Article
Engineering, Electrical & Electronic
Fan Wang, Yundong Zhang, Yanchen Qu, Siyu Lin, Xiaopeng Han
Summary: A novel scheme utilizing fast and slow light in a fiber resonator is proposed and experimentally demonstrated for improving the resolution of a temperature sensor. The sensor converts the temperature-induced resonance wavelength shift into significant delay time variations, allowing for high-temperature sensitivity. Unlike traditional spectrum tracing methods, temperature detection is carried out using an oscilloscope, resulting in fast response and high resolution. The sensitivity, resolution, and measurement range of the sensor can be easily adjusted by changing the resonator's Q-factor. Temperature measurements at fiber resonators with low-Q and high-Q demonstrate a resolution of 3.76 x 10(-4) degrees C and a sensitivity of 2706 ns/ degrees C. This scheme offers a simple and easily implementable solution for detecting minuscule temperature changes.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yi Xu, Wenjing Liu
Summary: This study investigates Fano resonance and slow-to-fast light conversion in a Laguerre-Gaussian rovibrational cavity. By adjusting the frequency detuning, Fano resonances are observed and double Fano resonances are observed for different vibrational and rotational frequencies. The same setup can be used to achieve both slow and fast light conversion by controlling the topological charge value and the frequency detuning.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Chen Zhu, Xinglin Sun
Summary: This paper proposes and demonstrates a method for manipulating group velocity in a two-beam Mach-Zehnder interferometer in the radio frequency regime. The method allows for control of the group velocity at the resonance frequency without changing the length of the interferometer. The effectiveness of the method is verified through numerical calculations and experimental measurements.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Physics, Multidisciplinary
C. Goyon, M. R. Edwards, T. Chapman, L. Divol, N. Lemos, G. J. Williams, D. A. Mariscal, D. Turnbull, A. M. Hansen, P. Michel
Summary: The article describes how ion-acoustic response in a fully ionized plasma can lead to large and measurable changes in the group velocity of light, with the first experimental demonstration of slow and fast light in a plasma, measuring group velocities between 0.12c and -0.34c.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Thomas Zacharias, Liran Hareli, Alon Bahabad
Summary: Slow and fast light refer to light pulses moving at group velocities slower or faster than the speed of light in vacuum. Different methods have been developed to achieve slow and fast light, with the latest involving superoscillations and weak measurements of arrival time, allowing for applications in various fields such as telecommunication, interferometry, and laser radars.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Jacob B. Khurgin, Matteo Clerici, Nathaniel Kinsey
Summary: The optical nonlinearity of epsilon-near-zero (ENZ) media, focusing on transparent conducting oxides, is analyzed to clarify its unique properties and commonalities with other nonlinear media. Despite not surpassing traditional materials in strength, ENZ materials offer key advantages in terms of response time, slow light enhancement, and broadband nature, making them a valuable tool for ultrafast photonics applications.
LASER & PHOTONICS REVIEWS
(2021)
Article
Physics, Multidisciplinary
S. K. Singh, M. Parvez, T. Abbas, Jia-Xin Peng, M. Mazaheri, Muhammad Asjad
Summary: In this study, we theoretically investigate the tunable optical response of a weak probe field in a single phonon mechanical driven cavity optomechanical system. The external single phonon mechanical driving field can significantly affect the absorption and amplification profile of the output probe field, and the phase dispersion and group delay of the probe field can be flexibly controlled through the optomechanical coupling strengths and thermal phonon numbers.
Article
Optics
Thomas E. Maybour, Devin H. Smith, Peter Horak
Summary: A theoretical model for a dynamic Moire grating capable of producing improved slow and stopped light performance was investigated. By varying coupling strength in time, the Moire grating can significantly reduce group velocity in the slow light resonance while maintaining a wide bandwidth. This dynamic Moire grating could potentially realize bandwidth modulation and be implemented using an electro-optic grating with a quasistatic electric field in a poled chi((2)) nonlinear medium.
Article
Materials Science, Multidisciplinary
Hua-Jun Chen
Summary: This study investigates the properties of the optical output fields in a spinning optomechanical system under the condition of optomechanically induced transparency (OMIT). By controlling the amplitude and phase of the coherent phonon pump, an enhancement in OMIT and a tunable delayed probe light transmission can be achieved. Manipulating the spinning direction of the resonator leads to a tunable conversion between slow and fast light effects with the adjustment of the phase and amplitude of the phonon pump.
RESULTS IN PHYSICS
(2021)
Article
Optics
Meiyu Peng, Huilai Zhang, Qian Zhang, Tian-Xiang Lu, Imran M. Mirza, Hui Jing
Summary: We investigate optomechanics in an anti-parity-time (aPT) symmetric spinning resonator and demonstrate the realization of nonreciprocal light transmission with high isolation ratio by tuning the rotating speed to approach the exceptional point (EP) or non-Hermitian spectral degeneracy. Nonreciprocal group delay or advance is also observed near the EP. Our work provides insights into manipulating laser propagation with optomechanical EP devices and has potential implications for a wide range of aPT-symmetric effects, including aPT-symmetric phonon lasers, aPT-symmetric topological effects, and aPT-symmetric force sensing or accelerator.
Article
Physics, Multidisciplinary
A. Bertoldi, C-H Feng, D. S. Naik, B. Canuel, P. Bouyer, M. Prevedelli
Summary: We propose a method that utilizes high-finesse optical resonators for light-assisted coherent manipulation of atomic ensembles, overcoming the limit imposed by the finite response time of the cavity. The key element is to rapidly switch the interaction between atoms and the cavity field with an auxiliary control process, such as the light shift induced by an optical beam. This method is applicable to various atomic species in different configurations, and can be used to control both internal and/or external atomic degrees of freedom, opening up new possibilities in cavity-aided atom interferometry and the preparation of highly nonclassical atomic states.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Pilar Pujol-Closa, Jordi Gomis-Bresco, Samyobrata Mukherjee, J. Sebastian Gomez-Diaz, Lluis Torner, David Artigas
Summary: In symmetric planar structures with type II films, slow light in hyperbolic waveguides is associated with topological transitions in the dispersion diagram as film thickness changes, mediated by the coalescence of elliptical mode branches and anomalously ordered hyperbolic mode branches. This transition leads to the formation of a saddle point that transforms into a branch point with slow light characteristics and the appearance of ghost waves for a broad range of film thicknesses.
Article
Optics
T. I. A. N. Q. I. Xu, S. H. A. O. N. A. N. Zheng, Y. A. N. G. Qiu, X. I. N. G. Y. A. N. Zhao, Q. I. Z. E. Zhong, Y. U. A. N. Dong, L. I. A. N. X. I. Jia, T. I. N. G. Hu
Summary: Tunable slow and fast light generation in a silicon-on-insulator Fano resonator is proposed and experimentally demonstrated. The transition from slow light to fast light and from fast light to slow light is achieved by controlling the phase difference of the optical beams coupled into the resonator using a microheater. The results show the potential of this approach for on-chip optical signal processing applications.
Article
Materials Science, Ceramics
Giuseppe Mattia Lo Piccolo, Adriana Morana, Antonino Alessi, Aziz Boukenter, Sylvain Girard, Youcef Ouerdane, Franco Mario Gelardi, Simonpietro Agnello, Marco Cannas
Summary: Comparison of transmission performances of pure and doped-silica optical fibres under high-power broadband light source revealed that Al and P-doped fibres exhibit fast solarisation effect leading to degradation in UV-visible range, while Ge-doped fibres form color centers but allow visible light propagation. One of the tested pure-silica fibres remained unaffected by light exposure, while the other showed an absorption band possibly due to chlorine impurities in the silica matrix. These results suggest potential use of commercial Ge-doped and pure-silica fibres in indoor lighting and fiber-based photovoltaic devices.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Optics
Saneyuki Suyama, Toshihiko Baba
Summary: In this study, a high-efficiency slow-light grating (SLG) was developed, which selectively radiates upward. Experimentally, the emissivity was enhanced by 2-4 dB, and the roundtrip efficiency was improved by 5.4 dB. This has significant implications for light detection and ranging applications.
Article
Engineering, Electrical & Electronic
Xin Lu, Marcelo A. Soto, Li Zhang, Luc Thevenaz
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Optics
K. Markiewicz, J. Kaczorowski, Z. Yang, L. Szostkiewicz, A. Dominguez-Lopez, K. Wilczynski, M. Napierala, T. Nasilowski, L. Thevenaz
Article
Engineering, Electrical & Electronic
Simon Zaslawski, Zhisheng Yang, Luc Thevenaz
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Optics
Fan Yang, Flavien Gyger, Luc Thevenaz
Article
Optics
Simon Zaslawski, Zhisheng Yang, Luc Thevenaz
Summary: This study introduces a novel distributed measurement technique which extracts local FSBS information by measuring the frequency shift of a short optical pulse subjected to phase chirp modulation caused by harmonic FSBS oscillation. In contrast to existing techniques, this method offers higher spatial resolutions.
Article
Optics
Li Zhang, Zhisheng Yang, Lukasz Szostkiewicz, Krzysztof Markiewicz, Sergei Mikhailov, Thomas Geernaert, Etienne Rochat, Luc Thevenaz
Summary: In this paper, a long-distance distributed pressure sensing system based on a special fiber and using frequency-scanned phase-sensitive optical time-domain reflectometry is proposed. The fiber shows high pressure sensitivity and low loss, demonstrating distributed pressure sensing over a long range with high spatial resolution. The temperature response of the fiber is studied, showing the possibility of scaling the temperature sensitivity by adjusting the size of the core, while the sensing distance limit due to crosstalk between the polarization axes is also discussed.
Article
Optics
Xia Gao, Zhisheng Yang, Sheng Wang, Xiaobin Hong, Xizi Sun, Marcelo A. Soto, Jian Wu, Luc Thevenaz
Summary: The noise models establish the actual signal-to-noise ratio enhancement provided by pulse coding in BOTDA, showing that polarization noise and SpBS impact the performance of coded-BOTDA. The models serve as a useful tool to optimize SNR improvement by balancing Brillouin gain and optical noises.
Letter
Multidisciplinary Sciences
Marcelo A. Soto, Zhisheng Yang, Jaime A. Ramirez, Simon Zaslawski, Luc Thevenaz
NATURE COMMUNICATIONS
(2021)
Article
Optics
Malak Galal, Suneetha Sebastian, Zhisheng Yang, Li Zhang, Simon Zaslawski, Luc Thevenaz
Summary: This study presents and validates a method to accurately evaluate the non-uniform SNR caused by stochastic variation of back-scattered light intensity, as well as an analytical expression to evaluate the uncertainty in FS estimation using cross-correlation. Experimental verification using a direct-detection f-OTDR shows that system parameters like SNR and spatial resolution can impact the performance of distributed sensing systems utilizing cross-correlation for FS determination.
Article
Optics
Krzysztof Markiewicz, Lukasz Szostkiewicz, Jakub Kaczorowski, Zhisheng Yang, Alejandro Dominguez-Lopez, Marek Napierala, Tomasz Nasilowski, Luc Thevenaz
Summary: This study demonstrates the possibility of performing distributed measurements of the effective refractive index difference between distinct modes in few mode optical fibers using phase sensitive optical time domain reflectometry. The effective refractive index differences between LP02, LP21a, and LP21b modes were measured with a spatial resolution of 24m.
Article
Multidisciplinary Sciences
Fan Yang, Flavien Gyger, Adrien Godet, Jacques Chretien, Li Zhang, Meng Pang, Jean-Charles Beugnot, Luc Thevenaz
Summary: The authors observed efficient Brillouin scattering generated by an evanescent field nearby a single pass sub-wavelength waveguide, which creates a significant connection between Brillouin scattering in waveguides, Brillouin spectroscopy and microscopy. The experiment achieved a higher Brillouin gain compared to previous works, highlighting the importance for further advancements in photonics functionalities.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Li Zhang, Ana Gabriela Correa-Mena, Zhisheng Yang, Florian Sauser, Sebastien Le Floch, Luc Thevenaz
Summary: This closed-loop servo control system provides real-time measurement without postprocessing in Brillouin optical time-domain analysis (BOTDA). It offers fast measurement speed, a large measurement range, high spatial resolution, and is suitable for field applications in harsh environments.
Article
Optics
Tiago F. P. Neves, Lorenzo Scherino, Remy Bernard, Monika Bouet, Aymeric Pastre, Regina Magalhaes, Sonia Martin-Lopez, Hugo F. Martins, Paolo Petagna, Luc Thevenaz
Summary: This paper presents two innovative optical fibers that are insensitive to humidity and exhibit good performance over a temperature range of -20°C to 55°C. The fibers achieve high resolution and fast response time and have been tested under controlled conditions.
Article
Computer Science, Information Systems
Malak Galal, Suneetha Sebastian, Luc Thevenaz
Summary: This paper introduces a method to improve the signal-to-noise ratio of distributed optical fiber sensor systems by increasing the backreflected signal of the fibers, known as reflection-enhanced fibers. It also emphasizes the potential issue of signal-dependent noises accompanied by the enhanced signal. Experimental results show that reflection-enhanced fibers outperform standard single-mode fibers in distributed temperature measurements.
Proceedings Paper
Engineering, Electrical & Electronic
Luc Thevenaz, Fan Yang, Flavien Gyger
Summary: Optical amplification has been achieved in hollow core fibers using stimulated Brillouin scattering in the gaseous medium, with over 50 dB optical gain observed over 50 m of fiber using 200 mW of pump power.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
