Article
Optics
Yunhao Zhu, Wei Li, Fuyu Gao, Xiaobin Xu, Ningfang Song
Summary: In this study, the hybrid photonic bandgap effect in twisted hollow-core photonic bandgap fibers (HC-PBFs) is investigated for the first time. The twisting of the fibers changes the effective refractive index and eliminates the degeneracy of the photonic bandgap ranges. This twist-induced effect shifts the center wavelength and narrows the bandwidth of the transmission spectrum. The twisted HC-PBFs exhibit quasi-single-mode low-loss transmission and are suitable for applications such as spectral and mode filters.
Article
Optics
K. Lee, J. Jung, J. H. Lee
Summary: This article reports the theoretical and experimental investigation results of generating polarization-entangled photon pairs at visible wavelengths. The generation was based on intermodal spontaneous four-wave mixing using standard step-index few-mode fiber. Theoretical analysis showed that different combinations of intermodal spontaneous four-wave mixing processes could occur based on the spatial modes of the pump beam. Experimental results demonstrated the successful creation of a polarization-entangled photon pair source by incorporating a segment of few-mode fiber in a Sagnac loop. The visibility of two-photon interference fringes of the implemented source was 91.7% and 88.8% in H/V bases and D/A bases, respectively. Furthermore, a quantum state tomography was conducted to reconstruct the density matrix of the generated state with a fidelity to a maximum entangled state of 93.1%.
LASER PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Eric Numkam Fokoua, Wenwu Zhu, Meng Ding, Zitong Feng, Yong Chen, Thomas D. Bradley, Gregory T. Jasion, David J. Richardson, Francesco Poletti, Radan Slavik
Summary: Hollow-core optical fibers convey light in air, showing remarkably low sensitivity of the propagation delay to temperature changes, especially in photonic bandgap type. The residual variation in propagation delay observed near the zero sensitivity wavelength has no apparent correlation to imposed temperature changes. Practical thermal stability of latency is limited by polarization mode dispersion, with strong polarization mode coupling observed in addition to birefringence.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Applied
Li-Guo Qin, Guo-Dong Yan, Jie-Hui Huang, Li-Li Wang, Hui-Ping Wang, Zhong-Yang Wang, Shang-Qing Gong
Summary: Future quantum networks will require reversible coherent conversion and modulation between microwave and optical photons to combine the quantum information-processing ability of microwaves with the long-distance distribution capability of optical photons. A scheme of bi-directional phase controllable four-wave mixing between microwave and optical fields has been presented, utilizing a nanomechanical optomechanical resonator as an intermediate interface. This hybrid optomechanical system offers potential for electro-optic modulation and a broad range of applications in optical communications and quantum networks.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Duo Yi, Man Su, Xiaoling Tan, Youfu Geng, Xuejin Li, Lina Wang, Xueming Hong
Summary: The paper presents a four-wave mixing-based photonic crystal fiber microfluid sensor with U-shape microslits fabricated by a femtosecond laser for real-time microfluid measurement. The signal wavelength is sensitive to both the refractive index and material dispersion property of the liquid sample, showing potential for discrimination of liquid samples with a well-designed wavelength-coded sensor array. The proposed sensor demonstrates high sensitivity and resolution, as well as a better figure of merit compared to fiber SPR sensors.
Article
Optics
M. Huang, D. Wu, H. Ren, L. Shen, T. W. Hawkins, J. Ballato, U. J. Gibson, M. Beresna, R. Slavik, J. E. Sipe, M. Liscidini, A. C. Peacock
Summary: Undetected-photon imaging technique is demonstrated using light generated via stimulated four-wave mixing within highly nonlinear silicon fiber waveguides. The achieved high spatial and phase correlation of the system allows for high contrast and stable images.
PHOTONICS RESEARCH
(2023)
Article
Optics
Jisoo Kim, Bumjoon Jang, Torsten Wieduwilt, Stephen C. Warren-Smith, Johannes Burger, Stefan A. Maier, Markus A. Schmidt
Summary: This work demonstrates the potential of the optofluidic light cage concept for on-chip fluorescence spectroscopy. The fluorescence light generated in the core of a nanoprinted dual-ring light cage can be efficiently captured and guided to the waveguide ports. This innovative photonic platform shows promise for integrated on-chip spectroscopic devices in various fields.
Article
Optics
Mohamed Mohsen H. Mahmoud, B. M. Younis, Nihal F. F. Areed, Mohamed Farhat O. Hameed, S. S. A. Obayya
Summary: This study presents a compact mode converter based on ADC-PCF infiltrated with NLC, achieving high wavelength selectivity with a short device length. It demonstrates thermal tunability under different temperature levels, showcasing its potential for efficient use in integrated photonic circuits.
Article
Optics
Esam A. A. Hagras, Mohamed Farhat O. Hameed, S. S. A. Obayya
Summary: A compact terahertz dual core photonic crystal fiber polarization splitter is presented, which utilizes a nematic liquid crystal (NLC) of type E7 to achieve high birefringence. The design uses TOPAS as the background material and investigates the impact of geometric parameters and the temperature dependence of the NLC on the splitter's performance. The numerical results show a device length of 3.848 cm with low crosstalk and a large bandwidth of 58 GHz. The design is less sensitive to fabrication perturbations and has potential for THz applications.
Article
Engineering, Electrical & Electronic
Yong You, Yan-Ge Liu, Yundong Hao, Huiyi Guo, Zhi Wang
Summary: The study focused on the surface modes (SMs) in hollow-core photonic bandgap fiber (HC-PBF) and their impact on fiber performance, naming the SMs and studying their characteristics such as mode field shape, coupling bandwidth, and coupling speed. The study compared coupling characteristics of SMs with different core diameters and validated the theoretical analysis with actual fiber, aiming to deepen understanding of HC-PBF and positively impact its development.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Linqiao Gan, Fei Yu, Yazhou Wang, Ning Wang, Xinyue Zhu, Lili Hu, Chunlei Yu
Summary: In this paper, the application of a deep learning neural network (DNN) in the dispersion-oriented inverse design of photonic-crystal fiber (PCF) for four-wave mixing (FWM) fine-tuning is demonstrated. A large dataset of phase-matching curves of various PCF designs is generated using the empirical formula of PCF dispersion instead of numerical simulation, significantly improving the accuracy of the DNN prediction. The accuracies of DNNs' predicted PCF structure parameters are all above 95%. The simulations of the DNN-predicted PCFs structure show that the FWM wavelength has an average numerical mean square error (MAE) of 1.92 nm from the design target. With the assistance of DNN, a specific PCF for wavelength conversion from 1064 nm to 770 nm is designed and fabricated for biomedical imaging applications, with the signal wavelength measured at 770.2 nm.
Article
Engineering, Electrical & Electronic
Yundong Hao, Huiyi Guo, Yong You, Zhi Wang, Yan-Ge Liu
Summary: This article presents a novel hollow-core hybrid cladding fiber (HC-HBCF) which combines the anti-resonant and photonic bandgap guidance mechanisms to achieve reduced mode confinement loss. The HC-HBCF exhibits low scattering loss, excellent spectral flatness, and strong bending characteristics.
IEEE PHOTONICS JOURNAL
(2023)
Article
Optics
Md Selim Habib, Abubakar Adamu, Christos Markos, Rodrigo Amezcua-Correa
Summary: The proposed hollow-core anti-resonant fiber design based on hybrid silica/silicon cladding achieves single-polarization, single-mode, and high birefringence. The optimized design shows low propagation loss and high birefringence for y-polarization, making it suitable for applications in the field of optical fiber communications.
Article
Physics, Applied
Hisaya Oda, Youhei Hosokawa, Kazuki Hayashi, Nobuhiko Ozaki, Naoki Ikeda, Yoshimasa Sugimoto
Summary: We achieved wide-band wavelength conversion through four-wave mixing in W3-type AlGaAs photonic crystal waveguides. The large third-order nonlinearity of AlGaAs and its large bandgap in the 1550 nm range enabled us to avoid two-photon absorption. We obtained a four-wave mixing efficiency of -7 dB for a pump peak power of 7 W, and a conversion bandwidth greater than 38 nm with a conversion efficiency of -22 dB by utilizing the two even guided bands of the W3-type photonic crystal waveguide.
APPLIED PHYSICS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Dong Wu, Li Shen, Haonan Ren, Meng Huang, Cosimo Lacava, Joseph Campling, Shiyu Sun, Thomas W. Hawkins, Ursula J. Gibson, Periklis Petropoulos, John Ballato, Anna C. Peacock
Summary: Silicon core fibers have shown promise for nonlinear signal processing, with advancements in parametric amplification, wavelength conversion, and all-optical signal processing, showcasing their potential for future telecommunications systems.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
