity and produce unique and useful pulse outputs. In this study, a mode-locked Er-doped fiber laser with an intracavity high-resolution liquid crystal-on-silicon spatial light modulator (LCOS-SLM) spectral filter was developed, and programmable narrow linewidth spectral peak generation directly from the oscillator was demonstrated. Furthermore, by simultaneously controlling the intracavity group delay dispersion (GDD), the generation of 20 spectral peaks with a linewidth of 100 pm over a bandwidth of 17 nm was demonstrated. Spectral modulation also affects the temporal waveform, and burst-like pulse trains with intra-burst repetition rates up to 252 GHz were observed.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6529-6532"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Standardization of metal coil configuration in thermoacoustic imaging. 热声成像中金属线圈配置的标准化。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.539348
Li Su, Juan J Rodríguez-Andina, Tianming Li
{"title":"Standardization of metal coil configuration in thermoacoustic imaging.","authors":"Li Su, Juan J Rodríguez-Andina, Tianming Li","doi":"10.1364/OL.539348","DOIUrl":"https://doi.org/10.1364/OL.539348","url":null,"abstract":"<p><p>Existing TAI systems mostly use metal wires to calibrate their spatial resolution. However, research on the imaging mechanism of the metal wire and the setting of the wire parameters that can affect the system's spatial resolution is not sufficient in this context. In general, there is a lack of understanding of the factors affecting spatial resolution. A TAI system, consisting of parallel plate irradiation structures has been developed. Results show that the source of the thermoacoustic signals is the ohmic loss generated by the induced electromotive force. Moreover, the pulse width of the induced electromotive force signal is narrower than that of the system excitation signal, which holds the potential benefits for improving the spatial resolution of the TAI.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6465-6468"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Edge and skin effects in rhombus reciprocal photonic crystals. 菱形互惠光子晶体中的边缘和表皮效应
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.544314
Luoshu Hu, Ran Hao
{"title":"Edge and skin effects in rhombus reciprocal photonic crystals.","authors":"Luoshu Hu, Ran Hao","doi":"10.1364/OL.544314","DOIUrl":"https://doi.org/10.1364/OL.544314","url":null,"abstract":"<p><p>With the development of non-Hermitian physics, the non-Hermitian skin effect (NHSE) has attracted much attention. Existing research highlights the critical roles of the periodic boundary condition (PBC) spectrum, lattice symmetry, and macroscopic symmetry of the lattice in relation to the geometry-dependent skin effect (GDSE). However, the impact of macroscopic edge geometry is frequently neglected. We find that the GDSE is highly sensitive to the edge and cannot be simply determined by the symmetries. Specifically, the GDSE can emerge at trivial interfaces of rhombus photonic crystals (PhCs) with zigzag edge and bearded edge. Furthermore, we analyze the underlying mechanisms from the perspective of point-gap topology. This work underscores important, yet frequently overlooked, aspects in two-dimensional (2D) reciprocal PhC systems and can be used to enhance design flexibility, allowing the NHSE to have better applications in areas such as lasers and highly sensitive sensors.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6541-6544"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Effect of the estimation result of the degree of polarization of target light on clear imaging. 目标光偏振程度的估计结果对清晰成像的影响。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.542938
Jinxin Deng, Jingping Zhu, Haoxiang Li, Angze Li, Yucai Kuang, Xiaofang Liu, Xun Hou
{"title":"Effect of the estimation result of the degree of polarization of target light on clear imaging.","authors":"Jinxin Deng, Jingping Zhu, Haoxiang Li, Angze Li, Yucai Kuang, Xiaofang Liu, Xun Hou","doi":"10.1364/OL.542938","DOIUrl":"https://doi.org/10.1364/OL.542938","url":null,"abstract":"<p><p>Previous underwater imaging methods have not developed a clear idea of estimating the degree of polarization of target light (Pobj). To address this issue, this Letter answers the question of how the estimation result of Pobj affects clear imaging. First, the theoretical derivation states that Pobj is simply a scale modulation factor of the imaging result. Second, experiments are conducted for validation, and results conform well to the derivation. Hence, the effect of the estimated Pobj on clear imaging is obtained. This parameter only influences brightness rather than contrast but may cause noise amplification as well as the unfavorable result of negative pixels. Therefore, no precise estimation is needed; pick the value near the ends of the definition domain directly and take the absolute value. Based on these, a new imaging formula is proposed, enabling the processing time to fulfill the actual dynamic imaging requirements. As far as we are concerned, the attained prior knowledge and formula could provide strong assistance for underwater polarization imaging.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6433-6436"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Evanescent point sources: application to microsphere-assisted super-resolution microscopy. 疏散点源：应用于微球辅助超分辨率显微镜。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.542794
Rayenne Boudoukha, Stéphane Perrin, Assia Guessoum, Nacer-E Demagh, Paul Montgomery, Sylvain Lecler
{"title":"Evanescent point sources: application to microsphere-assisted super-resolution microscopy.","authors":"Rayenne Boudoukha, Stéphane Perrin, Assia Guessoum, Nacer-E Demagh, Paul Montgomery, Sylvain Lecler","doi":"10.1364/OL.542794","DOIUrl":"10.1364/OL.542794","url":null,"abstract":"<p><p>In the rigorous electromagnetic simulation of an imaging system, the evanescent waves from a point source or from a sample are naturally mixed with the propagative waves. Therefore, their contributions are difficult to distinguish. We present a point-source model made of only the evanescent waves. To illustrate its potential, the model is applied to the study of the evanescent-wave contribution in microsphere-assisted microscopy (MAM). The contribution of the evanescent waves in the microsphere imaging process is clearly demonstrated. However, we also show that this contribution is not enough to justify the super-resolution. The destructive interference between two close point sources may be the key physical phenomenon.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6429-6432"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Holographically fabricated out-of-plane blazed gratings and channel waveguides in silica for integrated free-space beam delivery. 用于集成自由空间光束传输的全息面外光栅和二氧化硅通道波导。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.537811
Q Salman Ahmed, Paul C Gow, James W Field, Dong-Woo Ko, Rex H S Bannerman, Peter Horak, Christopher Holmes, Peter G R Smith, Corin B E Gawith, James C Gates
{"title":"Holographically fabricated out-of-plane blazed gratings and channel waveguides in silica for integrated free-space beam delivery.","authors":"Q Salman Ahmed, Paul C Gow, James W Field, Dong-Woo Ko, Rex H S Bannerman, Peter Horak, Christopher Holmes, Peter G R Smith, Corin B E Gawith, James C Gates","doi":"10.1364/OL.537811","DOIUrl":"https://doi.org/10.1364/OL.537811","url":null,"abstract":"<p><p>Grating couplers are widely used in integrated optics to generate free-space beams and facilitate localized interactions with systems such as atom or ion traps. However, etched devices often exhibit small-scale inconsistencies; exacerbated by the high index contrast of the devices, this can lead to phase errors, limiting devices to a sub-millimeter scale. Here we present the first demonstration, to our knowledge, of tilted, out-of-plane blazed gratings in planar silica fabricated by UV inscription using a 213 nm laser. Our devices deliver collimated and focusing beams into free space from a waveguide input without the need for additional optics such as beam expanders.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6461-6464"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
SDN-controlled multi-user NOMA-OFDM VLC system based on a resource allocation algorithm. 基于资源分配算法的 SDN 控制多用户 NOMA-OFDM VLC 系统。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.537984
Yongxin Wang, Jianhang Li, Chengju Hu, Yang Hong, Jian Zhao
{"title":"SDN-controlled multi-user NOMA-OFDM VLC system based on a resource allocation algorithm.","authors":"Yongxin Wang, Jianhang Li, Chengju Hu, Yang Hong, Jian Zhao","doi":"10.1364/OL.537984","DOIUrl":"https://doi.org/10.1364/OL.537984","url":null,"abstract":"<p><p>We propose a novel, to our knowledge, resource allocation algorithm (RAA) for a multi-user non-orthogonal multiple access orthogonal frequency division multiplexing (NOMA-OFDM) visible light communication (VLC) system. The proposed algorithm considers both the interference between users and their channel diversity. Bit allocation to users in each iteration is based on the ratio between the already allocated number of bits and the demanded number of bits of users, rather than their channel gains. In this way, the inherent issue of prioritizing strong users in a conventional RAA is avoided. We implement a software-defined-network (SDN)-controlled VLC system with real-time signal generation to validate the proposed RAA. The allocation results in the SDN platform are used to configure a FPGA-based transmitter. Experiments of a two-user NOMA-OFDM system with 115-191 Mbit/s throughput show that the system can dynamically react to the change of data demand and channel responses of users. We further demonstrate that the proposed algorithm outperforms conventional RAAs regardless of the data demand, receiving angles, and distances of users.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6505-6508"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Sub-volt forward-biased silicon microring modulator at 210 Gb/s. 210 Gb/s 的亚伏特正向偏压硅微波调制器。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2024-11-15 DOI: 10.1364/OL.535202
David W U Chan, Hon Ki Tsang
{"title":"Sub-volt forward-biased silicon microring modulator at 210 Gb/s.","authors":"David W U Chan, Hon Ki Tsang","doi":"10.1364/OL.535202","DOIUrl":"10.1364/OL.535202","url":null,"abstract":"<p><p>Low-voltage and efficient optical modulators in the silicon photonic (SiPh) platform are highly desired for realizing high-speed connectivity in chip level interconnects, data center interconnects, and high-performance computing (HPC). With the modulator operating at CMOS compatible voltages, high-voltage modulator drivers are no longer needed, thus reducing driver design complexity and power consumption. We demonstrate a silicon microring modulator (MRM) operating at a driving voltage of 0.8 V<sub>pp.</sub> We achieve high modulation efficiency by using a small forward bias of 0.2 V: the forward bias voltage allows the modulator to have an enhanced optical modulation amplitude (OMA) by operating near injection mode, modulating 180 Gb/s (180 Gbaud) non-return-to-zero (NRZ) and 210 Gb/s (105 Gbaud) 4-level pulse amplitude modulation (PAM-4) free of electrical or optical amplification. We also demonstrate the operation at zero bias and achieve up to 200 Gb/s. Error-free operation was observed at 130 Gb/s (NRZ). The absence of an external biasing voltage can further improve energy efficiency and simplifies device integration.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"49 22","pages":"6477-6480"},"PeriodicalIF":3.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
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