1,720,999 research outputs found
Back-compatibility of hollow core fibers with SMF infrastructure
No full textLight propagating through an empty core of hollow core fibers experiences low-nonlinearity combined with low chromatic dispersion, broadband transmission, low back-scattering, and low signal propagation time. We will discuss challenges and solutions how to integrate them into current single-mode fiber (SMF)-based systems.</p
Interconnectivity between effectively single-moded antiresonant hollow core fibres and conventional single-mode fibres
No full textWe review the topic, focusing first on a discussion of the key parameters, limits of coupling loss, and measurement techniques. We then follow by reviewing the literature, including mode-field adaptation methods, and assembly approaches. Finally, we briefly cover the topic of hollow core fibre connection with non-standard single mode fibres, and finish with a review of components that can be made directly within the connection. We conclude with a summary of key achievements and present our view on key remaining challenges
Dataset supporting the publication "End-capping hollow-core fibers with suppressed coupling into higher-order modes"
No full text*This dataset supporting the publication:
Zhong, A., Ding, M., Numkam Fokoua, E., Zvanovec, S., Poletti, F., Komanec, M., & Slavík, R. (in press). End-capping hollow-core fibers with suppressed coupling into higher-order modes. IEEE Journal of Selected Topics in Quantum Electronics.
https://doi.org/10.1109/JSTQE.2024.3381797</span
Connecting hollow-core and standard single-mode fibers with perfect mode-field size adaptation
No full textWe propose an approach to interconnect a hollow-core fiber (HCF) of arbitrary core size with standard single-modefiber with perfect mode-field size adaptation and experimentally achieve for the first time insertion loss agreeing with thatpredicted by simulations. We demonstrate this using three low-loss HCFs, including 1st window nested antiresonant nodeless fiber (NANF), 2nd window NANF and the state-of-the-art double NANF (DNANF). The connection with a minimum achieved insertion loss of 0.079 dB was permanently secured via gluingand did not degrade during 4 weeks of continuous measurement. To the best of our knowledge, this is the lowest reported value and is comparable to or lower than the connection between dissimilar single-mode fibers (e.g., standard single-mode fiber and dispersion-compensating fiber). We also show that such connection leads to excellent suppression of higher-order modes coupling, of importance to all applications sensitive to multi-path interference. Importantly, obtaining agreement between simulations and experiments validates for the first time the accuracy of the simulations and opens the door to further optimization via simulations with the ability to subsequently achieve the same result experimentally
Hollow-core to standard fiber interconnection with customized air-gap distance
No full textBy modifying the design of the interconnection between standard and hollow-core fibers, we achieved low insertion loss while creating a gap in between. This will allow for insertion of thin optical elements such as filters
Dataset in support of the journal article 'All-fiber hollow-core fiber gas cell'
No full textData for figues in the article 'All-fiber hollow-core fiber gas cell' (in press) Optical Fibre Technology
Uploaded Archive (ZIP) includes 3 data files that are purely numerical (.xlsx)
The figures are as follows:
Fig. 2:
Fig2_AR_Coated_MFA.xlsx Measured back-reflection of the AR-coated SMF+GRIN mode-field adapter compated to a flat surface of an uncoated mode-field adapter.
Fig. 6:
Fig6_Gas_cell_transmission.xlsx Measured transmission spectra of the HCF gas cell during purging with Argon.
Fig.7:
Fig7_Gas_cell_transmission_FP.xlsx Gas cell transmission measured at high resolution for gas cells with AR-coatings and without coating, showing parasitic Fabry-Perot resonances.
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Gap design to enable functionalities into nested antiresonant nodeless fiber based systems
No full textBy modifying the interconnection design between standard single-mode fiber (SSMF) and nested antiresonant nodeless type hollow-core fiber (NANF), we create an air gap between SSMF and NANF. This air gap enables the insertion of optical elements, thus providing additional functions. We show low-loss coupling using various graded-index multimode fibers acting as mode-field adapters resulting in different air-gap distances. Finally, we test the gap functionality by inserting a thin glass sheet in the air gap, which forms a Fabry-Perot interferometer and works as a filter with an overall insertion loss of only 0.31 dB
Data for article "Connecting hollow-core and standard single-mode fibers with perfect mode-field size adaptation"
No full textAll data presented graphically in the article they underpin are given in this data file. The article title is: Connecting hollow-core and standard single-mode fibers with perfect mode-field size adaptation, published in Journal of Light Technology 2023.</span
Refractometric Detection of Liquids Based on Microstructured Optical Fibers
No full textTématem diplomové práce je refraktometrická detekce kapalin s využitím mikrostrukturních optických vláken. V teoretické části jsou rozebrány druhy mikrostrukturních optických vláken, jejich vlastnosti a použití v praktických aplikacích. V této části jsou popsány i počítačové simulace, jež vytvořily podklady pro experimentální praktickou část. V praktické části jsou následně uvedeny postupy měření a dosažené výsledky refraktometrické detekce kapalin. Pro účel měření byly jako experimentální kapaliny použity etylalkohol a isopropylalkohol. Měření bylo provedeno s vlákny typu Suspended Core a Photonic Crystal Fiber.The theme of the Diploma Thesis is utilizing of microstructural optical fibers for refractive index detection of liquids. In the theoretical part there is a description of Mictrostructural optical Fibers, their characteristics and real applications. The outcome of computer simulation forms the basis for the experimental part. The experimental part then describes measurement method, which has been used for refractive index detection of liquids and presents the results of experimental testing. Ethyl alcohol and Isopropyl alcohol were used as tested liquids and Suspended Core a Photonic Crystal Fiber were used for measurement purposes
Signal Processing Methods and Collision Situation Prediction Using Sensory Systems Based on Fiber Bragg Gratings
Get PDFSystémy včasného varování před sesuvy půdy mají zásadní význam pro ochranu osob nebo staveb v jejich blízkosti. Vláknové Braggovské mřížky (FBG) představují vhodný senzor pro použití v takových scénářích díky své extrémní citlivosti na deformace, nízké ceně a snadnému nasazení. V této práci představuji senzorovou síť založenou na FBG pro monitorování kolizních stavů na svazích pomocí kompozitně zabudovaných FBG. Byla navržena topologie FBG senzorové sítě a techniky zpracování dat. Dále jsem provedl pilotní měření FBG senzorů vedoucí k zabudování FBG senzorů do kompozitního materiálu. Experimentální část pak dále zahrnuje simulaci sesuvu půdy a dlouhodobé sledování umělého svahu s řízenými srážkovými podmínkami. Umělé neuronové sítě jsou použity k predikci signálu získaného z dlouhodobých měření se směrodatnou odchylkou u testovacího datasetu 0,4 pm a střední absolutní chybou 0,17 pm.Early-warning systems for landslides are essential for the protection of people or structures nearby. Fiber Bragg gratings (FBGs) present a suitable sensor for use in such scenarios due to their extreme sensitivity to strain, their low cost, and their easy deployment. Here, I present an FBG sensor network for slope collision state monitoring, using composite-embedded FBGs. I propose an FBG sensing network topology and data processing techniques. Then, I carry out FBG sensor pilot measurements leading to embedding of FBG sensors into composite material. The experimental campaign then includes landslide simulation and long-term monitoring of an artificial slope with controlled rainfall conditions. Artificial neural networks are used to predict the signal obtained from long-term measurements with a test set root mean squared error of 0.4 pm and a mean absolute error of 0.17 pm
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