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  • Optica Publishing Group  (434)
  • 2020-2024  (434)
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  • Optica Publishing Group  (434)
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  • 2020-2024  (434)
Year
  • 1
    Online Resource
    Online Resource
    Modeling of a multi-parameter chaotic optoelectronic oscillator based on the Fourier neural operator
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 25 ( 2022-12-05), p. 44798-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 25 ( 2022-12-05), p. 44798-
    Abstract: A model construction scheme of chaotic optoelectronic oscillator (OEO) based on the Fourier neural operator (FNO) is proposed. Different from the conventional methods, we learn the nonlinear dynamics of OEO (actual components) in a data-driven way, expecting to obtain a multi-parameter OEO model for generating chaotic carrier with high-efficiency and low-cost. FNO is a deep learning architecture which utilizes neural network as a parameter structure to learn the trajectory of the family of equations from training data. With the assistance of FNO, the nonlinear dynamics of OEO characterized by differential delay equation can be modeled easily. In this work, the maximal Lyapunov exponent is applied to judge whether these time series have chaotic behavior, and the Pearson correlation coefficient ( PCC ) is introduced to evaluate the modeling performance. Compare with long and short-term memory (LSTM), FNO is not only superior to LSTM in modeling accuracy, but also requires less training data. Subsequently, we analyze the modeling performance of FNO under different feedback gains and time delays. Both numerical and experimental results show that the PCC can be greater than 0.99 in the case of low feedback gain. Next, we further analyze the influence of different system oscillation frequencies, and the generalization ability of FNO is also analyzed.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.474053
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 2
    Online Resource
    Online Resource
    Holographic near-eye display system with large viewing area based on liquid crystal axicon
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 19 ( 2022-09-12), p. 34106-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 19 ( 2022-09-12), p. 34106-
    Abstract: In this paper, a liquid crystal axicon based holographic near-eye display system with large viewing area is proposed. The viewing area of the system is extended by implementing the liquid crystal axicon. The error diffusion algorithm is used to calculate the computer-generated hologram (CGH). When incident on the liquid crystal axicon placed at the back focal plane of Fourier lens, the reconstruction light modulated by the CGH is deflected into two directions resulting in a viewing area extension. Meanwhile, to illustrate the potential of the proposed system, two-dimensional viewing area extension is demonstrated. It combines the frequency spectrum shift with the proposed system and achieves a double expansion of the horizontal viewing area and three-times expansion of the vertical viewing area. Feasibility of the proposed system is verified by optical experiments. The proposed system has potential applications in holographic augmented reality (AR) display.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.468078
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    Switching of lasing direction in reconfigurable chiral photonic crystals
    Optica Publishing Group ; 2023
    In:  Optical Materials Express Vol. 13, No. 6 ( 2023-06-01), p. 1555-
    Details
    In: Optical Materials Express, Optica Publishing Group, Vol. 13, No. 6 ( 2023-06-01), p. 1555-
    Abstract: In recent years, the development of lasers using photonic crystals as resonant cavities has emerged and continued to grow. These photonic crystal lasers offer the advantages of reduced threshold levels and compact dimensions. Chiral liquid crystals (CLCs) are self-assembled one-dimensional photonic crystals that enable a wide range of photonic crystal lasers to exhibit broad wavelength tuning capabilities. Our research exploits the uniform standing helix (USH) and uniform lying helix (ULH) states of CLCs as resonant cavities; therefore, the direction of laser emission of CLC lasers can be changed by switching between USH and ULH states. Both USH and ULH lasers in CLCs also exhibit wavelength tuning. The USH laser induces a blue shift in the laser wavelength by dielectric heating, while the ULH laser achieves a redshift of the laser wavelength by applying a vertical electric field to lengthen the helical pitch. Such a reconfigurable chiral photonic crystal laser based on the CLCs provides bidirectional switching of the laser direction while maintaining the ability to tune the wavelength, so it has the potential for use in photonic applications.
    Type of Medium: Online Resource
    ISSN: 2159-3930
    URL: Article
    DOI: 10.1364/OME.491580
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 2619914-2
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  • 4
    Online Resource
    Online Resource
    Trading off security and practicability to explore high-speed and long-haul chaotic optical communication
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 8 ( 2021-04-12), p. 12750-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 8 ( 2021-04-12), p. 12750-
    Abstract: Recent demonstrations of chaos-based secure communication have proven the feasibility of secured transmission of high-speed (tens of Gbit/s) signals over certain distances (∼100-km), which bring hope for secure communication from theoretical analysis to practical applications. So far, the chaos-based secure communication system with chaos-masking (CMS) encryption is considered as one of the most important and feasible schemes. In this paper, an optical chaotic carrier generated by an opto-electronic oscillator is used to encrypt 112-Gbit/s message by CMS encryption for data transmission over a 1040-km single-mode-fiber. The message is successfully decrypted by combining coherent detection and our proposed blind decryption algorithms, which can successfully separate the chaotic carrier and the message with the bit-error-rate (BER) below the forward error correction (FEC) threshold. Experimental results show that the coherent detection combined digital signal processing algorithms may be a possible way to promote the practical applications of chaotic optical communication in the future. In addition, this paper reveals that the security of the CMS encryption may be not high enough for those systems requiring rigorous confidentiality. Subsequently, we further discuss the bottlenecks encountered in current high-speed chaotic optical communication systems and analyze how to improve and weight the security and practicability.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.423098
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Curved hologram generation method for speckle noise suppression based on the stochastic gradient descent algorithm
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 26 ( 2021-12-20), p. 42650-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 26 ( 2021-12-20), p. 42650-
    Abstract: In this paper, a curved hologram generation method with suppressed speckle noise is proposed. In the process of generating the curved hologram, the angle spectrum method is used to calculate the 3D object in layers. By analyzing the loss function relationship between the diffraction image of the curved hologram and the target light field, the loss function is calculated. The phase of the hologram is updated based on the stochastic gradient descent algorithm, thereby obtaining the optimal phase distribution of the curved hologram. When the curved hologram is reproduced at different bending center angles, the reconstructed image of the corresponding angle can be seen. The proposed method has obvious advantages compared with the error diffusion method and Fresnel diffraction algorithm. The feasibility of the proposed method is verified by the experiments.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.444321
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    Method of color holographic display with speckle noise suppression
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 14 ( 2022-07-04), p. 25647-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 14 ( 2022-07-04), p. 25647-
    Abstract: In this paper, a method of color holographic display with speckle noise suppression is proposed. Firstly, the intensity information of the object is extracted according to the red, green and blue (RGB) channels. The band-limited phase is calculated and used as the initial phase for each color channel. Secondly, the double-step Fresnel diffraction algorithm is used to calculate the computer-generated holograms (CGHs), and a filter plane that dynamically adjusts the position of the filter in the optical path is designed. Then, a divergent spherical phase factor is added to the CGHs. Finally, the time average method is used to further reduce the speckle noise. When the CGHs of the RGB channels are loaded on the digital micromirror device and illuminated by the RGB lights emitting in a temporal sequence, the color reconstructed images with speckle noise suppression can be displayed. The validity of the proposed method is verified.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.461294
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
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  • 7
    Online Resource
    Online Resource
    Experimental quantum simulation of dynamic localization on curved photonic lattices
    Optica Publishing Group ; 2022
    In:  Photonics Research Vol. 10, No. 6 ( 2022-06-01), p. 1430-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 10, No. 6 ( 2022-06-01), p. 1430-
    Abstract: Dynamic localization, which originates from the phenomena of particle evolution suppression under an externally applied AC electric field, has been simulated by suppressed light evolution in periodically curved photonic arrays. However, experimental studies on their quantitative dynamic transport properties and application for quantum information processing are rare. Here we fabricate one-dimensional and hexagonal two-dimensional arrays both with sinusoidal curvatures. We successfully observe the suppressed single-photon evolution patterns, and for the first time, to the best of our knowledge, measure the variances to study their transport properties. For one-dimensional arrays, the measured variances match both the analytical electric-field calculation and the quantum walk Hamiltonian engineering approach. For hexagonal arrays as anisotropic effective couplings in four directions are mutually dependent, the analytical approach suffers, whereas quantum walk conveniently incorporates all anisotropic coupling coefficients in the Hamiltonian and solves its exponential as a whole, yielding consistent variances with our experimental results. Furthermore, we implement a nearly complete localization to show that it can preserve both the initial injection and the wave packet after some evolution, acting as a memory of a flexible time scale in integrated photonics. We demonstrate a useful quantum simulation of dynamic localization for studying their anisotropic transport properties and a promising application of dynamic localization as a building block for quantum information processing in integrated photonics.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.439637
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2724783-1
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  • 8
    Online Resource
    Online Resource
    High-fidelity, low-latency polarization quantum state transmissions over a hollow-core conjoined-tube fiber at around 800  nm
    Optica Publishing Group ; 2021
    In:  Photonics Research Vol. 9, No. 4 ( 2021-04-01), p. 460-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 9, No. 4 ( 2021-04-01), p. 460-
    Abstract: Hollow-core fiber (HCF) promises to unify air-borne light propagation and non-line-of-sight transmission, thus holding great potential for versatile photonics-based quantum information applications. The early version of HCF based on photonic-bandgap guidance has not proven itself a reliable quantum channel because of the poor modal purity in both spatial and polarization domains, as well as significant difficulty in fabrication when the wavelength shifts to the visible region. In this work, based on the polarization degree of freedom, we demonstrate high-fidelity ( ∼ 0.98 ) single-photon transmission and distribution of entangled photons over a 36.4 m hollow-core conjoined-tube fiber (CTF) by using commercial silicon single-photon avalanche photodiodes. Our CTF realizes the combined merits of low loss, high spatial modal purity, low polarization degradation, and low chromatic dispersion. We also demonstrate single-photon low-latency ( ∼ 99.96 % speed of light in vacuum) transmission, paving the way for extensive uses of HCF links in versatile photonics-based quantum information processing.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.409521
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 9
    Online Resource
    Online Resource
    Integrated scanning spectrometer with a tunable micro-ring resonator and an arrayed waveguide grating
    Optica Publishing Group ; 2022
    In:  Photonics Research Vol. 10, No. 5 ( 2022-05-01), p. A74-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 10, No. 5 ( 2022-05-01), p. A74-
    Abstract: Integrated spectrometers with both wide optical bandwidths and high spectral resolutions are required in applications such as spectral domain optical coherence tomography (SD-OCT). Here we propose a compact integrated scanning spectrometer by using a tunable micro-ring resonator (MRR) integrated with a single arrayed waveguide grating for operation in the 1265–1335-nm range. The spectral resolution of the spectrometer is determined by the quality factor of the MRR, and the optical bandwidth is defined by the free spectral range of the arrayed waveguide grating. The spectrometer is integrated with on-chip germanium photodetectors, which enable direct electrical readout. A 70-nm optical bandwidth and a 0.2-nm channel spacing enabled by scanning the MRR across one free spectral range are demonstrated, which offer a total of 350 wavelength channels with 31-kHz wavelength scanning speed. The integrated spectrometer is applied to measure different spectra and the interference signals from an SD-OCT system, which shows its great potential for future applications in sensing and imaging systems.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.443039
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
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  • 10
    Online Resource
    Online Resource
    Investigation on reliability of red micro-light emitting diodes with atomic layer deposition passivation layers
    Optica Publishing Group ; 2020
    In:  Optics Express Vol. 28, No. 25 ( 2020-12-07), p. 38184-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 28, No. 25 ( 2020-12-07), p. 38184-
    Abstract: In this study, AlGaInP red light emitting diodes with sizes ranging from 5 to 50 micrometers were fabricated and characterized. The atomic layer deposition technology is applied to coat a layer of silicon dioxide for passivation and protection. The top emission area is covered by ITO layer to maximize the optical output. From the optical measurement, the linewidth and emission peaks shift very little among different current levels (from 30 to 150 A/cm 2 ). High current level lifetests are performed and a 15 µm ALD device can last 27 hours of continuous operation at 100 A/cm 2 before their diode junction failed. A much shorter lifetime of 5.32 hours was obtained when the driving current is raised to 400 A/cm 2 . When the same condition was applied to 15 µm PECVD devices, 25 hours and 4.33 hours are registered for 100 A/cm 2 and 400 A/cm 2 tests, respectively. The cross-sectional SEM reveals the voids, defects, and dark lines developed during the aging tests, and most of them are caused by top contact failure. The surface layers of ITO and SiO 2 were melted and the dark lines which were originated from the top surface propagated through the device and led to the eventual failure of the diode. The optical intensity degradation slopes of different sizes of devices indicate a large device can last longer in this accelerated aging test. The efficiencies of the devices are also evaluated by the ABC model and the fitted bimolecular coefficient ranges from 1.35 to 3.40×10 −10 cm 3 /s.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.411591
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
    detail.hit.zdb_id: 1491859-6
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