bluuebunny/crossref_metadata_2025 huggingface dataset:
New approaches to polarization optics and structured light with metasurfaces
Authors: Capasso Federico
Published: November 2021

Metasurfaces are a powerful tool to design arbitrary vector beams. I will discuss recent work on spin to total orbital angular momentum converters, high purity OAM lasing and transverse/longitudinal structured light generation
An Ultracompact and Efficient Long-Wavelength Plasmonic Cut-Off Filter based on Asymmetric E-Shaped Resonator
Authors: Ebadi Seyed Morteza , Örtegren Jonas
Published: November 2021

This paper presents design and simulation results of a super-compact and efficient plasmonic cut-off filter based on an asymmetric E-shaped resonator. Moreover, by modulating length of the resonator, cut-off wavelength can be easily adjusted.
Single-Shot Volumetric Imaging Using Optical Projection Tomography
Authors: Darling Connor , Davis Samuel P. X. , Kumar Sunil , French Paul M. W. , McGinty James
Published: November 2021

We present a single-shot volumetric imaging method, utilising optical projection tomography. We record up to 70 1x1x1.9mm full-field volumes/second by recording projections simultaneously and implementing compressive sensing and machine learning.
Deep learning in frequency space enables sample-independent parameter estimation in Fourier ptychographic microscopy
Authors: Jadhav Suyog , Ströhl Florian
Published: November 2021

Parameter estimation is crucial for phase retrieval in Fourier ptychographic microscopy. We cast this task as object detection problem in frequency space, thus permitting the use of a neural network that performs with unprecedented accuracy.
Digital Staining of Reflectance Confocal Microscopy Images: A Proof of Concept
Authors: Rubin Alexandra , Wallden Olivia , Haroon Attiya , Liu Yuwei , Liu Xuan , Rao Babar K
Published: November 2021

This preliminary study shows that convolutional neural networks can be trained to recognize and digitally stain cellular patterns within confocal images of the skin.
Texture analysis of deep ultraviolet fluorescence images for intraoperative assessment of breast tumor margins
Authors: Lu Tongtong , Jorns Julie , Patton Mollie , Fisher Renee , Emmrich Amanda , Gilat-Schmidt Taly , Ye Dong Hye , Yen Tina , Yu Bing
Published: November 2021

Deep ultraviolet (DUV) excitation has generated high-resolution fluorescence images of fresh and unfixed breast tissues. We report that texture analysis of DUV images can potentially differentiate malignant samples from normal breast tissues.
Light polarization interaction with skin conditions assessed by polarization sensitive optical coherence tomography
Authors: Zhou Xin , Louie Daniel C. , Maloufia Sina , Tchvialeva Lioudmila , Lee Tim K. , Tang Shuo
Published: November 2021

Polarization sensitive optical coherence tomography (PS-OCT) is utilized to assess skin characterizations, including layered tissue structures, light depolarization, and tissue birefringence. The multiple contrasts from PS-OCT provide a more comprehensive characterization of different skin conditions.
Widefield Polarimetric Second Harmonic Generation Techniques for Histopathology
Authors: Castaño Leonardo José Uribe , Mirsanaye Kamdin , Golaraei Ahmad , Akens Margarete K. , Kontenis Lukas , Barzda Virginijus
Published: November 2021

Measurements of different polarimetric parameters are performed using polarimetric widefield second harmonic microscopy in collagenous tissue. An analysis on the bleaching process in an H&E-stained sample is performed as well.
Quantifying 3D tissue kinematics though second harmonic generation microscopy of skin during mechanical loading
Authors: Woessner Alan E. , Jones Jake D. , Witt Nathan J. , Sander Edward A. , Quinn Kyle P.
Published: November 2021

Second harmonic generation microscopy was used to understand the micro-scale kinematic response of mouse skin under tensile loading. A substantial decrease in local tissue volume and non-affine 3D fiber kinematics were observed.
Accelerating Two Photon Microscopy Imaging Speeds Using Silicon Photomultipliers
Authors: Ching Roa Vincent D. , Olson Eben M , Torres Richard , Giacomelli Michael G.
Published: November 2021

We demonstrate a new approach to two photon detection electronics that dramatically increases bandwidth and dynamic range, enabling higher imaging speeds and SNR than conventional PMTs. We have made this technology available through the OpenSiPM project.
Tailoring the light distribution of micro-LED displays with a compact compound parabolic concentrator and an engineered diffusor
Authors: Hsiang En-Lin , He Ziqian , Yang Zhiyong , Lan Yi-Fen , Wu Shin-Tson
Published: November 2021

We propose a novel optical design to tailor the angular distribution of a micro-LED (µLED) display system and use vehicle display as an example to illustrate the design principles. The display system consists of a µLED array with a tailored LED structure, a small formfactor compound parabolic concentrator (CPC) system, and a functional engineered diffusor. It provides high efficiency, high peak brightness, and small formfactor. In the design process, a mix-level optical simulation model, including the angular distribution of polarized emission dipole (dipole emission characteristics), Fabry-Perot cavity effect (wave optics), and light propagation process (ray optics), is established to analyze the angular distribution of µLEDs. Such an optical design process from dipole emission to display radiation pattern can be extended to other µLED display systems for different applications.
Impact of Chromatic Dispersion in Discrete Raman Amplifiers on Coherent Transmission Systems
Authors: Hazarika Pratim , Abu-Romoh Mahmood , Tan Mingming , Krzczanowicz Lukasz , Nguyen Tu T. , Iqbal Md Asif , Phillips Ian , Harper Paul , Li Ming-Jun , Forysiak Wladek
Published: November 2021

The impact of chromatic dispersion in discrete Raman amplifiers on coherent transmission systems was investigated. Systems with positive dispersion gain fibre show a SNR improvement of ~1.8 dB for 23-GBaud DP-QPSK signals transmitted over >1800km.
Forecasting Lightpath QoT with Deep Neural Networks
Authors: Chouman Hussein , Djukic Petar , Tremblay Christine , Desrosiers Christian
Published: November 2021

We propose multilayer perceptron (MLP) and long short-term memory (LSTM) deep neural network models trained with field data for forecasting the minimum quality of transmission of deployed lightpaths over horizons up to 72 hours.
Atomic Spin Precession Detection with Fiber Optic Saganc Interferometer
Authors: Chen Dongying , Yang Yuanhong , Jin Wei
Published: November 2021

We propose and experimentally demonstrate an atomic spin precession detection technique using a modified reflective closed-loop fiber-optic Saganc interferometer with circularly polarized light. Preliminary tests for the measurements of magnetic field and rotation rate based on the polarized K-Rb-21Ne comagnetometer achieve a magnetic field sensitivity of 1.2 pT/Hz1/2 and a rotation sensitivity about 1.65×10−5 rad/s/Hz1/2, respectively. The nonlinear response of the atomic gyroscope is also investigated.
FOREWORD to the Optical Fiber Sensors Conference 2020 Special Edition
Authors: Cranch Geoffrey A , Wang Anbo
Published: November 2021

The 27th International Conference on Optical Fiber Sensors was to be held on June 8th 2020 in Alexandria, Virginia USA. By March of 2019, over 330 papers had been scheduled for presentation with eight invited speakers, two workshops and eight.
Optical Fiber Sensors for Energy Infrastructure: Emerging Opportunities
Authors: Ohodnicki Paul R. , Chen Kevin P.
Published: November 2021

This paper discusses application of fiber optics sensors to increase operational visibility of energy systems. Ubiquitous real-time monitoring by high spatial resolution sensing provides new information for advanced data analytics enhancing reliability, resiliency, and efficiency.
Quasi-distributed fiber sensing via perfect periodic Legendre codes
Authors: Arbel N , Shiloh L , Levanon N , Eyal A
Published: November 2021

Long-range Rayleigh-based Distributed Acoustic Sensing (DAS) systems are often limited in their sensitivity and bandwidth. The former limitation is a result of the low backscat- tered power and poor dynamic-strain to optical-phase transduction efficiency. The latter constraint results from the trade-off between range and scan-rate which limits the sampling interval to the longest delay in the sensing fiber. Quasi-DAS (Q-DAS) can yield enhanced sensitivity but may still suffer from low backscattered power and low scan-rate for long- haul, many-sensor, systems. In this work we study the use of Perfect Periodic Correlation codes for interrogating a long-haul Q-DAS system. It is shown that judicious choice of the code parameters allows order of magnitude increase in detection bandwidths and in the power reflected from each sensor.
Fast and direct measurement of longitudinal birefringence distribution in conventional single-mode optical fibers
Authors: Costa Luis , Magalhães Regina , Palmieri Luca , Martins Hugo , Martin-Lopez Sonia , Fernández-Ruiz María R. , Gonzalez-Herraez Miguel
Published: November 2021

Single-mode optical fibers exhibit very low phase birefringence, being hard to measure by current techniques. Here, we propose a distributed method to directly measure the fiber birefringence over several kilometers, in only a few seconds.
Distributed Acoustic Sensing with 100 km Distance Range Using a Polarization-Diverse Coherent OTDR Interrogator
Authors: Jostmeier Thorben , Marx Benjamin , Rath Alexander , Hill Wieland
Published: November 2021

We demonstrate DAS using phase-sensitive OTDR with polarization-diverse coherent detection. It provides 100 km range using standard fiber, 124 km using specialty fiber, sub-nε strain sensitivity and four orders of magnitude dynamic range at shorter distance.
High temperature hydrogen resistant scattering enhancement in 900m of standard single mode fiber
Authors: Westbrook Paul , Feder Kenneth , Stolov Andrei , Shenk D. Scott
Published: November 2021

We fabricate an optical fiber with enhanced back scattering that increases by 13 dB over 900m. When this fiber is placed in a 75psi hydrogen environment at 150C for three days, the enhanced scattering signal persists along the entire fiber while a loss of 5dB/km is observed outside the enhancement bandwidth.
Brillouin Optical Correlation Domain Analysis Assisted by First-Order Distributed Raman Amplification
Authors: Ryu Gukbeen , Kim Gyu-Tae , Song Kwang Yong , Lee Sang Bae , Lee Kwanil
Published: November 2021

We introduce the Raman amplification to increase the sensing range in the Brillouin optical correlation domain analysis (BOCDA). Compared to our previous report, the optimized Raman pumping scheme is numerically simulated and enhanced sensing length is experimentally demonstrated. The differential measurement method and time-domain data processing are further introduced in the backward distributed Raman pumped BOCDA system for the performance improvement. Strain changes of 1 mε over 7 cm have been measured at 52 km sensing fiber.
Distributed nano-Strain Sensing Based on Random Fiber Grating Array
Authors: Wang Yuan , Lu Ping , Mihailov Stephen , Bao Xiaoyi
Published: November 2021

A high precision distributed real time measurement for dynamic strain sensing in a chirped pulse phase optical time domain reflectometry (φ-OTDR) system based on random fiber grating array is experimentally demonstrated. The minimum detectable amplitude of dynamic strain is 52 nε with frequency of 1 Hz.
Shape Sensing for Large-scale Line Structures with Multi-core Fibers by Using Brillouin OTDR
Authors: Maeda Yoshiki , Kobayashi Makito , Toh Kimihiro , Hanzawa Nobutomo , Koizumi Kengo , Murai Hitoshi , Wada Ryota , Matsui Takashi , Nakajima Kazuhide , Murayama Hideaki
Published: November 2021

We estimated the shape of the multi-core fiber with the curvatures of 1.00 m-1 and 0.53 m-1 by BOTDR. The applicability of the MCF and BOTDR to the shape sensing for smaller curvature was shown.
Optical fiber strain and temperature coefficients determination based on Rayleigh-OFDR
Authors: Boiron H. , Pillon J. , Peter E. , Robin T. , T.Villedieu  , Morana A. , Girard S. , Boukenter A. , Marin E. , Lefèvre H.
Published: November 2021

Strain and temperature sensing with optical fiber rely on strain and temperature coefficient characterization. We deduce these coefficients from Rayleigh-OFDR measurements as well as their dependencies on temperature and fiber parameters.
Simultaneous Multi-point Sensing based on Brillouin Optical Correlation Domain Analysis with Digital Lock-in Detection Scheme
Authors: Agarwal Abhinav , Somepalli Bhargav , Venkitesh Deepa , Srinivasan Balaji
Published: November 2021

We propose a novel approach for demodulating Brillouin Optical Correlation Domain Analysis (BOCDA) signals using digital dual-phase lock-in detection scheme, which enables simultaneous multi-point sensing.
Bipolar Cyclic Linear Coding for Brillouin Optical Time Domain Analysis
Authors: Fang Jian , Li Yaowen , Huang Yue-Kai , Wang Ting
Published: November 2021

We demonstrate, for the first time, that cyclic linear pulse coding can be bipolar for BOTDA sensors, breaking the unipolar limitation of linear coding techniques and elevating the coding gain for a given code length.
Enhancement of Strain Dynamic Range in BOCDA Distributed Strain Measurement Technology Simplified by Synthesizing Frequency Modulation Waveform
Authors: Ito Naoki , Yamashita Rodrigo Kendy , Kishi Masato , Hotate Kazuo
Published: November 2021

We proposed a method that simplified Brillouin Optical Correlation Domain Analysis system by synthesizing frequency modulation waveform, and demonstrated it experimentally. By utilizing numerical simulation, we improve synthesized FM waveform to enhance strain dynamic range.
Thermal response characterization of different optical fibers samples at cryogenic temperatures
Authors: Marcon Leonardo , Chiuchiolo Antonella , Castaldo Bernardo , Bajas Hugues , Galtarossa Andrea , Bajko Marta , Palmieri Luca
Published: November 2021

The thermal responses at cryogenic temperatures (5-300 K) of optical fibers with four different coatings are experimentally measured by means of optical frequency domain reflectometry. An estimate of the sensitivities of the different fibers is reported.
Large dynamic strain sensing for φ−OTDR with frequency modulation pulse and frequency interrogation
Authors: Zhang Jingdong , Wu Haoting , Huang Jingsheng , Zhng Hua , Yin Guolu , Zhu Tao
Published: November 2021

We propose a large dynamic strain sensing for φ−OTDR based on frequency modulation pulse and frequency interrogation. The detectable range can go beyond 130 με at 20 kHz over 10 km sensing range.
Coherent Phase-sensitive Optical Time Domain Reflectometer Based on Digital Orthogonal Pulses
Authors: Jiang Junfeng , Chen Wenjie , Liu Kun , Wang Shuang , Ma Zhe , Ding Zhenyang , Xu Tianhua , Liu Tiegen
Published: November 2021

A coherent phase-sensitive optical time domain reflectometer (COTDR) based on digital orthogonal pulses is proposed. The digital orthogonal pulses provide phase diversity demodulation with a single detector and system sampling frequency will not reduce.
Cladding mode analysis and experimental acousto-optic mode conversion for dynamic inter-core routing in a four-core fiber
Authors: Youn Jae Hyeong , Song Kwang Yong , Park Hee Su
Published: November 2021

High-efficiency and wavelength-selective excitation of higher-order cladding modes in a four-core fiber is implemented using an acousto-optic mode converter. Dynamic inter-core routing through core-to-cladding-to-core three-mode coherent coupling is demonstrated with good agreement with theory.
A Long Range Distributed Acoustic Sensor Based on Remotely Pumped Optical Amplifier
Authors: van Putten L.D. , Masoudi A. , Brambilla G.
Published: November 2021

A single-ended distributed acoustic sensor based on remotely pumped Er-doped fibre amplifier is demonstrated using a 1480nm Raman fibre laser as pump at the front-end of the fibre to achieve a 100km sensing range and 2.6m spatial resolution.
Improved X-ray detection efficiency of YAG derived fiber with cerium and terbium co-doping
Authors: Jia Ming , Wen Jianxiang , Pan Xiangping , Pang Fufei , Chen Zhenyi , Wang Tingyun
Published: November 2021

A cerium and terbium co-doped YAG derived fiber is fabricated using the CO2 laser heated method. The scintillation efficiency of the obtained fiber is appropriately 3.0 times larger than that of terbium-doped YAG derived fiber.
PIC based FBG Interrogator Designed for High Accuracy and Low Noise Seismic and Dynamic Measurements
Authors: Ibrahim Selwan K. , McCue Raymond , O’Dowd John A. , Bessler Vivian , Farnan Martin , Karabacak Devrez M. , Singer Johannes M.
Published: November 2021

We propose and demonstrate using photonic integrated circuit (PIC) technology, a tunable-laser based FBG interrogator suitable for low noise seismic applications sampling at kHz rates and delivering <120dB re(nm2/Hz) noise floor over a 500Hz bandwidth.
Searching Kerr solitons in microresonators by using deep neural networks
Authors: Peng Cheng , Tan Teng , Yuan Zhongye , Xie Xu , Liu Hao , Xie Zhenda , Rao Yunjiang , Yao Baicheng
Published: November 2021

Soliton Kerr combs show wide potential for optical sensing such as spectroscopy. Here we demonstrate deep neural networks for predicting the microcomb formation. The error of this method could be < 4%.
Multifunctional Cavity Enhanced Lab-on-Fiber optrodes
Authors: Giaquinto M. , Aliberti A. , Micco A. , Gambino F. , Ruvo M. , Ricciardi A. , Cusano A.
Published: November 2021

A microgel film sandwiched between two gold layers is integrated onto the optical fiber tip to form a multifunctional Lab-on-Fiber optrode able to work as a sensor for small biomolecules detection, and as a nano-opto-mechanical-actuator.
Traffic Monitoring Based on FBG Sensor Arrays in Asphalt Structures
Authors: Bravo M. , Leandro D. , Bravo-Acha A. , Bravo-Navas M. , Mitxelena J. R. , Martinez-Mazo J. J. , Camarero E. , Lopez-Amo M.
Published: November 2021

We evaluate the capabilities of optical fiber sensors to measure traffic flow, speed, weight estimation and pavement degradation. The proper operation of the system has been proved 3.5 years after the installation in a metropolitan road.
Evaluation of Optical Fibre Based Sensor for use in Brachytherapy Treatment.
Authors: Kam Wern , Byrne Lauren , Woulfe Peter , O’Keeffe Sinead
Published: November 2021

This paper presents an evaluation of optical fibre sensors for use in brachytherapy treatment where the sensor tip is embedded with radiosensitive scintillation powder, Terbium doped Gadolinium Oxysulphide (Gd2O2S:Tb). Two sensors, fabricated using the same fiber design parameter and size, have been fabricated and evaluated using a Standard Imaging HDR 1000 Well Chamber for increasing numbers of brachytherapy seeds. A sensor holder was designed and 3-D printed to accommodate both the seeds and the sensor for this evaluation purposes. The results show a linear response with number of seeds and demonstrate an excellent agreement with the seed activity measured using a commercial type well chamber. In future, this can be a potential calibration methods for optical fibre sensors prior to use in brachytherapy.
A non-invasive method for state-of-charge estimation of Li-ion batteries using Fibre Bragg Grating-based sensors
Authors: Rente Bruno , Fabian Matthias , Liu Xuan , Li Xiang , Li Kang , Sun Tong , Grattan Kenneth T V
Published: November 2021

Fibre Bragg Gratings are employed as input of a state-of-charge prediction algorithm for Lithium-ion batteries. Data gathered allowed the development of a dynamic time-warping algorithm for prediction of the state of charge of battery.
Reduced graphene oxide (RGO) based optical fiber humidity sensor
Authors: Mohan Sunil , Srinivasan A. , Khijwania Sunil K.
Published: November 2021

An optical fiber humidity sensor employing reduced graphene oxide (RGO) doped sol-gel microstructured thin film as the sensing fiber cladding and evanescent wave absorption is reported. Main objective of the present work is to achieve a linear sensor response with enhanced sensitivity over the wide dynamic range using simplest possible sensor geometry. Only 0.1g RGO doping in the sensing film resulted in the three fold sensitivity enhancement.
A vertical-fluid-array induced optical fiber long period grating (VIOLIN) sensor
Authors: Hu Deming , Xu Zhiyuan , Long Junqiu , Liang Lili , Sun Lipeng , Ran Yang , Guan Bai-Ou
Published: November 2021

We propose a highly flexible and applicable configuration- “vertical-fluid-array induced optic microfiber long period grating” (VIOLIN) to further explore the characteristics of the liquids. The high RI sensitivity of VIOLIN enables it a conveniently reproducible chemical sensor towards thiol compounds. The proof-of-concept could be described briefly as “Liquid renders the resonance to light. Light deciphers the secret of liquid.”
Compact Interferometric Sensors for Simultaneous Detection of Multiple VOCs
Authors: Mallik Arun Kumar , Wang Zhe , Wang Zhuochen , Semenova Yuliya
Published: November 2021

In this work we experimentally demonstrate a 2-sensor array based on fused silica capillary interferometers (FSCIs) functionalized with Polyaniline Hydrochloride (PAH)/SiO2 films for simultaneous measurement of two volatile alcohols concentrations in an aqueous solution. The sensing mechanism relies on monitoring spectral shifts in the sensors’ transmission spectra due to changes in the effective refractive index (RI) of the functionalized layers caused by the adsorption of the volatile alcohol molecules. The individual concentrations in the mixture are determined with the help of inverse matrix method. This work is a preliminary investigation towards the development of a novel method for assessment of quality of alcoholic beverages in real time using a sensor array.
Non-Degraded Operation of BOCDR Using Thermally Uncontrolled DFB Laser
Authors: Motoishi Naoki , Noda Kohei , Lee Heeyoung , Mizuno Yosuke , Nakamura Kentaro
Published: November 2021

We show that 1-°C drift of laser temperature yields strain error of ~8 με in Brillouin optical correlation-domain reflectometry. We do not require laser thermal control, leading to cost reduction and downsizing of the system.
Distributed acoustic sensing of debris flows in a physical model
Authors: Schenato Luca , Tecca Pia R. , Deganutti Andrea M. , Martins Hugo F. , García-Ruiz Andrés , Fernóndez-Ruiz María del Rosario , Martín-López Sonia , Zarattini Francesco , Pol Antonio , Gabrieli Fabio , Galtarossa Andrea , Pasuto Alessandro , Gonzalez-Herráez Miguel , Palmieri Luca
Published: November 2021

We used a distributed acoustic sensing (DAS) system to monitor the evolution of debris flows in an inclined flume that was instrumented with approx. 800 m of fiber, wound in 20 coils acting as an array of coherent acoustic sensors. The analysis of the acquired signals confirmed the viability of DAS as a tool for debris flows monitoring.
Distributed Strain and Shape Measurements using Optical Frequency Domain Reflectometry
Authors: Tongue Alex , Scurlock Ryan
Published: November 2021

Acronyms OFDR – Optical Frequency Domain Reflectometry FBG – Fiber Bragg Grating FEM – Finite Element Model UAV – Unmanned Aerial Vehicle
All Polymer Optical Fiber Sensor for Dissolved Oxygen in Fish Farms
Authors: Inglev Rune , Møller Emil , Atzen Niclas , Højgaard Jonas , Janting Jakob , Bang Ole
Published: November 2021

We present an all-polymer optical fiber sensor for the measurement of dissolved oxygen. The sensing matrix containing oxygen-sensitive PtOEP, is of the same polymer as the optical fiber core, leading to increased robustness.
Investigation of acoustic emission characteristics of CFRP materials using fiber laser sensors
Authors: Zhang Jianxiang , Huang Wenzhu , Zhang Wentao , Lv Bing , Zhang Haibing , Li Fang
Published: November 2021

Investigations of acoustic emission characteristics of CFRP material using fiber laser sensor with wavelength resolution of 1×10-6 pm/√Hz@100 kHz is presented. The results show that ultra-weak acoustic emission signals can be detected.
In-field Torsion Measurements on Solar Trackers Using Fiber Optic Sensors
Authors: Leandro D. , Bravo M. , Judez A. , Mariñelarena J. , Falcone F. , Loayssa A. , Lopez-Amo M. , Moriana I. , Jimenez S.
Published: November 2021

In-field torsion measurements on solar trackers using fiber Bragg gratings are presented. 45 FBG sensors have been deployed in an operational solar energy plant to study the mechanical response of the structure to wind.
Fibre optic pulse interferometer as a sensor of the human impact on the telecommunications cable
Authors: Życzkowski M. , Karol M. , Brewczyński K.D.
Published: November 2021

A modified optical fibre based Mach-Zehnder interferometer was applied as a sensor to detect wiretapping in long transmission optical fibre lines. When the detection line was not disturbed, the detectors registered a series of pulses without changing their peak power. For robust detection of any alarm situation we proposed algorithm to minimize false alarm rate. Moreover, slow environmental fluctuations were continuously monitored and compensated by polarisation controllers. We measured the response characteristics of the sensor to typical disturbances resulting from human interference in the telecommunications cable, which confirmed the high performance of the sensor.
Strain measurement of hydraulic turbine using distributed optical fiber sensor: a preliminary study
Authors: Yao Can , HUANG Xingxing , Zhu PingYu , Thévenaz Luc
Published: November 2021

This paper demonstrates the feasibility and huge potential of applying distributed fiber optic sensing technologies to strain monitoring and failure predictions in hydraulic machinery, validated by a good match between experimental results and theoretical predictions.
Comparative of Novel Method to Obtain Pulse from Differential Speckle Signal
Authors: Reyes-Gónzalez Luis , Anabitarte-Garćıa Francisco , Rodŕıguez-Cobo Luis , Lomer Mauro , López-Higuera José Miguel
Published: November 2021

This work presents a new analysis methods of the specklegram signal and its comparative with other method for achieving a precise and robust non-contact pulse monitor system.
Transfer learning for temperature predictions in sensors employing fibre Bragg grating arrays
Authors: Djurhuus Martin S.E. , Schmauss Bernhard , Clausen Anders T. , Zibar Darko
Published: November 2021

The feasibility of transfer learning is experimentally demonstrated by accurate predictions of temperatures of FBGs excluded from the training process with SMSE in the 10
−
3 range even for FBG peak powers around -30 dBm.
Accelerated in-situ Measurements of Radiation Induced Effects on Optical Fibers at IRR1 Research Nuclear Reactor
Authors: Zilberman Shlomi , Berkovic Garry , Shafir Ehud , Dadon Mirit , Alefe Mantefardo , Ben Meir Kobi , Krakovich Alexander , Makmal Tzach
Published: November 2021

An apparatus was designed in order to test optical fibers and optical fiber sensors inside the core of the IRR1 research nuclear reactor in real-time, while irradiated up to a total dose of ~3MGy. The apparatus enables coiling 20 meter lengths of 4 types of different fibers into a very small space, to fit into the center of the core, thus amplifying attenuation effects. In parallel the response of Bragg Gratings in the fiber to irradiation was also monitored. This approach can lead to quicker and more efficient optical fiber sensor testing in ionizing radiation environments.
Towards an Online Polymer Optical Fiber Cortisol Sensor for Aquaculture
Authors: Janting Jakob , Inglev Rune
Published: November 2021

Monitoring fish stress is important for optimizing aquaculture production. We present the first steps towards an online all-polymer optical fiber aquaculture cortisol stress hormone sensor.
Monitoring of Cu(II) ions based on whispering gallery modes in liquid crystal microdroplets excited by tapered optical fiber
Authors: Duan Rui , Hao Xiaolei , Li Hanyang , Yuan Yonggui , Yang Jun
Published: November 2021

We demonstrate a liquid crystal microdroplet optical fiber biosensor based on whispering gallery mode for monitoring of Cu(II) ions. The detection limit of proposed biosensor for Cu(II) ions is as low as 1 μg/L.
Polymer microtip as an optical fiber threshold chemical sensor
Authors: Marć P. , Żuchowska M. , Jakubowska I. , Jaroszewicz L. R.
Published: November 2021

Photopolymerization process was used to manufacture polymer microtips on the end of a multi-mode optical fiber and their sorption properties were tested as a transducer of the threshold chemical optical fiber sensor.
Highly sensitive and stable photothermal gas sensor with a hollow-core fiber Fabry-Perot cavity
Authors: Bao Haihong , Hong Yingzhen , Jin Wei , Ho Hoilut , Gao Shoufei , Wang Yingying , Wang Pu
Published: November 2021

We report a high performence all-fiber photothermal gas sensor with a stabilized hollow-core fiber Fabry-Perot interferometer. With 5.5-cm-long hollow-core fiber, we demonstrated acetylene detection down to 2.3 ppb with dynamic range over six orders of magnitude and <3% instability over a period of 24 hours.
Wafer-scale fabrication and transfer of fiber-tip sensors
Authors: Picelli Luca , Sauermann Anne , Hakkel Kaylee , Lindgren Gustav , Fiaschi Niccoló , van Veldhoven René , van der Heijden Rob , Fiore Andrea
Published: November 2021

We developed a high-throughput fabrication method of releasable photonic structures for lab-on-fiber technology. Fiber mounting is achieved without additional ma- chining and preserving the device surface. Our concept is demonstrated with sensing ex- periments.
Pseudo-random phase coded demodulation architecture for wavelength division multiplexed fiber laser sensor arrays
Authors: Foster Scott , Kolodin Alex , Harrison Joanne , Tikhomirov Alexei
Published: November 2021

We report a new technique for demodulation of wavelength division multiplexed fiber laser sensor arrays. It utilises pseudo-random phase coding at the interferometric detection stage and high speed digital signal processing to enable demodulation of multiple sensor channels on a single physical detection and digitisation channel. This archi- tecture has the capacity to greatly reduce the physical size and complexity of the detection system for large arrays. Near thermal noise limited strain sensitivity is demonstrated for a two channel system over a 2 kHz acoustic bandwidth with a data acquisition rate of 1MHz.
Extreme Temperature Resistant Resurgent Regenerated Fiber Bragg Gratings in Six-Hole Microstructured Optical Fiber
Authors: Gunawardena Dinusha Serandi , Law On kit , Liu Zhengyong , Zhong Xiaoxuan , Ho Yuk-Ting , Tam Hwa-Yaw
Published: November 2021

The first observation of resurgence of regenerated fiber Bragg gratings in six-hole microstructured optical fibers useful for temperature sensing beyond 1400 °C is investigated. These R2FBGs can withstand extreme temperatures of up to 1452 °C.
Nanorod-cladding sapphire fiber-based thermometer for extreme condition applications
Authors: Qian Jingjing , Zhao Zijian , Zhang Qinming , Abraham Sunday , Werner Matthew , Petty Randy , Lu Meng
Published: November 2021

This paper reports a new optical fiber thermometer (OFT) for ultra-high temperature measurement under extreme environments, such as in molten steels. This sapphire fiber-based OFT was designed by coating the sapphire fiber core with a nanorod cladding material, which is then housed inside the ceramic tube, the cladded sapphire fiber can collect thermal emissions from ceramic tube and couple the emission to a near-infrared spectrometer with minimal loss. After dipping OFT into molten steel, real-time temperature can be determined by analyzing the emission spectra using a polynomial curve fitting or a machine learning-based classification algorithm.
Opto-mechanical Lab-on-fiber accelerometers
Authors: Bruno Francesco Antonio , Pisco Marco , Gruca Grzegorz , Rijnveld Niek , Cusano Andrea
Published: November 2021

In this work, we report on the realization of Lab on fiber accelerometers based on micro-opto-mechanical cavities on the optical fiber tip. We investigated two sensing configurations. In the former one, the opto-mechanical cavity includes a simple cantilever suspended on the optical fiber end facet. In the latter, the opto-mechanical structure consists of a membrane sustained by four cantilevers. Sensor design was carried out by numerical simulations based on the finite element method. Cantilever based accelerometers have been realized by using a ferrule top approach, whilst membrane based accelerometers have been realized through a photolithographic process followed by a transferring step for the final integration on the optical fiber tip. Different accelerometers have been fabricated with different geometrical features and characterized by using a shaking table. Either cantilever and membrane based Lab on fiber accelerometers exhibited a sensitivity of about 0.1nm/(m/s2) on a 3dB-bandwidth of 5kHz with a resolution down to 100µg/(Hz)1/2.
High Sensitivity Humidity Sensor Based on Side-Polished Eccentric Hole-Assisted Dual-Core Fiber
Authors: Yang Jing , Guan Chunying , Yu Zengxi , Ye Peng , Shi Jinhui , Yuan Libo
Published: November 2021

We demonstrate a high sensitivity humidity sensor based on side-polished hole-assisted dual-core fiber. The experiment results show that the maximum RH sensitivity is -18.94 nm/%RH in the RH range of 70% - 90%. Due to the super-high sensitivity, the proposed sensor will be expected to be a promising candidate for highly sensitive RH sensing applications in high humidity environment.
High Magnetic Field Effect on Magneto-optical Properties of the Terbium-doped Silica Fiber
Authors: Ye Le , Wen Jianxiang , Dong Yanhua , Huang Yi , Pang Fufei , Chen Zhenyi , Wang Tingyun
Published: November 2021

A terbium doped silica fiber is fabricated by MCVD, and treated by high magnetic field. Compare to the untreated fiber, the Verdet constant of the treated fiber is increased by 29%.
Simultaneous measurement of strain and bend with a fiber optic SMS structure
Authors: Markvart Aleksandr A. , Liokumovich Leonid B. , Ushakov Nikolai A.
Published: November 2021

A singlemode-multimode-singlemode sensor able to simultaneously measure strain and curvature at two parts of multimode section is reported. Novel signal processing algorithm for processing spectra of singlemode-multimode-singlemode sensor interrogated by spectral interferometric approach, based on FFT transform is proposed.
High resolution acoustic emission detection system based on 3 × 3 coupler interrogation technology and random fiber laser
Authors: Miao Shuaijie , zhang Wentao , Zhang Haibing , Huang Wenzhu , Song Ying
Published: November 2021

A random narrow linewidth fiber laser with a π-FBG is used as the acoustic emission (AE) sensor. A high AE detection resolution of ~0.281 fε/√Hz and a signal-to-noise ratio of 58 dB are obtained.
Strain and Temperature Characteristics of Cascaded-Chirped Long Period Fiber Gratings Depending on Order of Cladding Mode
Authors: Soares Manuel Guterres , Fukushima Koken , Hung Bui Quoc , Nakaya Koki , Wada Atsushi , Tanaka Satoshi , Ito Fumihiko
Published: November 2021

In this paper we have investigated optical frequency-shift sensitivities of the transmittance channeled spectra of cascaded-chirped long period fiber gratings (C-CLPGs) to the applied strain and temperature change from the viewpoint of the sensor use. In the experiment, several kinds of C-CLPGs have been fabricated by changing the cascaded distance between CLPGs and the strain- or temperature-induced spectral shifts for three different order of the cladding modes are measured simultaneously by use of a cross-correlation technique which provides highly precise determination of the spectral shift. As a result, it is confirmed that the frequency-shift sensitivities of the C-CLPGs to the strain and temperature are larger with the higher order of cladding mode, while the dependences for the temperature sensitivity is much less than that for the strain. In addition, the dependences for the cascaded distance are also investigated.
Micro-structured optical fiber functionalization with magnetic nanoparticles doped sol-gel matrix: application to an all-fiber magnetic field sensor
Authors: Dufour A. , Bsawmaii L. , Jamon D. , Marin E. , Neveu S. , Reynaud S. , Girard S. , Royer F.
Published: November 2021

The functionalization of micro-structured optical fibers can bring new applications for conventional fibers. We present a magneto-optic sensor based on the Faraday effect, through magnetic nanoparticles doped sol-gel thin film coating the fiber core.
Miniature all-fiber Fabry-Perot interferometer
Authors: Zhang Xinpu , Wu Baoyun
Published: November 2021

We propose and experimentally demonstrate a novel miniature all-fiber Fabry-Perot (FP) interferometer. This FP interferometer is formed by an angled fiber, which is made by a simple end-face polishing process.
Multipoint Fiber Optic Refractometer with Optical Frequency Sweeping Non-linearity Compensation
Authors: Esquivel-Hernández Jonathan , Martínez-Manuel Rodolfo
Published: November 2021

A multipoint fiber refractometer using a non-linearity compensation algorithm is presented. This algorithm permits improvement on the system resolution by one order of magnitude and, at the same time, allows the multipoint sensing.
Fiber-Optic Interferometric Sensors with High-Radiation Tolerance and Megahertz Measurement Bandwidth
Authors: Liu Yun , Long Cary D. , Qi Bing , Sangrey Robert , Winder Drew E. , Wendel Mark W.
Published: November 2021

We have developed a fiber-optic low-coherence interferometric sensor with an all-fiber based quadrature phase shifted demodulator. The sensors have been applied to measure megahertz dynamic strains in a high radiation environment.
Towards uniformity of rotational events recording – common test engaging more than 40 sensors including a wide number of fiber-optic rotational seismometers
Authors: Kurzych Anna T. , Jaroszewicz Leszek R. , Dudek Michał , Krajewski Zbigniew , Kowalski Jerzy K. , Bernauer Felix , Wassermann Joachim , Igel Heiner
Published: November 2021

The paper presents initial data obtained during international scientific research which has involved more than 40 various rotational sensors in one place. Authors gathered data by three different optical fiber sensors and show their records correlation.
Dynamics of an Active Nanoparticle in an Optical Trap
Authors: Schmidt Falko , Šípová-Jungová Hana , Käll Mikael , Würger Alois , Volpe Giovanni
Published: November 2021

We investigate a nanoparticle inside an optical trap and driven away from equilibrium by self-induced concentration gradients. We find that a nanoparticle performs fast orbital rotations and its probability density shifting away from equilibrium. © 2021 The Author(s)
Opto-thermoelectric micromachines
Authors: Lin Linhan
Published: November 2021

Harnessing the opto-thermo-electro-mechanic coupling in active particles, we develop two different active opto-thermoelectric micromachines, including the opto-thermoelectric tractor and the self-navigating microswimmers.
Assessment of Retinal Blood Vessel Wall Integrity with Polarization-Sensitive Optical Coherence Tomography as a Disease Biomarker
Authors: Afsharan Hadi , Hackmann Michael J. , Wang Qiang , Joo Chulmin , Silva Dilusha , Cense Barry
Published: November 2021

Thickness and birefringence properties of the vein and artery walls of healthy subjects were quantified following retinal imaging with polarization-sensitive optical coherence tomography and the integrity and structure of vessel walls were assessed.
Design of optical molecular imaging protocols through predictive task-based evaluations
Authors: Tichauer Kenneth M. , Davis Scott C. , Samkoe Kimberley S.
Published: November 2021

A wide range of factors can influence the quality of data obtained through detection and/or imaging of optical molecular probe uptake and retention in biological tissue. With so many options available to probe and detection system designers, this work describes task-based metrics that can enable preliminary selection of the suitable molecular detection/imaging protocols for specific tasks.
Applications of a Novel Translational Fluorescence-guided Surgery Platform
Authors: Lin Christie
Published: November 2021

I will describe the research resulting from preclinical validation of our FDA-cleared imaging device, ranging from microsurgery training to cancer margin assessment, and identify future translational collaboration opportunities.
Quantification of Tissue Oxygenation Using an Intensity-Based Wearable Device and Machine Learning Approaches
Authors: Cascales Juan Pedro , Greenfield Daniel A. , Rousakis Emmanuel , Witthauer Lilian , Li Xiaolei , Goss Avery , Evans Conor L.
Published: November 2021

We report a lightweight, cost-efficient wearable device to measure phosphorescence of an oxygen-sensing dye, leading to an estimation of pO2 through fit-based and machine learning approaches.
In Situ Therapeutic Response Imaging through Quantification of Drug Distribution and Proteomic Response
Authors: McMahon Nathan P. , Solanki Allison , Wang Lei G. , Montaño Antonio R. , Jones Jocelyn A. , Samkoe Kimberley S. , Tichauer Kenneth M. , Gibbs Summer L.
Published: November 2021

Improved therapeutic strategies require unraveling the complex interactions between drug target availability and therapeutic response. Herein, we propose a novel fluorescence imaging platform capable of measuring both with single cell resolution.
Visualizing dynamic processes with rapidFLIMHiRes, the ultra fast FLIM imaging method with outstanding 10ps time resolution
Authors: Loidolt-Krüger Maria , Jolmes Fabian , Patting Matthias , Wahl Michael , Sisamakis Evangelos , Devaux André , Ortmann Uwe , Koberling Felix , Erdmann Rainer
Published: November 2021

PicoQuant’s rapidFLIMHiRes approach redefines Fluorescence Lifetime Imaging (FLIM). Combining fast data acquisition with 10 ps time resolution allows for reliable, quantitative analysis of fast processes like protein interactions, changes in environmental parameters, or metabolic imaging.
Multi-Objective Optimization of Custom Compound Prism Array Design
Authors: Price Liam J. , Tatz Julia , Spring Bryan Q.
Published: November 2021

We provide a robust tool for designing a compound prism array optimized for user specific optical systems. Using python based multi-objective optimization algorithms guided by information theory yields a high speed, customized prism design process.
Outage capacity of underwater FSO systems over scattering-induced fading channels
Authors: Salcedo-Serrano Pedro , Boluda-Ruiz Rubén , Garrido-Balsells José María , García-Zambrana Antonio
Published: November 2021

A novel channel model is proposed to describe the effect of scattering-induced fading in underwater FSO links for different kinds of water. The developed channel model is used to analyze the outage capacity performance.
Impact of Non-Kolmogorov Turbulence on Scintillometer
Authors: Villatoro Cristian , Van Zandt Noah
Published: November 2021

This study uses simulation to explore the effects of experimentally measured non-Kolmogorov turbulence on scintillometer readings. The results show that the useful- ness of the scintillometer readings depends on the turbulence characteristics.
Depolarization of Linearly and Circularly Polarized LiDAR Beam by 61 Solid Targets and its Impact on Detection Range
Authors: Cao Xiaoying , Tremblay Grégoire , Roy Gilles
Published: November 2021

Polarimetric LiDAR can suppress backscattering by aerosols and increase detection contrast. Depolarization by the observed object can hinder those efforts. We present linear and circular depolarization ratios from 61 targets and the impact on contrast.
Stability Enhancement of Quantum Dot Light-Emitting Devices Through Charge Management in the Hole Transporting Layer
Authors: Davidson-Hall Tyler , Aziz Hany
Published: November 2021

A stepwise hole transport layer stack with cascading energy levels improves quantum dot light-emitting device stability by 25x (to 860,000 hours). Prompt and delayed electrical and optical measurements indicate a reduction in hole accumulation.
Confined electron-phonon interaction in GaN/InGaN quantum wells
Authors: Aggarwal Tarni , Ganguly Swaroop , Saha Dipankar
Published: November 2021

Confined electron-phonon interaction is studied in GaN/InGaN quantum wells. Accuracy in scattering rate is compared for bulk and confined phonons. Pump-probe spectroscopy is used to manifest the theoretically obtained values.
Templated Liquid-Phase Epitaxy of InP Structures on Si
Authors: Schneble Olivia D. , Neumann Anica N. , Mangum John S. , Warren Emily L. , Zimmerman Jeramy D.
Published: November 2021

We demonstrate direct and over-dielectric heteroepitaxial growth of InP on Si substrates through templated liquid-phase epitaxy. Large grains (¿5 µm) are indicated by electron channeling contrast imaging and epitaxy is confirmed by x-ray diffraction.
Silicon Photonics Extended-Distributed Bragg Reflector (E-DBR) Lasers for FMCW LiDAR Applications
Authors: Morton P. A. , Xiang C. , Huang D. , Tran M. , Peters J. , Guo J. , Morton M. , Bowers J. E.
Published: November 2021

Silicon Photonics foundry based Extended-Distributed Bragg Reflector (E-DBR) lasers for automotive FMCW LiDAR systems are described, demonstrating record Lorentzian linewidths <240Hz, promising the performance of discrete, commercial, E-DBR lasers, together with low- cost, high-volume, high-reliability manufacturing.
Demodulation of a THz Waveform with a Photomixer
Authors: Constantin Florin Lucian
Published: November 2021

The response at alternative electric fields of a low-temperature-grown GaAs photomixer driven with the optical beat of two continuous-wave lasers is exploited with the optical frequency down-conversion approach for THz-wave heterodyne detection and demodulation.
THz Wave Generation Utilizing Photon-Induced Polarization in a Semiconductor Quantum-Dot Ensemble
Authors: Zhang W-D. , Brown E. R.
Published: November 2021

We describe and present experimental evidence for a mechanism by which photon- assisted polarization current in a semiconductor quantum dot array can produce strong, pulsed THz emission, all at room temperature. Both THz power and waveform are measured and characterized.
A high electric-field enhanced terahertz metamaterials sensor with bowtie triangle ring
Authors: Cui Ning , Guan Min , Zhang Yang , Zeng Yiping
Published: November 2021

A bowtie triangular ring (BTR) metamaterial sensor with strongly enhanced electric- field is designed. The Q factor and sensitivity could be improved through introducing the splits on the BTR , which benefits for the high-accuracy sensing.
Design and fabrication of Ge-on-Si slot waveguide for mid- infrared optical gas sensor
Authors: Lim Jinha , Shim Joonsup , Kim SangHyeon
Published: November 2021

Optical slot waveguide was demonstrated in the mid-infrared at 4.2 μm for gas sensing application on Germanium-on-silicon platform. 0.47 ppm of limit-of-detection for carbon dioxide can be achieved with enhanced confinement factor and propagation loss.
Towards Remote Fiber-Based In Vivo Sensing of Glucose by Near Infrared Spectroscopy
Authors: Fuglerud Silje Skeide , Hjelme Dag Roar
Published: November 2021

A stable and low-noise system is required to measure small changes in bio- chemical constituents such as glucose. We discuss the requirements and limitations to achieve the necessary stability using a supercontinuum source.
Ultra-low noise Brillouin strain sensing using combined Stokes and anti-Stokes interactions
Authors: Murray Joseph B. , Redding Brandon
Published: November 2021

Brillouin-based fiber strain sensors are susceptible to environmental and technical noise. We introduce an approach to suppress the dominant noise sources by combining the complex Stokes and anti-Stokes interactions, enabling strain noise of just 15.6nε/Hz1/2.
Nano-patch Antennas Employing Liquid Gallium for High Performance SEIRAS Sensing
Authors: Miao Xianglong , Liu Peter Qiang
Published: November 2021

We demonstrated a high-performance SEIRAS sensor based on nano-patch antennas for sensing monolayer analyte molecules sandwiched between liquid gallium and gold nano-strips. Close to 10% molecular vibrational absorption due to monolayer 1-octadecanethiol was achieved experimentally.