Article
Engineering, Electrical & Electronic
Aboulwafa M. Singer, Mohamed Farhat O. Hameed, Ahmed M. Heikal, H. A. El-Mikati, S. S. A. Obayya
Summary: The novel PC-PCF proposed in this study shows high birefringence and low losses, making it a promising candidate for terahertz waveguiding applications.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
C. Priyadharshini, S. Selvendran, A. Sivanantha Raja, Srikanth Itapu, Rudrakant Sollapur
Summary: This study presents a new highly birefringent nonlinear photonic crystal fiber with a simple and compact structure. The fiber features only six air holes in the cladding to confine light at the core, resulting in a more compact design. The fiber exhibits an observed birefringence of about 0.0113, a nonlinear coefficient of about 86.64 W-1 km(-1), and a confinement loss of about 10(-18) dB/km. The measured V-parameter of about 1.108 ensures single-mode operation of the proposed fiber. The compact design and promising properties of the proposed fiber structure make it suitable for a variety of fiber optic-based applications.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Physics, Multidisciplinary
Zihan Liu, Jialin Wen, Zhengyong Zhou, Yuming Dong, Tianyu Yang
Summary: In this study, a highly birefringent photonic crystal fiber (PCF) with a simple center trielliptic is presented. By adjusting the ellipticity and other parameters, the fiber performances can be optimized. This PCF exhibits high birefringence, low confinement loss, and has applications in long distance optical fiber communication, fiber sensing, dispersion compensation, and supercontinuum generation.
Article
Optics
Zihan Liu, Jialin Wen, Zhengyong Zhou, Yuming Dong, Tianyu Yang
Summary: An exceptionally high-performance, high-birefringent photonic crystal fiber with a unique core design was developed. The PCF exhibits a birefringence of 3.57 x 10(-2) at a wavelength of 1.55 μm, a confinement loss of 8.4 x 10 (6) dB/m, a nonlinear coefficient of 41 W (1).km (1), and relatively flat dispersion within the range of 1.3 μm to 1.9 μm. These characteristics make it suitable for polarization preservation, dispersion compensation, wideband supercontinuum generation, and other applications.
Article
Optics
Wa Jin, Xiang Zhang, Xiao Qing Liu
Summary: This paper proposes a highly birefringent one-air-hole panda fiber, which is created by corroding a single stress zone of the traditional panda-type polarization-maintaining fiber. An additional geometric asymmetry is introduced to enhance the birefringence effect and improve the performance of the sensor and special fiber devices. The theoretical and experimental analysis shows that the birefringence of the one-air-hole panda fiber can reach an order of magnitude higher than that of the traditional panda-type fiber. The corroded region provides a microchannel to be filled with a functional material for optical fiber sensors; a salt solution sample was used to measure refractive index with a sensitivity of 3760 nm/RIU.
Article
Engineering, Electrical & Electronic
Biao Wang, Chunrong Jia, Jiantan Yang, Zhigang Di, Jianquan Yao, Jingxuan Zhang
Summary: The new PCF proposed for the terahertz region demonstrates flat dispersion and ultra-high birefringence, making it suitable for short-distance terahertz propagation and sensing applications.
IEEE PHOTONICS JOURNAL
(2021)
Article
Chemistry, Analytical
Tianyu Yang, Liang Zhang, Yunjie Shi, Shidi Liu, Yuming Dong
Summary: The photonic crystal fiber (PCF) designed for chemical analyte detection in the terahertz regime shows high relative sensitivity and can achieve high birefringence, low dispersion, and large effective modal area. It can be applied to liquid chemical sensing and THz systems requiring wide-band polarization-maintaining transmission and low attenuation.
Article
Optics
Shakhawath Hossain, Salimullah Shah, Mohammad Faisal
Summary: A novel Ge20Sb15Se65 based photonic crystal fiber with ultra-high birefringence and large nonlinearity has been proposed, suitable for mid infrared supercontinuum generation, fiber sensor, and spectroscopy systems. By optimizing the cladding arrangement, high birefringence and large nonlinearity can be achieved, with zero dispersion points at specific wavelengths.
Article
Engineering, Electrical & Electronic
Hongyu Tan, Chaotan Sima, Botao Deng, Xiaohang Zhang, Guoqun Chen, Qianqing Yu, Jianghe Xu, Zhenggang Lian, Deming Liu
Summary: The study introduces and demonstrates an ultra-wideband highly-birefringent Bragg layered photonic bandgap fiber with concave-index cladding, which combines concave-convex refractive index distribution with Bragg multilayers to achieve superior optical characteristics such as confinement loss, bending loss, and birefringence. The fiber shows excellent performance in terms of wavelength range, birefringence, and bending loss, making it a promising candidate for applications in freestanding fiber coil and small footprint fiber optical gyroscope.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Damian Michalik, Alicja Anuszkiewicz, Ryszard Buczynski, Rafal Kasztelanic
Summary: We investigated the development of a silica all-glass optical fiber with highly birefringent large mode area, achieved birefringence and single mode operation independent of bending through internal nanostructuring of the core, optimized fiber properties by appropriate selection of germanium and fluorine doping level, and successfully demonstrated its application as a core material in large core area fibers in C-band for polarization components of the fundamental mode.
Article
Chemistry, Multidisciplinary
Jia-Hang Wu, Chun-Li Hu, Ting-Kun Jiang, Jiang-Gao Mao, Fang Kong
Summary: An ordered transition metal fluoroantimonite, K2SbMoO2F7, with high birefringence has been synthesized using the cationic size effect of alkali metals. The compound exhibits excellent transparency in the mid infrared range, making it a promising material for birefringent applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Optics
Yuqi Zhao, Jingshu Guo, Guojiang Yang, Laiwen Yu, Shengyao Qian, Hengtai Xiang, Tianyu Cao, Chenxu Zhou, Daoxin Dai
Summary: This work develops high-performance dichroic filters with 1.49/1.55-μm channels using an inverse design. The introduction of subwavelength gratings (SWGs) leads to loss reduction and footprint compression. The developed filters exhibit improved performance and compactness compared to previous counterparts. Additionally, a triplexer based on these filters shows decent overall performance and compact size.
Article
Engineering, Electrical & Electronic
Mahmoud Salman S. Ibrahim, M. Kotb G. Hamed, Mohammed M. El-Okr, S. S. A. Obayya, Mohamed Farhat O. Hameed
Summary: A highly sensitive 2D Si photonic crystal sensor is proposed for gamma-ray dose detection in the visible light region, achieving high sensitivity, linearity, and quality factor. The sensor design includes a cavity filled with a polymer doped with dyes and the analysis is conducted using finite-element and plane wave expansion methods. This is the first application of 2D-PhC technology for gamma-ray detection.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Analytical
Reyhaneh Jannesari, Thomas Grille, Cristina Consani, Gerald Stocker, Andreas Tortschanoff, Bernhard Jakoby
Summary: The study focuses on the design and optimization of a curved shape photonic crystal taper integrated with a photonic crystal waveguide for CO2 sensing based on absorption spectroscopy. Different approaches to design the taper were investigated, resulting in an improved coupling efficiency of up to 96% at a short taper length. The study also suggests further improvements in controlling the group index along the taper to enhance coupling efficiency in a wider spectral range.
Article
Optics
Sergei Mikhailov, Anne Matthes, Jorg Bierlich, Jens Kobelke, Katrin Wondraczek, Francis Berghmans, Thomas Geernaert
Summary: We demonstrate distributed optical fiber-based pressure measurements with subbar pressure resolution and 1 m spatial resolution over a similar to 100 m distance using a phase-sensitive optical time-domain reflectometry technique. The high birefringence microstructured optical fiber designed in this study exhibits high polarimetric pressure sensitivities and low polarimetric temperature sensitivities at a wavelength of 1550 nm. The uniform birefringence and low propagation loss of the fiber enable pressure measurements along distances up to several kilometers.
Article
Engineering, Electrical & Electronic
Agnieszka Gierej, Kurt Rochlitz, Adam Filipkowski, Ryszard Buczynski, Sandra Van Vlierberghe, Peter Dubruel, Hugo Thienpont, Thomas Geernaert, Francis Berghmans
Summary: We have prepared and characterized microstructured biodegradable and biocompatible polymer optical fibers using commercially available poly(D,L-lactic acid) (PDLLA). The preparation of preforms by transfer molding and fiber manufacturing was reported and the influence of polymer processing on the molar mass decrease of PDLLA was investigated. The in vitro degradation of the fabricated fibers in phosphate buffered saline (PBS) was studied, showing molar mass loss of 21%, 25%, and 43% over 105 days for fibers with diameters of 400, 200, and 100 μm, respectively. Cutback measurements revealed an attenuation coefficient of 0.065 dB/cm at 898 nm for a microstructured fiber with a diameter of 219 +/- 27 μm. After immersion in PBS at 37 degrees C, the optical loss increased by 0.4 dB/cm at 950 nm after 6 h and by 0.8 dB/cm after 17 h.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Wendy Meulebroeck, Mathilde Patin, Karin Nys, Hugo Thienpont
Summary: There is a need to understand the link between the optical spectrum and technology parameters of silver-staining. The study conducted experiments on samples with known fabrication conditions, comparing optical and chemical methods to identify the measures that match material properties. The research resulted in a flowchart scheme for non-destructive assessment of silver-staining technology and its potential application in different glass families.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Optics
Tushar Malica, Krassimir Panajotov, Eugene A. Avrutin, Marc Sciamanna
Summary: This study proposes a dual-laser configuration using two VCSELs placed facing each other as a promising alternative to conventional SESAM mode-locked VECSEL to generate mode-locked pulses. A theoretical model based on time-delay differential rate equations is used to demonstrate that this configuration functions as a typical gain-absorber system. The nonlinear dynamics and pulsed solutions are investigated by exploring the parameter space defined by laser facet reflectivities and current.
Article
Engineering, Biomedical
Alejandro Madrid-Sanchez, Fabian Duerr, Yunfeng Nie, Hugo Thienpont, Heidi Ottevaere
Summary: The characteristics of high porosity, microscale features, and pores interconnectivity make scaffolds suitable for human tissue substitutes. However, these characteristics often limit the scalability of different fabrication approaches, especially in bioprinting techniques. In this study, an alternative vat photopolymerization technique called light sheet stereolithography (LS-SLA) is proposed to fabricate centimeter-scale scaffolds with high resolution. The LS-SLA technology allows the modification of voxel profiles using laser beam shaping and enables the production of complex three-dimensional scaffolds.
INTERNATIONAL JOURNAL OF BIOPRINTING
(2023)
Article
Engineering, Electrical & Electronic
Ikuo Arata, Hirotoshi Terada, Michael Vervaeke, Dries Rosseel, Hugo Thienpont
Summary: In this study, a gallium arsenide (GaAs) aspherical solid immersion lens (SIL) has been developed for semiconductor failure analysis. The SIL significantly increases the numerical aperture and spatial resolution of a microscopy system by attaching it to the backside of the device-under-test. To improve the spatial resolution, a shorter wavelength light source is used. The use of GaAs as SIL material enables the use of shorter wavelengths, and an aspherical design corrects spherical aberration, resulting in diffraction limited performance for semiconductor failure analysis.
MICROELECTRONICS RELIABILITY
(2023)
Article
Chemistry, Analytical
Lien Smeesters, Jef Verbaenen, Luca Schifano, Michael Vervaeke, Hugo Thienpont, Giancarlo Teti, Alessio Forconi, Filippo Lulli
Summary: This study proposes a novel five-channel multispectral camera design suitable for autonomous and continuous crop monitoring. It covers visible, near-infrared, and thermal wavelength bands, allowing the sensing of various vegetation indices. The wide-field-of-view imaging design exceeds 164 degrees, providing a larger field of view compared to drone-sensing systems.
Article
Chemistry, Analytical
Olga Rusyakina, Thomas Geernaert, Mederic Loyez, Maxime Lobry, Karima Chah, Pawel Mergo, Hugo Thienpont, Christophe Caucheteur, Francis Berghmans, Tigran Baghdasaryan
Summary: We address the challenge of spectral multiplexing of biosensors in a single optical fiber by combining photonic crystal fibers (PCF) with fiber Bragg grating technology. We utilize the optical transmission spectrum of a straight fiber Bragg grating in a PCF to excite cladding mode resonances, enabling plasmonic label-free biodetection of HER2 protein. Our PCF sensor can detect a protein concentration of 8.62 nM with high reproducibility.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Food Science & Technology
Lien Smeesters, Thomas Kuntzel, Hugo Thienpont, Ludovic Guilbert
Summary: Aflatoxins pose a significant threat to food and feed safety, but current methods of detection are not well-suited for identifying their presence in the food chain. In this study, we developed a non-destructive optical sensing technique based on fluorescence spectroscopy, resulting in a novel compact fluorescence sensing unit. Testing showed that the unit had high sensitivity and successfully classified naturally contaminated maize kernels. This sensing methodology has the potential to greatly enhance food safety.
Article
Optics
Krassimir Panajotov, Minko Petrov, Yordan Marinov
Summary: We propose a new construction of spin-VCSEL with an embedded nematic liquid crystal (LC) in a second cavity. We design a coupled-cavity LC-VCSEL and develop a procedure for calculating its LC-voltage dependent polarization resolved resonant longitudinal modes and their quantum-well confinement factors. Using these characteristics, we slightly modify the spin-flip VCSEL model to include the voltage dependent birefringence and anisotropy. Then, we show that such an LC-VCSEL can achieve small signal modulation response with a 3dB cut off frequency of several hundreds of GHz.
Article
Mathematics, Interdisciplinary Applications
M. Tlidi, M. Bataille-Gonzalez, M. G. Clerc, L. Bahloul, S. Coulibaly, B. Kostet, C. Castillo-Pinto, K. Panajotov
Summary: In this paper, we theoretically investigate the combined impact of the Kerr and stimulated Raman scattering effect on localized structures and frequency comb generation. We focus on the traveling wave instability regime and derive a Swift-Hohenberg equation with nonlocal delayed feedback to describe the system. By estimating thresholds and speeds, we characterize the motion of traveling wave periodic solutions. Numerical simulations confirm the existence of isolas of localized structures, and we demonstrate that stimulated Raman scattering strongly affects the dynamics of these structures and induces their motion. We also provide a geometric interpretation of the formation of isola stacks based on dynamical systems theory.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Chemistry, Analytical
Sara Abbasi, Mehdi Feizpour, Ilse Weets, Qing Liu, Hugo Thienpont, Francesco Ferranti, Heidi Ottevaere
Summary: Identifying hemoglobinopathies is crucial for managing clinical diseases. This study demonstrates the potential of Raman spectroscopy in combination with high-performance liquid chromatography for accurate identification of different hemoglobin types.
MICROCHEMICAL JOURNAL
(2023)
Proceedings Paper
Education, Scientific Disciplines
Astghik Chalyan, Tine De Pauw, Nathalie Debaes, Hugo Thienpont
Summary: More than 10 years ago, the Photonics Explorer Kit (PEK) was developed as an educational tool to inspire students towards photonics. It has been widely used by physics teachers and optics-related organizations, reaching over 200,000 students annually. The PEK aims to promote the understanding and impact of light technologies in schools, universities, and companies worldwide.
SEVENTEENTH CONFERENCE ON EDUCATION AND TRAINING IN OPTICS AND PHOTONICS: ETOP 2023
(2023)
Article
Optics
Artem Shcheglov, Yunfeng Nie, Hugo Thienpont, Heidi Ottevaere
Summary: Recently, there is a growing trend for cost-effective, portable spectrometers to be applied in various fields, including scientific research, food safety, and air pollution analysis. In this study, we propose a miniaturized, two-channel, broadband spectrometer based on variable-spacing concave gratings, which integrates imaging optics and diffraction gratings into a single component. The design allows for a small volume and high spectral resolution, and simulation results demonstrate optical resolutions of less than 1.6 nm in the visible channel and less than 3.1 nm in the near-infrared channel. To validate the feasibility for mass production, we successfully manufactured the variable-spacing concave gratings using diamond tooling and hot embossing replication. The fabricated grating replicas exhibit high diffraction efficiency in both channels. Experimental results of the prototype show a good match in spectral resolution with the nominal design.
JOURNAL OF OPTICAL MICROSYSTEMS
(2023)
Proceedings Paper
Optics
F. Duerr, H. Thienpont
Summary: Today's optical design of imaging systems heavily relies on efficient ray tracing and optimization algorithms. However, the traditional design approach often requires extensive experience, intuition, and trial-and-error guesswork. We propose a novel method that allows systematic generation and evaluation of directly calculated imaging optics design solutions, enabling a rigorous and real-time evaluation in solution space. The method is based on differential equations derived from Fermat's principle and can calculate optical surface coefficients to minimize image blurring for each individual aberration order.
OPTICAL DESIGN AND TESTING XII
(2023)
Proceedings Paper
Optics
S. Sorgato, L. Smeesters, M. Vervaeke, K. Rochlitz, D. Rosseel, J. Verbaenen, H. Thienpont, T. Geernaert, J. Van Erps
Summary: This article presents a miniature freeform lightguide for sensing applications, designed using the principles of the flow-line method from Nonimaging Optics. The optic is created by combining two 2D flow-line concentrators in a curved monolithic piece, achieving a large half-acceptance angle and beam steering. The compact size and high optical quality of the design are achieved through thorough tolerance analysis and fabrication using plastic injection molding.
NONIMAGING OPTICS: EFFICIENT DESIGN FOR ILLUMINATION AND SOLAR CONCENTRATION XVIII
(2022)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)
