journal
https://read.qxmd.com/read/38489470/pre-equalization-scheme-for-visible-light-communications-with-trial-and-error-learning
#1
JOURNAL ARTICLE
Shupeng Li, Yi Zou, Fangming Liu, Jian Song
In this Letter, we propose a novel, to the best of our knowledge, neural network pre-equalizer based on the trial-and-error (TE) mechanism for visible light communication. This approach, unlike indirect learning (IL) architecture, does not require an additional auxiliary post-equalizer. Instead, it allows the pre-equalizer to be trained directly from the transmitter side through continuous interaction with the actual system. In a 1.95-Gbps 64-QAM carrier-less amplitude phase (CAP) free space optical transmission platform, the proposed scheme demonstrates superior nonlinear approximation capabilities and noise resilience...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489469/virtual-reality-images-created-on-the-back-and-front-of-a-display
#2
JOURNAL ARTICLE
Yoichi Ogata, Mykyta Kolchiba
To better investigate the biological mechanism of microorganisms, we developed a novel, to the best of our knowledge, virtual reality (VR) microscope that incorporates a head-mounted display (HMD) that creates VR images with a digital microscope. This type of VR microscope can be used with any type of optical microscope. The fabricated microscope is quite different from a common bifocal device because it can create VR images on the back and front of a display. If the VR images are displayed with object (OBJ) images, they are observable in [2 × 2] (back and front VR images and OBJ images; 2 × 2 = 4 images)...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489468/single-photon-ranging-lidar-based-on-multi-repetition-rate-pulse-train-correlation-and-accumulation
#3
JOURNAL ARTICLE
Yan Kang, Xiaofang Wang, Tongyi Zhang, Wei Zhao
A single-photon lidar based on multi-repetition-rate pulse train correlation and accumulation is proposed, and a ranging experiment is conducted on a 32 m target. By accumulating the correlation ranging results of pulse trains with internal spacings of 80, 100, and 125 ns, the signal-to-noise ratio of the cross correlation function is improved by about three-fold, which enables our method to improve the ranging precisions by more than 20% compared with the single repetition-rate method, and the shorter the acquisition time, the more obvious the advantage will be...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489467/performance-evaluation-of-ground-layer-adaptive-optics-based-on-layer-correction-efficiency
#4
JOURNAL ARTICLE
Ziming Li, Ying Yang, Lanqiang Zhang, Linhai Huang, Changhui Rao
Ground layer adaptive optics (GLAO) has been widely employed in wide-field observations with ground-based telescopes. However, the present evaluation of GLAO performance lacks a criterion in terms of turbulence layer correction. This deficiency results in a significant gap in understanding the effectiveness of GLAO correction at different heights of the turbulence layer, thereby hindering the optimization of GLAO system performance. To bridge this gap, this Letter introduces a new, to the best of our knowledge, performance criterion for GLAO, termed layer correction efficiency (LCE)...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489466/super-resolution-lensless-on-chip-microscopy-based-on-array-illumination-and-sub-pixel-shift-search
#5
JOURNAL ARTICLE
Yulong Li, Jianshe Ma, Liangcai Cao, Ping Su
The resolution of a lensless on-chip microscopy system is constrained by the pixel size of image sensors. This Letter introduces a super-resolution on-chip microscopy system based on a compact array light source illumination and sub-pixel shift search. The system utilizes a closely spaced array light source composed by four RGB LED modules, sequentially illuminating the sample. A sub-pixel shift search algorithm is proposed, which determines the sub-pixel shift by comparing the frequency of captured low-resolution holograms...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489465/composite-membrane-of-graphene-oxide-and-gold-nanoparticles-functionalized-s-fiber-taper-aptasensor-for-highly-sensitive-bisphenol-a-detection
#6
JOURNAL ARTICLE
Wanmei Guo, Yongsen Yu, Chao Xin, Guangyong Jin
The S fiber taper (SFT) aptasensor with a composite sensitive membrane of graphene oxide and gold nanoparticles was proposed for the rapid and highly sensitive detection of bisphenol A (BPA). The SFT was obtained using a fusion splicer; subsequently, the composite film was deposited on its surface, and the specific aptamer was covalently bonded to the surface of gold nanoparticles. The detection mechanism relies on monitoring changes in the external refractive index induced by the specific binding of BPA to the aptamer...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489464/multiwavelength-erbium-doped-fiber-laser-using-the-polarization-hole-burning-effect-for-multichannel-acoustic-detection
#7
JOURNAL ARTICLE
Cheng Zhou, Shengnan Zhou, Jiajun Tian, Yong Yao, Yongkang Dong
We propose and demonstrate a novel, to the best of our knowledge, fiber-optic multipoint acoustic detection system based on a multiwavelength erbium-doped fiber (EDF) laser (MWEDFL) using the polarization-hole-burning effect with Fabry-Perot interferometers as the acoustic cavity-loss modulator. A polarization-wavelength-related filter is designed to assign a distinct polarization state to each laser wavelength. By adjusting the polarization state, the polarization-dependent loss and gain of each laser line are tuned to be equal, effectively suppressing the mode competition of EDF and enabling a stable MWEDFL...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489463/continuous-tuning-of-pulse-parameters-in-a-soliton-fiber-laser-by-adjusting-the-effect-of-nonlinear-polarization-rotation-publisher-s-note
#8
JOURNAL ARTICLE
Xintong Zhang, Haozhe Guo, Wenbin He, Xiaocong Wang, Qi Huang, Yu Zheng, Ruochen Yin, Zhiyuan Huang, Xin Jiang, Lixin Xu, Yuxin Leng, Meng Pang
This publisher's note contains a correction to Opt. Lett.49, 674 (2024)10.1364/OL.509981.
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489462/mode-conversion-of-various-solitons-in-parabolic-and-cross-phase-potential-wells
#9
JOURNAL ARTICLE
Qing Wang, Dumitru Mihalache, Milivoj R Belić, Ji Lin
We numerically establish the controllable conversion between Laguerre-Gaussian and Hermite-Gaussian solitons in nonlinear media featuring parabolic and cross-phase potential wells. The parabolic potential maintains the stability of Laguerre-Gaussian and Hermite-Gaussian beams, while the actual conversion between the two modes is facilitated by the cross-phase potential, which induces an additional phase shift. By flexibly engineering the range of the cross-phase potential well, various higher-mode solitons can be generated at desired distances...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489461/selecting-mode-by-the-complex-berry-phase-in-non-hermitian-waveguide-lattices
#10
JOURNAL ARTICLE
Lingzhi Zheng, Bing Wang, Chengzhi Qin, Lange Zhao, Shuyue Chen, Weiwei Liu, Peixiang Lu
Bloch oscillations (BOs) in a parity-time (PT)-symmetric Su-Schrieffer-Heeger (SSH) waveguide array are theoretically investigated. We show that the BOs are amplified or damped even for the systems to exhibit entirely real energy bands. The amplified and damped BOs stem from the complex Berry phase and closely relate to the topological properties of the lattice. For the topological nontrivial lattice, the amplification and attenuation of BOs are much more prominent than the trivial case and the output Bloch mode can be selected...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489460/all-dielectric-geometric-metasurfaces-for-the-generation-and-manipulation-of-perfect-high-order-poincar%C3%A3-sphere-beams
#11
JOURNAL ARTICLE
Kaixiang Cheng, Yan Li, Zhendong Zhang, Yi Liu, Yanhua Han, Xiaosai Wang
A high-order Poincaré sphere (HOPS) can be used to describe high-order modes of waveguides and vector beams, since it generalizes the feature of spin and the orbital angular momentum of light. HOPS beams are such beams with polarization states on the HOPS, which have potential applications in optical manipulation and optical communication. In general, the intensity distribution of this kind of beam changes with the topological charge, which limits their practical applications. Based on the concept of perfect vortex beams (PVBs), perfect HOPS beams have been proposed to solve this problem...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489459/full-stokes-polarimetry-based-on-an-inverse-designed-multi-foci-metalens
#12
JOURNAL ARTICLE
Shuyi Wang, Tie Hu, Shichuan Wang, Yunxuan Wei, Zihan Mei, Bing Yan, Wenhong Zhou, Zhenyu Yang, JinKun Zheng, YuanLong Peng, Ming Zhao
In the realm of metasurface-based polarimetry, well-known for its remarkable compactness and integration capabilities, previous attempts have been hindered by limitations such as the restricted choices of target polarization states and the inefficient focusing of light. To address these problems, this study introduces and harnesses a novel, to our knowledge, forward-solving model, grounded in the equivalence principle and dyadic Green's function, to inversely optimize the vectorial focusing patterns of metalenses...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489458/ghz-repetition-rate-sub-100-fs-ho-calgo-laser-at-2-1%C3%A2-%C3%A2%C2%B5m-with-watt-level-average-power
#13
JOURNAL ARTICLE
Weichao Yao, Mohsen Khalili, Yicheng Wang, Martin Hoffmann, Marcel van Delden, Thomas Musch, Clara J Saraceno
We report on a GHz fundamental repetition rate Kerr-lens mode-locked Ho:CALGO laser emitting at 2.1 µm. The laser employs a ring cavity to increase the fundamental repetition rate to 1.179 GHz and can be made to oscillate in both directions stably with nearly identical performance: for the counterclockwise oscillation, it generates 93-fs pulses at 1.68 W of average power, whereas 92 fs and 1.69 W were measured for the clockwise operation. Our current results represent the highest average power from a 2-µm GHz oscillator and, to our knowledge, the first sub-100-fs pulse duration from a Ho-based oscillator...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489457/spectral-causality-induced-optical-isolation-in-a-non-hermitian-modulated-photonic-cavity
#14
JOURNAL ARTICLE
Awanish Pandey
An optical isolator is reported using a coupled cavity photonic molecule. It is shown that by non-Hermitian modulation of the coupling between the cavities, spectral causal and anti-causal response from the cavity can be obtained allowing the flexibility to regulate power between different Floquet modes. The distribution of optical energy between the Floquet modes is exploited to realize an optical isolator by cascading two modulators with a passive filter in between. A complete and general analytical model is developed for the non-Hermitian modulation, and the cavity parameters are optimized to ensure efficient operation...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489456/demonstration-of-a-1%C3%A2-tw-peak-power-joule-level-ultrashort-tm-ylf-laser
#15
JOURNAL ARTICLE
Issa Tamer, Zbynek Hubka, Leily Kiani, Jason Owens, Andrew Church, František Batysta, Thomas Galvin, Drew Willard, Andrew Yandow, Justin Galbraith, David Alessi, Colin Harthcock, Brad Hickman, Candis Jackson, James Nissen, Sean Tardiff, Hoang Nguyen, Emily Sistrunk, Thomas Spinka, Brendan A Reagan
We report on the demonstration of a diode-pumped, Tm:YLF-based, chirped pulse amplification laser system operating at λ ≈ 1.9 µm that produces amplified pulse energies exceeding 1.5 J using a single 8-pass power amplifier. The amplified pulses are subsequently compressed to sub-300 fs durations by a diffraction grating pair, producing record >1 TW peak power pulses. To the best of our knowledge, this is the highest peak power demonstrated for any solid-state, near-2 µm laser architecture and illustrates the potential of Tm:YLF for the next generation of high-power, diode-pumped ultrashort lasers...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489455/optimized-pilot-structure-for-ps-pdm-ultrahigh-order-qam-coherent-optical-transmission
#16
JOURNAL ARTICLE
Xin Shi, Mingyi Gao, Xuejing Huang, Jiamin Fan, Xinbang Han, Xiaodi You, Gangxiang Shen
We proposed and experimentally demonstrated a general pilot structure for probabilistic shaped (PS)-polarization division multiplexing (PDM) M-ary quadrature amplitude modulation (MQAM) coherent optical transmission, where a portion of PS-MQAM symbols is exploited as the pilot symbols with the same information entropy as the transmitted signal. The pilot symbols are simultaneously used in the entire digital signal processing (DSP) modules for polarization de-multiplexing, frequency offset estimation, carrier phase recovery, nonlinear equalization, and linear equalization...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489454/spatiotemporal-dual-periodic-soliton-pulsation-in-a-multimode-fiber-laser
#17
JOURNAL ARTICLE
Wen-Yao He, Guang-Xin Liu, Jia-Wen Wu, Ye-Ting Qin, Zhi-Yin Feng, Guang-Xin Zhang, Wen-Jun Li, Hu Cui, Zhi-Chao Luo, Wen-Cheng Xu, Ai-Ping Luo
Spatiotemporal mode-locked (STML) fiber lasers have become a new platform for investigating nonlinear phenomena. In this work, spatiotemporal dual-periodic soliton pulsation (SDSP) is firstly observed in an STML fiber laser. It is found that in the SDSP, the long-period pulsations (LPPs) of different transverse modes are synchronous, while the short-period pulsations (SPPs) exhibit asynchronous modulations. The numerical simulation confirms the experimental results and further reveals that the proportion of transverse mode components can manipulate the periods of the LPP and SPP but does not affect the synchronous and asynchronous pulsations of different transverse modes...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489453/interference-induced-generation-of-a-chirp-free-short-isolated-attosecond-pulse-in-the-water-window-region-with-multicolor-laser-fields
#18
JOURNAL ARTICLE
Jin-Xu Du, Guo-Li Wang, Xuan-Hong Gao, Xiao-Yong Li, Zhi-Hong Jiao, Song-Feng Zhao, Xiao-Xin Zhou
Compensating for the intrinsic attosecond chirp (atto-chirp) of wideband high-order harmonics in the water window region is a significant challenge, in order to obtain isolated attosecond pulses (IAPs) with a width of tens of attoseconds (as). Here, we propose to realize the generation of IAP with duration as short as 20 as, central energy of 365 eV, and bandwidth exceeding 150 eV from chirp-free high harmonics generated by a four-color driving laser, without the necessity for atto-chirp compensation with natural materials...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489452/coverage-extended-mmf-based-indoor-owc-using-overfilled-launch-and-diversity-reception
#19
JOURNAL ARTICLE
Jin Shi, Yuzhe Wang, Xinda Yan, Zhengying Li, Eduward Tangdiongga
Speckle patterns generated as coherent optical beams are reflected by scattering elements. Multimode fibers (MMFs) can modify the transverse intensity distribution of speckle patterns with macro perturbations, i.e., pressures, providing a simple and low-cost way to achieve equivalent beam-steering for indoor optical wireless communications (OWCs) with divergent optical beams. However, the received optical power (ROP) variance severely limits the mobility of user terminals. In this paper, the issue is alleviated by using the overfilled launch of MMFs and the diversity gain of multi-receivers...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489451/quantifying-distortion-in-time-correlated-single-photon-counting-a-universal-parameter
#20
JOURNAL ARTICLE
Angela Bovolenta, Alessandro Cominelli, Giulia Acconcia, Ivan Rech
One major drawback of the classic time-correlated single photon counting (TCSPC) technique is pileup-related distortion. To keep it under a reasonable level, the maximum count rate has to be reduced, posing a serious limitation to the overall measurement speed. This means that there is an intrinsic trade-off between speed and distortion: either count rate is raised, but distortion is worsened, or distortion is minimized at the expense of speed. In both cases, it is impossible to precisely evaluate the degree of distortion introduced...
March 15, 2024: Optics Letters
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