Linear and nonlinear optical fibre devices

Goure, J. P.; Verrier, Isabelle; Meunier, Jean-Pierre

doi:10.1088/0022-3727/22/12/001

Cited by 9 publications

(1 citation statement)

References 121 publications

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“…Beyond the immediate context of TWPAs, our method of characterising nonlinearities can prove useful in the analysis of other superconducting nonlinear devices. Examples of these devices include parametric up-converters [4], kinetic inductance spectrometers [52], fibre based nonlinear devices [53], and resonator parametric amplifiers [54]. Similar to a TWPA, these nonlinear devices also exploit the underlying superconducting nonlinearities.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear mechanisms in Al and Ti superconducting travelling-wave parametric amplifiers

Zhao,

Withington,

Thomas

2022

Preprint

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The underlying nonlinear mechanisms behind the operation of travelling-wave parametric amplifiers (TWPAs) are important in determining their performance in terms of added noise, maximum gain, and bandwidth. We describe a method of characterising the underlying nonlinearity of a superconducting material in terms of its dissipative-reactive ratio and the response time of the underlying microscopic processes. We describe and calculate the different behaviour arising from the equilibrium supercurrent nonlinearity, which has low dissipation and fast response time, and the non-equilibrium heating nonlinearity, which has high dissipation and slow response time. We have fabricated TWPAs based on Al and Ti, and characterised their nonlinearities using our analysis. For both Al and Ti, the measured dissipative-reactive ratios and response times are quantitatively similar to predictions for the non-equilibrium heating nonlinearity. In line with this, we were able to obtain more than 20 dB of peak power gain, although only over a narrow bandwidth of a few kilohertz.

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Section: Discussionmentioning

confidence: 99%

Nonlinear mechanisms in Al and Ti superconducting travelling-wave parametric amplifiers

Zhao,

Withington,

Thomas

2022

Preprint

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Biosensors and Chemical Sensors Based Upon Guided Optics

Goure¹,

Blum²

2013

Chemical and Biological Microsensors

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Matching of a Bent Step‐Index Single‐Mode Fiber by a Modal Equivalent Slab Waveguide Structure

Haubenreißer¹,

Ecke²,

Schröter³

et al. 1994

Physica Status Solidi (b)

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A novel procedure of matching the modal properties of a bent step-indcx single-mode fiber (BSSF) by the ones of an equivalent slab waveguide (ESW) structure is presented. On applying this procedure the actual BSSF structure is modelled in the first step by an equivalent straight anisotropic single-mode fiber (SASF) and in the second step this SASF structure is modally matched by an ESW structure. It is shown that for given BSSF (or SASF) input parameters only the derived ESW parameters can describe the modal features (birefringence, cut-off thickness and wavelength, single-mode operation range as well as the numerical aperture) of an actual BSSF structure rigorously and consistently within the framework of a slab model analysis.Es wird ein neuartiges Verfahren zur Anpassung der modalen Eigcnschaften einer gekriimmten Stufen-Index-Monomode-Faser (BSSF) an die einer aquivalenten planarcn Wellenleiter (ESW)-Struktur vorgestellt. Dabei wird die reale BSSF-Struktur durch eine aquivalente gerade anisotrope Monomode-Faser (SASF) modelliert und diese SASF-Struktur an eine ESW-Struktur modal angepaI3t. Es wird gezeigt, daI3 bei Vorgabe der BSSF-oder SASF-Parameter nur mit den abgeleiteten ESW-Parametern eine rigorose und konsistente Beschreibung der modalen charakteristischen Eigenschaften (Doppelbrechung, Abschneide-Dicke und -Wellenliinge, numerische Apertur und Monomode-Betriebsbedingung) einer realen BSSF-Struktur auf der Basis eines Planar-Modells erfolgen kann.') Helmholtzweg 4,

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Linear and nonlinear optical fibre devices

Cited by 9 publications

References 121 publications

Nonlinear mechanisms in Al and Ti superconducting travelling-wave parametric amplifiers

Nonlinear mechanisms in Al and Ti superconducting travelling-wave parametric amplifiers

Biosensors and Chemical Sensors Based Upon Guided Optics

Matching of a Bent Step‐Index Single‐Mode Fiber by a Modal Equivalent Slab Waveguide Structure

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