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  • Optica Publishing Group  (26)
  • 2020-2024  (26)
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  • Optica Publishing Group  (26)
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  • 2020-2024  (26)
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  • 1
    Online-Ressource
    Online-Ressource
    A versatile multi-tone laser system for manipulating atomic qubits based on a fiber Mach–Zehnder modulator and second harmonic generation
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 17 ( 2022-08-15), p. 30098-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 17 ( 2022-08-15), p. 30098-
    Kurzfassung: Stimulated Raman transition is a fundamental method to coherently manipulate quantum states in different physical systems. Phase-coherent dichromatic radiation fields matching the energy level splitting are the key to realizing stimulated Raman transition. Here we demonstrate a flexible-tuning, spectrum-clean and fiber-compatible method to generate a highly phase-coherent and high-power multi-tone laser. This method features the utilization of a broadband fiber Mach–Zehnder modulator working at carrier suppression condition and second harmonic generation. We generate a multi-tone continuous-wave 532 nm laser with a power of 1.5 Watts and utilize it to manipulate the spin and motional states of a trapped 171 Yb + ion via stimulated Raman transition. For spin state manipulation, we acquire an effective Rabi frequency of 2π × 662.3 kHz. Due to the broad bandwidth of the fiber modulator and nonlinear crystal, the frequency gap between tones can be flexibly tuned. Benefiting from the features above, this method can manipulate 171 Yb + and 137 Ba + simultaneously in the multi-species ion trap and has potential to be widely applied in atomic, molecular and optical physics.
    Materialart: Online-Ressource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.462737
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2022
    ZDB Id: 1491859-6
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Heterodyne detection of backscattering for whispering-gallery-mode sensors
    Optica Publishing Group ; 2022
    In:  Optics Letters Vol. 47, No. 15 ( 2022-08-01), p. 3944-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 47, No. 15 ( 2022-08-01), p. 3944-
    Kurzfassung: Whispering-gallery-mode (WGM) microcavities have shown significant applications in nanoparticle sensing for environmental monitoring and biological analysis. However, the enhancement of detection resolution often calls for active cavities or elaborate structural designs, leading to an increase of fabrication complexity and cost. Herein, heterodyne amplification is implemented in WGM microsensors based on backscattering detection mechanism. By interfering with an exotic reference laser, the reflecting light backscattered by perturbation targets can be strongly enlarged, yielding an easy-to-resolve and consequently sensitive microsensor. The dependence of detection laser frequency has also been characterized with the assistance of optothermal dynamics. We show that exploiting heterodyne interferometry boosts the detection of weak signals in microresonator systems and provides a fertile ground for optical microsensor development.
    Materialart: Online-Ressource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.468937
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2022
    ZDB Id: 243290-0
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Online-Ressource
    Online-Ressource
    Quantum frequency conversion from ultraviolet to visible band through waveguides in a period-poled MgO:LiTaO 3 crystal
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 23 ( 2021-11-08), p. 38488-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 23 ( 2021-11-08), p. 38488-
    Kurzfassung: In research on hybrid quantum networks, visible or near-infrared frequency conversion has been realized. However, technical limitations mean that there have been few studies involving the ultraviolet band, and unfortunately the wavelengths of the rare-earth or alkaline-earth metal atoms or ions that are used widely in research on quantum information are often in the UV band. Therefore, frequency conversion of the ultraviolet band is very important. In this paper, we demonstrate a quantum frequency conversion between ultraviolet and visible wavelengths by fabricating waveguides in a period-poled MgO:LiTaO 3 crystal with a laser writing system, which will be used to connect the wavelength of the dipole transition of 171 Yb + at 369.5 nm and the absorption wavelength of Eu 3+ at 580 nm in a solid-state quantum memory system. An external conversion efficiency of 0.85% and a signal-to-noise ratio of greater than 500 are realized with a pumping power of 3.28 W at 1018 nm. Furthermore, we complete frequency conversion of the classical polarization state by means of a symmetric optical setup based on the fabricated waveguide, and the process fidelity of the conversion is (96.13 ± 0.021)%. This converter paves the way for constructing a hybrid quantum network and realizing a quantum router in the ultraviolet band in the future.
    Materialart: Online-Ressource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.439513
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2021
    ZDB Id: 1491859-6
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  • 4
    Online-Ressource
    Online-Ressource
    Concise fractional Fourier transform based on a non-uniform order searching method for estimating physical parameters from Newton’s rings
    Optica Publishing Group ; 2022
    In:  Applied Optics Vol. 61, No. 15 ( 2022-05-20), p. 4478-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 61, No. 15 ( 2022-05-20), p. 4478-
    Kurzfassung: Newton’s ring pattern is very common in interferometry. By analyzing it, the physical parameters can be estimated, such as the curvature radius and the rings’ center. However, parameter estimation from large images using fractional Fourier transform (FRFT) consumes considerable time. A concise FRFT based on a non-uniform order searching method is proposed to reduce the computational time without decreasing the accuracy. Experimental results show that the time of the proposed method is about 2.7 s, which is about 1/600 of that of the traditional FRFT-based method and 1/5 of that of the Fast FRFT-based method when processing 960 × 960 pixel images.
    Materialart: Online-Ressource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.457830
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2022
    ZDB Id: 207387-0
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  • 5
    Online-Ressource
    Online-Ressource
    Convolutional neural network for estimating physical parameters from Newton’s rings
    Optica Publishing Group ; 2021
    In:  Applied Optics Vol. 60, No. 13 ( 2021-05-01), p. 3964-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 60, No. 13 ( 2021-05-01), p. 3964-
    Kurzfassung: By analyzing Newton’s rings, often encountered in interferometry, the parameters of spherical surfaces such as the rings’ center and the curvature radius can be estimated. First, the classical convolutional neural networks,  visual geometry group (VGG) network and U-Net, are applied to parameter estimation of Newton’s rings. After these models are trained, the rings’ center and curvature radius can be obtained simultaneously. Compared with previous analysis methods of Newton’s rings, it is shown that the proposed method has higher precision, better immunity to noise, and lower time consumption. For a Newton’s rings pattern of 640 × 480 pixels comprising − 5 d B Gaussian noise or 60% salt-and-pepper noise, the parameters can be estimated by the VGG model in 0.01 s, the error of the rings’ center is less than one pixel, and the error of curvature radius is lower than 0.5%.
    Materialart: Online-Ressource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.422012
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2021
    ZDB Id: 207387-0
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  • 6
    Online-Ressource
    Online-Ressource
    Probabilistic neural network equalizer for nonlinear mitigation in OAM mode division multiplexed optical fiber communication
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 26 ( 2022-12-19), p. 47957-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 26 ( 2022-12-19), p. 47957-
    Kurzfassung: Orbital angular momentum (OAM) mode-division multiplexing (MDM) is a key technique to achieve ultra-high-capacity optical fiber communications. However, the high nonlinear impairment from optoelectronic devices, such as spatial light modulators, modulators, and photodiodes, is a long-standing challenge for OAM-MDM. In this paper, an equalizer based on a probabilistic neural network (PNN) is presented to mitigate the nonlinear impairment for an OAM-MDM fiber communication system with 32 GBaud Nyquist pulse amplitude modulation-8 (PAM8) intensity-modulation direct-detection (IM-DD) signals. PNN equalizer can calculate the distribution of the nonlinearity using Bayesian decision theory and thus mitigate the stochastic nonlinear impairment of the received signal. Experimental results show that compared with the convolutional neural network (CNN) equalizer, the PNN equalizer improves the receiver sensitivity by 0.6dB and 2dB for two OAM modes with l  = + 3 and l  = + 4 at the 20% FEC limit, respectively. Moreover, compared with Volterra or CNN equalizers, the PNN equalizer can reduce the computation complexity significantly, which has great potential to mitigate the nonlinear signal distortions in high-speed IM-DD OAM-MDM fiber communication systems.
    Materialart: Online-Ressource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.456908
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2022
    ZDB Id: 1491859-6
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    400 Gbit/s 4 mode transmission for IM/DD OAM mode division multiplexing optical fiber communication with a few-shot learning-based AffinityNet nonlinear equalizer
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 14 ( 2023-07-03), p. 22622-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 14 ( 2023-07-03), p. 22622-
    Kurzfassung: Nonlinear impairment in a high-speed orbital angular momentum (OAM) mode-division multiplexing (MDM) optical fiber communication system presents high complexity and strong stochasticity due to the massive optoelectronic devices. In this paper, we propose an Affinity Network (AffinityNet) nonlinear equalizer for an OAM-MDM intensity-modulation direct-detection (IM/DD) transmission with four OAM modes. The labeled training and testing signals from the OAM-MDM system can be regarded as “small sample” and “large target”, respectively. AffinityNet can be used to build an accurate nonlinear model using “small sample” based on few-shot learning and can predict the stochastic characteristic nonlinearity of OAM-MDM with a high level of generalization. As a result, the AffinityNet nonlinear equalizer can effectively compensate the stochastic nonlinearity in the OAM-MDM system, despite the large difference between the training and testing signals due to the stochastic nonlinear impairment. An experiment was conducted on a 400 Gbit/s transmission with four OAM modes using a pulse amplitude modulation-8 (PAM-8) signal over a 2 km ring-core fiber (RCF). Our experimental results show that the proposed nonlinear equalizer outperformed the conventional Volterra equalizer with improvements in receiver sensitivity of 1.7, 1.8, 3, and 3.3 dB for the four OAM modes at the 15% forward error correction (FEC) threshold, respectively. In addition, the proposed equalizer outperformed a convolutional neural network (CNN) equalizer with improvements in receiver sensitivity of 0.8, 0.5, 0.9, and 1.4 dB for the four OAM modes at the 15% FEC threshold. In the experiment, a complexity reduction of 37% and 83% of the AffinityNet equalizer is taken compared to the conventional Volterra equalizer and CNN equalizer, respectively. The proposed equalizer is a promising candidate for a high-speed OAM-MDM optical fiber communication system.
    Materialart: Online-Ressource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.492795
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2023
    ZDB Id: 1491859-6
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  • 8
    Online-Ressource
    Online-Ressource
    Chirped anti-resonant reflecting optical waveguide for the distributed sensing of pressure
    Optica Publishing Group ; 2020
    In:  Optics Letters Vol. 45, No. 3 ( 2020-02-01), p. 690-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 45, No. 3 ( 2020-02-01), p. 690-
    Kurzfassung: A chirped anti-resonant reflecting optical waveguide (ARROW) for the simultaneous measurement of pressure intensity and spatial localization has been proposed and experimentally demonstrated. An etched chirped ARROW was fabricated, which shows a chirped spectral characteristic. Additionally, an in-line Mach–Zehnder interferometer is also formed with the core mode and higher-order modes. The pressure intensity and the spatial localization can be detected by interrogating the wavelength shift of the in-line Mach–Zehnder interferometer and the chirped ARROW, respectively. The experimental results show that the pressure sensitivity of − 4.42 n m / M P a and the spatial sensitivity of 0.86 nm/cm can be achieved. The proposed fiber optic sensor can be used for multipoint pressure detection in the fields of security, structure monitoring, and oil exploration, etc.
    Materialart: Online-Ressource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.382716
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2020
    ZDB Id: 243290-0
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Online-Ressource
    Online-Ressource
    Highly polarized emission from organic single-crystal light-emitting devices with a polarization ratio of 176
    Optica Publishing Group ; 2022
    In:  Optica Vol. 9, No. 1 ( 2022-01-20), p. 121-
    Details
    In: Optica, Optica Publishing Group, Vol. 9, No. 1 ( 2022-01-20), p. 121-
    Kurzfassung: Polarized light emission from organic light-emitting devices (OLEDs) is of considerable current interest because of their great potential in various optical and optoelectronic devices. Utilizing materials with aligned molecular orientation is a simple and promising way to realize highly polarized OLEDs; however, both the polarization ratio and efficiency are still far from the requirements for practical applications. Organic single crystals with inherent anisotropic properties induced by their long-range periodic order are ideal candidates for intrinsically polarized emission. Herein, the intrinsic polarization has been dramatically amplified by constructing a microcavity structure in organic single-crystal OLEDs to effectively couple microcavity resonance to polarized light. A high polarization ratio of 176 has been achieved from the polarized OLEDs. Moreover, highly aligned single-crystalline molecules with small tilted orientation angles to the crystal surface result in a high outcoupling efficiency for surface-emitting crystal OLEDs. A maximum luminance of 6122 c d / m 2 and current efficiency of 1.86 cd/A were achieved, which are among the best performances for crystal OLEDs. This work may lead to a new strategy for simultaneously enhancing the polarization ratio and efficiency of polarized OLEDs and promote their development in various optical and optoelectronic applications.
    Materialart: Online-Ressource
    ISSN: 2334-2536
    URL: Article
    DOI: 10.1364/OPTICA.442016
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2022
    ZDB Id: 2779175-0
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  • 10
    Online-Ressource
    Online-Ressource
    Modulation-format-independent in-band OSNR monitoring technique using Gaussian process regression for a Raman amplified multi-span system with a cascaded filtering effect
    Optica Publishing Group ; 2020
    In:  Optics Express Vol. 28, No. 7 ( 2020-03-30), p. 10134-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 28, No. 7 ( 2020-03-30), p. 10134-
    Kurzfassung: We propose and experimentally demonstrate an accurate modulation-format-indepen-dent and cascaded filtering effect (CFE) insensitive in-band optical signal-to-noise ratio (OSNR) monitoring technique enabled by Gaussian process regression (GPR) utilizing a widely tunable optical bandpass filter (OBPF) and optical power measurements. By adjusting the center frequency of a widely tunable OBPF and measuring the corresponding output optical power as the input features of GPR, the proposed OSNR monitoring technique is experimentally proven to be transparent to modulation formats and robust to CFE, chromatic dispersion (CD), polarization mode dispersion (PMD), and nonlinear effect (NLE). Experimental results for 9-channel 32Gbaud PDM-16QAM signals with 50GHz channel spacing demonstrate OSNR monitoring with the root mean squared error (RMSE) of 0.429 dB and the mean absolute error (MAE) of 0.294 dB, in the OSNR range of -1∼30 dB. Even better, our proposed technique has the potential to be employed for link monitoring at the intermediation nodes and can eliminate the necessity to know the transmission information.
    Materialart: Online-Ressource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.387668
    Sprache: Englisch
    Verlag: Optica Publishing Group
    Publikationsdatum: 2020
    ZDB Id: 1491859-6
    Standort Signatur Einschränkungen Verfügbarkeit
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