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Passively Q-Switched All-Fiber Yb-Doped Lasers Based on Nonlinear Multimode Interference?
摘要： We report a passively Q-switched all-?ber Yb-doped laser using the structure of step-index multimode ?ber and graded-index ?ber (SIMF-GIMF) as a new saturable absorber (SA) based on the nonlinear multimode interference (NL-MMI). Through bending the SA to a certain state, we obtain a stable Q-switched laser operation with the shortest pulse duration of 4.37 μs and a corresponding repetition rate of 147.6 kHz with center at 1,039 nm. The maximum average output power and single pulse energy are recorded to be 2.409 mW and 16.3 nJ, respectively. To the best of our knowledge, this paper con?rms experimentally for the ?rst time Q-switched laser operation based on SIMF-GIMF SA in all-?ber lasers. In addition, we also observed unstable Q-switched mode-locking operation. All-?ber lasers based on SIMF-GIMF SA are attractive for practical applications and undergo no damage and performance degradation with time.
关键词： multimode ?bers,all-?ber Yb-doped lasers,Q-switched operation
更新于2025-11-28 14:24:03
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Amorphous silicon and silicates-stabilized ZrO2 hollow fiber with low thermal conductivity and high phase stability derived from a cogon template
摘要： ZrO2 ?bers are used as refractory materials owing to their excellent thermal resistance and thermal stability. Natural cogon ?ber is a type of hollow Gramineae ?ber, and usually contains a small amount of amorphous silicon and silicates, such as SiO2, MgSiO3, CaSiO4, and Al2SiO5, which can e?ectively avoid the phase transition of ZrO2. In this study, hollow ZrO2 ?bers with remarkable thermal insulation and phase stability were synthesized using a cogon ?ber template. The results showed that the ?nal ZrO2 ?bers successfully inherited the hollow structure and amorphous substance from the cogon template. The hollow structure of the biomorphic ZrO2 ?ber helped prevent heat ?ow more e?ciently compared to solid ?bers and reduced the thermal conductivity to a signi?cant extent. In addition, the amorphous silicon and silicates played an important role in the phase stability of tetragonal ZrO2; the transformation from the tetragonal to monoclinic phase was avoided at room temperature and in humid environment.
关键词： Thermal conductivity,Amorphous silicon and silicates,Cogon ?bers,Phase stability,ZrO2 hollow ?bers
更新于2025-09-23 15:23:52
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Large diameter fiber-optics tweezers for Escherichia coli bacteria manipulation
摘要： Large diameter ?ber-optics tweezers are proposed in this paper, and their ability to trap and deliver Escherichia coli (E. coli) bacteria was characterized. The tweezers were formed by tapering four-mode ?ber (FMF) with 8.7 μm diameter, allowing the resonance ?eld of the extended high-order modes to be used for manipulating the micro-objects. The diameter of the FMF taper was much larger than that of reported ?ber-optic devices with nanoscale diameter, thereby making the device work as sturdier tweezers. The key factor for success is that, along the light transmission axis, the higher order modes have a unique mode ?eld that extends longer and with a larger range around the ?ber waist than the fundamental mode. At wavelengths ranging from 1500 to 1600 nm, especially close to 1560 nm, trapping and delivering of E. coli along the ?ber was observed. In addition, a further demonstration for operation time shows a larger tapered ?ber diameter was able to extend the service life of tweezers. The higher order micro-?ber modes offer a new opportunity for optical manipulation at the single-cell level.
关键词： Biophotonics,?ber-optics tweezers,optical ?bers
更新于2025-09-23 15:21:21
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Phase separation and transformation of binary immiscible systems in molten core-derived optical fibers
摘要： This work studies phase-separated ?bers in the CaO–SiO2 and NiO–SiO2 systems. The nature of the phase-separated microstructures and underlying phase equilibria are discussed, including dimensionality, composition, and phase formation as well as the realization of ferrimagnetic behavior in the NiO–SiO2 ?bers based on the formation of metallic Ni inclusions. In addition to understanding the composition/processing relationships in these systems, the work represents a step forward toward novel magneto-optic ?bers. It is important to understand the underlying materials science in order to advance the properties of novel optical ?bers possessing engineered heterogeneities in the core.
关键词： CaO–SiO2,ferrimagnetic behavior,phase-separated ?bers,NiO–SiO2,magneto-optic ?bers
更新于2025-09-23 15:21:01
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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Bend Loss Properties of the Octagonal-core and Nodeless Large-mode-area Anti-resonant Hollow-core Fibers
摘要： We report the results of the numerical and experimental comparison of bend loss properties for two di?erent silica-based anti-resonant hollow-core ?bers (AR-HCFs) at the wavelength of 2.25 μm with the mode area larger than 1000 μm2. The ?rst ?ber has a negative curvature of the core-cladding boundary formed by eight touching trapezoidal capillaries and the second one has the nodeless structure designed by six non-touching round capillaries.
关键词： octagonal-core,bend loss,large-mode-area,anti-resonant hollow-core ?bers,nodeless
更新于2025-09-23 15:21:01
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Vapor Sensing with Polymer Coated Straight Optical Fiber Microtapers Based on Index Sensitive Interference Spectroscopy of Surface Stress Birefringence
摘要： Optical micro?ber tapers provide an advantageous platform for sensing in aqueous and gas environments. We study experimentally the photonic transmission in optical ?ber tapers coated with polymethyl methacrylate (PMMA), a polymeric material widely used in optical applications. We demonstrate a durable and simple humidity sensing approach incorporating tapered micro?bers attached to silicon (Si) substrate coated with active polymer layer. A model is described for the load stress effect on the birefringence giving rise to interferences in the transmission spectra, strongly dependent on the coating layer thickness, and disappearing following its slow uniform removal. The sensing approach is based on characterization of the interference patterns observed in the transmission spectra of the taper in the NIR range. The device demonstrated persistent detection capability in humid environment and a linear response followed by saturation to calibration analytes. In each analyte of interest, we de?ne principal components and observe unique calibration plot regimes in the principal component space, demonstrating vapor sensing using polymer coated microtapers.
关键词： microstructured ?bers,optical resonators,optical sensing
更新于2025-09-23 15:21:01
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Progress toward third-order parametric down-conversion in optical fibers
摘要： Optical ?bers have been considered an optimal platform for third-order parametric down-conversion since they can potentially overcome the weak third-order nonlinearity by their long interaction length. Here we present, in the ?rst part, a theoretical derivation for the conversion rate both in the case of spontaneous generation and in the presence of a seed beam. Then we review three types of optical ?bers and we examine their properties in terms of conversion ef?ciency and practical feasibility.
关键词： optical ?bers,phase matching,nonlinearity,photon triplet states,third-order parametric down-conversion
更新于2025-09-23 15:19:57
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Polymer Optical Fibers for Sensing
摘要： Sensing techniques based on optical ?bers are used in numerous key ?elds. For example, optical ?ber sensors are exploited in medical diagnostics, environmental monitoring, physical parameters detection, industrial applications, food safety, and security. In fact, optical ?ber sensors are used for their numerous capabilities, as for example when in the detection fast, portable, low-cost, small size, and/or rugged sensor systems are needed. In general, the optical ?ber for sensing applications can be a glass one, a specialty one, or a polymer one. Polymer optical ?bers (POFs) are especially advantageous due to their excellent ?exibility, easy manipulation, large diameter, resilience, and the fact that plastic is able to withstand smaller bend radii than glass. These POF sensors, intrinsic and extrinsic, combined with di?erent kinds of receptors can be directly connected to an online platform by interface software, allowing storing, analyzing, and displaying the sensor’s data, to realize low-cost biochemical sensors for several applications. In this work, two plasmonic POF sensors, one intrinsic and another one extrinsic, that can be used in biochemical applications are described.
关键词： optical sensors,intrinsic and extrinsic optical ?ber sensors,polymer optical ?bers,plasmonic sensors,biosensors
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Investigation of degradation observed on recent polycrystalline silicon PV modules installed in desert region
摘要： Multicore ?bers and few-mode ?bers have potential application in realizing dense-space-division multiplexing systems. However, there are some tradeoff requirements for designing the ?bers. In this paper, the tradeoff requirements such as spatial channel count, crosstalk, differential mode delay, and cladding diameter are discussed. Further, the design concept and transmission characteristics of high-core-count single-mode multicore ?bers are discussed. A heterogeneous multicore ?ber with 30 cores and quasi-single-mode multi-core ?bers with 31 cores are developed.
关键词： Optical ?ber,optical ?bers communication
更新于2025-09-19 17:13:59
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Modal delay and modal bandwidth measurements of bi-modal optical fibers through a frequency domain method
摘要： We propose a simple and robust frequency domain method for measuring modal delay and bandwidth of bi-modal optical ?bers. An analytical transfer function model is formulated showing excellent agreement with experimental results for relatively short ?bers. Using the model, a full set of information can be extracted, including modal delay and modal bandwidth under any launch conditions. As a result, one can obtain a worst-case modal bandwidth that can gauge the ?ber modal bandwidth under general conditions. In addition, the frequency domain measurement method and the analytical model are validated through the excellent agreements with the time domain measurement results. The analytical model is also generalized for longer ?ber lengths when additional degradation e?ects become signi?cant to alter the behavior of the transfer function. Through the detailed study, we show that the simple frequency domain measurement method as facilitated by the analytical model can deliver a full set of modal delay and modal bandwidth information that otherwise requires more complex method of di?erential mode delay measurements.
关键词： Optical ?ber communications,Data center,Fiber modal bandwidth,Bi-modal ?bers
更新于2025-09-19 17:13:59