Attenuation Analysis of Silica-Based Single-Mode Fibers

Heitmann, W.

doi:10.1515/joc.1990.11.4.122

Cited by 13 publications

(5 citation statements)

References 11 publications

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“…The error was computed by a random number generator. After deconvolution by inverting the matrix [3]' the primary measurement error was amplified. A typical result of a single simulation is also shown in Fig.…”

Section: Results Of Computer-simulationsmentioning

confidence: 99%

<title>Interpretation of measured spectral attenuation curves of optical fibers by deconvolution with source spectrum</title>

Hoefle

1991

Fiber-Optic Metrology and Standards

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Nowadays spectral attenuation measurements on optical fibers are performed using high precision, com mercially available measurement equipment and the cut-back technique. Most instruments use a combination of halogen lamp and monochromator and operate with spectral widths of 5-10 nm. Since the spectral width of the absorption peaks of Si-O-H bonds in standard silica fibers is of the same order of magnitude, a significant error is introduced into these measurements. Our simulation show considerable distortion of the measured data. Basically the measured curve is a convolution of the true attenuation curve and the source spectral distribution. When measured curves are to be interpreted we have to deal with the inverse problem, the deconvolution of the respective curves. We have developed an algorithm to compute the true attenuation values from the measured data by numerically deconvoluting the measured curve with the source spectrum. It is shown, how the mathematical problem can be reduced to solving a system of linear equations. The algorithm is very unstable with respect to measurement errors, as a Monte-Carlo-Simulation shows. The necessary stability for practical purposes is achieved by fitting the data with a smooth function prior to the deconvolution. Finally we derive a procedure to deal with practical curves: The measured data are first fitted with a special set of Gauss-functions describing the OH-absorption peak at 1.4 pm.Then we carry out the numerical deconvolution with the source spectrum and repeat the curve-fit performed earlier. By comparing the two fits and their parameter values we discuss the influence of the spectral width.

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Section: Results Of Computer-simulationsmentioning

confidence: 99%

<title>Interpretation of measured spectral attenuation curves of optical fibers by deconvolution with source spectrum</title>

Hoefle

1991

Fiber-Optic Metrology and Standards

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“…The theoretical lower limit of attenuation caused by this effect is shown in Fig. 1 curve c. It was calculated according to [24] taking into account the dispersion correction proposed by [26]. The best result obtained experimentally is shown as curve b.…”

Section: Uv Attenuation At Low Energy Densitiesmentioning

confidence: 98%

“…For low energy densities the dominant loss mechanism in optical fibers apart from distinct OH-and impurity absorption bands is scattering [24][25][26]. In the wavelength range between 400 and 200 nm the attenuation contribution of light scattering increases dramatically proportional to 1/,4.…”

Section: Uv Attenuation At Low Energy Densitiesmentioning

confidence: 99%

<title>Reduction of photodegradation in optical fibers for excimer laser applications</title>

et al. 1992

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Power transmission of excimer laser radiation at 308 nm through waveguides is of growing importance in medical applications. The maximum energy densities achievable at distal fused silica optical fiber ends are limited by the surface damage threshold of fused silica and by photodegradation of the optical fiber material. Limitations due to the surface damage threshold at the front surface can be avoided by applying tapered fiber geometries. In order to minimize photodegradation effects colour center formation caused by high energy UV radiation has to be reduced. This involves optimization of the fused silica material properties and the necessity of modifying the manufacturing processes. Measurements on all silica fibers at 308 nm wavelength (XeCl excimer laser) show different influences of core material manufacturing. Not only the overall decrease of transmission but also the dependence of transmission changes on the number of laser pulses and defect annealing are strongly affected. Consequences for improved performance of all silica optical fibers in angioplasty are demonstrated by measurements on specially produced samples.

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“…This leads to Rayleigh scattering and is proportional to 1 λ 4 [30,31]. In addition, scattering can also occur at the core-cladding interface, where the surface roughness leads to a loss due to the imperfection [7].…”

Section: Sources Of Light Attenuation In Pcfsmentioning

confidence: 99%

Novel aspects of pulse propagation in photonic crystal fibers

2011

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The study of nonlinear pulse propagation in photonic-crystal fibers (PCFs) produced new opportunities in fiber-optical research, mainly due to the unique guiding properties of the PCFs. The light is strongly confined to a small area of glass, thus enhancing the interaction of the light with the silica molecules. This caused a widespread distribution of the PCFs for various applications. Still, the demand for fiber-based light sources, having tailored light properties, grows steadily. This gives the motivation for thesis: The study of light traversing PCFs with engineered and unconventional dispersion landscapes. For this work, a large range of different shapes was realized by postprocessing several stock PCFs. Additionally, numerical modeling of light propagation in the devices assisted to understand the governing physical mechanisms.One part of this thesis shows that the influence of the core and cladding geometry on the modal properties can be adjusted to achieve efficient supercontinuum generation, novel pulse shaping mechanisms or nonlinear wavelength conversion. At the beginning we report on novel temporal and spectral modulations in short pieces of highly nonlinear PCFs. In optical fibers the evolution of the propagating light is usually governed by the interplay between the nonlinearity and dispersion of the fiber. In highly nonlinear PCFs this balance can be strongly biased in favor of the nonlinearity, and soliton formation is initially suppressed. Instead, a train of ultrashort pulses develops, having repetition rates in the THz region. We demonstrate the generation of a train of 50 fs pulses with a repetition rate as high as 14 THz; the length of the PCF was only a few centimeters.We discuss the tunability of the pulse-train parameters by the laser and fiber parameters.PCFs can be fabricated to have a submicron core region, which maximizes the nonlinear coefficient. Short pieces of these devices can be used to control the spectrum of laser pulses, for low threshold pump powers. The spectral brightness can be adjusted by the pump wavelength. These fibers are promising candidates for white-light sources with repetition rates in the GHz range.Additionally, the unique dispersion shape and the pronounced frequency dependence of the non-IV linearity of submicron-core PCFs result in unexpected soliton dynamics. Light launched at the maximum dispersion point leads to surprisingly strong and multiple soliton interactions. The proximity of a zero-dispersion point increases the energy transfer into linear radiation by more than 25%, destroying afterwards the existence of one of the solitons.In the next step, the influence of the microstructured cladding on the overall dispersion is balanced to create three zero-dispersion points close to each other, while still being endlessly single-mode.This scenario results in unexpected behavior -both for quasi-CW light and ultrashort pulses.It is shown numerically that fibers of this type offer highly unconventional phase-matching landscapes for four-wave mixing (FW...

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Attenuation Analysis of Silica-Based Single-Mode Fibers

Cited by 13 publications

References 11 publications

<title>Interpretation of measured spectral attenuation curves of optical fibers by deconvolution with source spectrum</title>

<title>Interpretation of measured spectral attenuation curves of optical fibers by deconvolution with source spectrum</title>

<title>Reduction of photodegradation in optical fibers for excimer laser applications</title>

Novel aspects of pulse propagation in photonic crystal fibers

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