scholarly journals Cavity Formation Modeling of Fiber Fuse in Single-Mode Optical Fibers

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Yoshito Shuto
Keyword(s):  
Optical Fibers ◽  
Nonlinear Oscillation ◽  
Relaxation Oscillation ◽  
Core Layer ◽  
Single Mode ◽  
Core Material ◽  
Cavity Formation ◽  
Van Der Pol Equation ◽  
Van Der Pol ◽  
The Core

The evolution of a fiber-fuse phenomenon in a single-mode optical fiber was studied theoretically. To clarify both the silica-glass densification and cavity formation, which have been observed in fiber fuse propagation, we investigated a nonlinear oscillation model using the Van Der Pol equation. This model was able to phenomenologically explain both the densification of the core material and the formation of periodic cavities in the core layer as a result of a relaxation oscillation.

scholarly journals Heat Conduction Modeling of Fiber Fuse in Single-Mode Optical Fibers

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Yoshito Shuto
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Elevated Temperatures ◽  
Core Layer ◽  
Single Mode ◽  
Vitreous Silica ◽  
Optical Absorption Coefficient ◽  
Average Temperature ◽  
The Core ◽  
Explicit Finite Difference

The unsteady-state thermal conduction process in single-mode optical fiber was studied theoretically with the explicit finite-difference method. We assumed that the vitreous silica optical fiber underwent pyrolysis at elevated temperatures to form SiOx (x~1). We also proposed a model in which the optical absorption coefficient of the core layer increased with increasing molar concentration of SiOx. The core-center temperature changed suddenly and reached over 3×104 K when a 1.064-μm laser power of 2 W was input into a short core layer of 40 μm length, which was heated at 2923 K. This thermal wave, that is, a fiber fuse, increased in size and propagated toward the light source at a rate of about 0.54 m/s. The calculated propagation velocity of the fiber fuse was in agreement with the experimental value. Moreover, the average temperature of the radiated region of the core layer gradually approached a temperature of about 5700 K. It was found that the final average temperature was close to the experimentally reported values.

Graded-Index and Single-Mode Polymer Optical Fibers

1992 ◽  
Vol 247 ◽  
Author(s):  
Yasuhiro Koike
Keyword(s):  
Mechanical Properties ◽  
Optical Fibers ◽  
Single Mode ◽  
Polymer Optical Fiber ◽  
Core Diameter ◽  
Graded Index ◽  
The Core ◽  
High Bandwidth ◽  
Polymer Optical Fibers ◽  
First Time

ABSTRACTHigh-bandwidth graded-index (GI) polymer optical fiber (POF) and single-mode POF with good mechanical properties were successfully obtained by our interfacial-gel polymerization technique. The bandwidth of the GI POF is about 1 GHz · km which is two hundred times larger than that of the conventional step-index (SI) POF. The minimum attenuation of transmission is 56 dB/km at 688-nm wavelength and 94 dB/km at 780-nm wavelength. The single-mode POF in which the core diameter was 3–15 μ m and the attenuation of transmission was 200 dB/km at 652-nm wavelength was successfully obtained for the first time.

scholarly journals ANALISIS REDAMANTERHADAP PERFORMANCEDENSE WAVELENGTH DIVISION MULTIPLEXING (DWDM)PADA SISTEM KOMUNIKASI SERAT OPTIKDENGAN METODE LINK POWER BUDGET DI PT. TELKOM PADANG (STUDI KASUS LINK PADANG – LUBUK BASUNG)

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Farta Wendy Herdianta ◽  
Hanesman Hanesman ◽  
Delsina Faiza
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Wavelength Division Multiplexing ◽  
Power Output ◽  
Communication Systems ◽  
Single Mode ◽  
Optical Fiber Communication ◽  
Power Budget ◽  
Fiber Communication ◽  
The Core

The research was conducted by analyzing the optical fiber attenuation of the DWDM performance in terms of power received on optical fiber communication systems link Padang-Lubuk cone in PT. Telkom Padang. Optical fiber has a very small damping. Therefore optical fibers become the primary choice in telecommunications networks. To improve the transmission quality is better then the use of DWDM technology, DWDM technology is a method to insert a number of channels were transmitted in a single optical fiber. Instruments in this study is the Power Meter and OTDR JDSU MTS-2000 type, the type of cable used G.655 Single Mode type. Link Power Budget method is used to determine the performance of DWDM caused by attenuation based on the value of the received power output receiver. On the link Padang - Lubuk cone highest attenuation occurs in core 1 of 29.742dB with 100.035 km cable lengths, and the core 10 of 31.8 dB with 119.998 km cablelengths. Based on the large fault or attenuation/km core 1 of 0.297 dB/km, the core 10 of 0.265 dB/km and the standard ITU-T was 0.35 dB/km. Value attenuation/km core 1 and core 10 is still in normal conditions and under standard ITU-T 0.35 dB/km. Based on optical fiber attenuation, the results of analysis of the link power budget is the value of Rx is smaller than the value of Rx sensitivity of -27 dBm, it can be said performance DWDM optical fiber communication systems in normal and can be used to operate because the power output can still be accepted by receiver in the device. Keywords:optical fiber cable, optical fiber attenuation, DWDM, link power budget.

scholarly journals Microscopy characterization of doped fibers

2004 ◽  
Vol 22 (3) ◽  
pp. 351-354 ◽  
Author(s):  
M. MILANI ◽  
D. BATANI ◽  
M. BALLERINI ◽  
A. POZZI ◽  
C. SAVOIA
Keyword(s):  
Spatial Resolution ◽  
Optical Fibers ◽  
Single Mode ◽  
Dopant Distribution ◽  
X Ray ◽  
The Core ◽  
Microscopy Technique ◽  
Doped Fibers ◽  
Microscopy Characterization

The use of the Soft X-ray Contact Microscopy technique is discussed as a possible new tool to get information on dopant distribution in the core of single-mode optical fibers with 50 nm spatial resolution.

scholarly journals PERIODIC SOLUTIONS AND SLOW MANIFOLDS

2007 ◽  
Vol 17 (08) ◽  
pp. 2533-2540 ◽  
Author(s):  
FERDINAND VERHULST
Keyword(s):  
Perturbation Theory ◽  
Singular Perturbation ◽  
Periodic Solutions ◽  
Relaxation Oscillation ◽  
Slow Manifold ◽  
Logistic Equation ◽  
Singular Perturbation Theory ◽  
Geometric Singular Perturbation Theory ◽  
Van Der Pol Equation ◽  
Van Der Pol

After reviewing a number of results from geometric singular perturbation theory, we give an example of a theorem for periodic solutions in a slow manifold. This is illustrated by examples involving the van der Pol-equation and a modified logistic equation. Regarding nonhyperbolic transitions we discuss a four-dimensional relaxation oscillation and also canard-like solutions emerging from the modified logistic equation with sign-alternating growth rates.

Tension and compression of sandwich composites with weft-knit fabric cores

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040004
Author(s):  
Jieng-Chiang Chen ◽  
Yi-Fang Zhuang
Keyword(s):  
Compressive Force ◽  
Core Layer ◽  
Longitudinal Force ◽  
Test System ◽  
Core Material ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
Carbon Fabric ◽  
The Core ◽  
Tension And Compression

The manufacturing techniques of sandwich composites containing core layers of weft-knit glass fabric (WG) and weft-knit carbon fabric (WC) with carbon fabric skin layers are discussed herein. The core layers of the sandwich composites were fabricated with WG-reinforced epoxy (E) resin, WC-reinforced epoxy resin, and polyurethane foam (F). The core layer was then stacked with two pieces of carbon fabric on the top and bottom surfaces to fabricate the sandwich composites. Three sandwich composites [plain carbon fabric sandwich composite with a WG core layer (C/E/WG), plain carbon fabric sandwich composite with a WC core layer (C/E/WC), and plain carbon fabric sandwich composite with an F core layer (C/E/F)] were developed in this study. A two-step manufacturing procedure was developed to achieve sufficient adhesiveness between the skin and core layers. The tensile, flatwise compressive, and longitudinal compressive properties of these sandwich composites were measured according to referred ASTM standards on a materials test system (MTS 810). Experimental results revealed that the WC core materials displayed excellent resistance to a flatwise compressive force and the foam core material show weak resistance. Under longitudinal compression, the skin and core layer of the C/E/F specimen separated, indicating that the C/E/F specimen could not withstand longitudinal force. Moreover, the C/E/WG and C/E/WC specimens both bend at the end of the same test.

Effects of Normal Strain in Core Material on Modal Property of Sandwich Plates

1997 ◽  
Vol 119 (4) ◽  
pp. 493-503 ◽  
Author(s):  
Byung-Chan Lee ◽  
Kwang-Joon Kim
Keyword(s):  
Elastic Modulus ◽  
Shear Modulus ◽  
Layer Thickness ◽  
Dynamic Modeling ◽  
Core Layer ◽  
Base Layer ◽  
Core Material ◽  
Sandwich Plates ◽  
The Core ◽  
Plate Length

In vibration analysis of sandwich beam/plates, it is often assumed that there is shear deformation only, without extension or compression in the viscoelastic layer. Certainly, this assumption may have limitations, for example, with increase of the core thickness or frequency range of vibration. The purpose of this paper is to consider the normal, as well as shear strain of the core material for modal parameter estimation of the sandwich plates and to investigate how much error will be caused by neglecting the extension or compression in the core material. Natural frequencies and modal loss factors are estimated for a simply supported square plate by taking the normal as well as shear deformation into account for dynamic modeling. Nondimensional characteristic equations are formulated and solved numerically for various ratios of the base layer thickness to plate length, core layer thickness to base layer, constraining layer thickness to base layer, and shear modulus of core material to elastic modulus of base layer. The effects of the various parameters on the modal properties are shown to be intercorrelated to each other and hence difficult to summarize in one phrase. Normal deformation of the core material plays an important role when the thickness ratio of constraining layer to base layer is 0.5 and its Poisson’s ratio is smaller than 0.49, and hence need to be included in the dynamic modeling especially for estimation of modal damping when one of the following conditions are met; 1) the ratio of base layer thickness to plate length is greater than 0.02, 2) the thickness ratio of core layer to base layer is greater than 0.01, 3) the wavelength of a mode is less than one third of the plate length, 4) the ratio of shear modulus of core material to elastic modulus of base material is less than 10−5.

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