UV laser processing and multiphoton absorption processes in optical telecommunication fiber materials

Lancry, Matthieu; Poumellec, Bertrand

doi:10.1016/j.physrep.2012.09.008

Cited by 53 publications

(22 citation statements)

References 156 publications

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“…( (46) In conclusion, the VAREPA approach can be applied to any distribution performing at the end of a deconvolution. For instance, in the case of a square distribution (Figure 47), such as when the low Ge-doped fiber is hydrogen loaded, the edge of the distribution will be smoothed, giving rise at the beginning of the reaction to a simple exponential behavior on time.…”

Section: Narrow and Steep Distribution Functionmentioning

confidence: 96%

“…The determination of this k0 dependence has been recently reviewed in Reference [46]. Of course, non-linear dependence on P combined with the non-linear behavior on k0t will lead to a distortion of the interference pattern and to bandwidth broadening.…”

mentioning

confidence: 99%

“…We have shown a development of a framework for modeling the thermally activated processes, either for creating or erasing species, such as the ones involved in UV-induced refractive index changes [46], based on distributed activation energy of a physico-chemical reaction. From experimental measurements (isochrons and isotherms), this framework allows to find the distribution function, providing only a constant, which can be determined by a simple variable change when a few assumptions are verified.…”

mentioning

confidence: 99%

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Kinetics of Thermally Activated Physical Processes in Disordered Media

Poumellec

Lancry²

2015

Fibers

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Abstract:We describe a framework for modeling the writing and erasure of thermally-distributed activated processes that we can specifically apply to UV-induced refractive index change, particularly in fibers. From experimental measurements (isochrons and/or isotherms), this framework allows to find the distribution function of the activation energy by providing only a constant, which can be determined by a simple variable change when a few assumptions are fulfilled. From this modeling, it is possible to know the complete evolution in time of the system. It is also possible to determine the annealing conditions for extending a lifetime. This approach can also be used for other physical quantities, such as photodarkening, stress relaxation, and luminescence decay, provided that it can be described by a distribution function.

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Section: Narrow and Steep Distribution Functionmentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Kinetics of Thermally Activated Physical Processes in Disordered Media

Poumellec

Lancry²

2015

Fibers

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“…with a distance range comparable to other distributed fibre sensing techniques and with the possibility to still get a comfortable reflection signal. The challenge is now to find a solution to produce extremely long, ideally uniform, FBG showing a very low reflectivity and some recent results demonstrate possible approaches 5 .…”

Section: Description and Principlementioning

confidence: 99%

Novel technique for distributed fibre sensing based on faint long gratings (FLOGs)

et al. 2014

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A novel approach for fibre distributed sensing is proposed, conceived to match as closely as possible to an ideally responding distributed sensor. It is demonstrated that it can be actually realized using fibre Bragg gratings of extremely low index contrast and continuously printed over the entire fibre length. The concept is experimentally validated over a restricted distance range that proves the huge potentialities of the technique in terms of response and precision.

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“…with a distance range comparable to other distributed fiber sensing techniques and with the possibility to still get a comfortable reflection signal. The challenge is now to find a technique to produce extremely long, ideally uniform, FBG showing a very low reflectivity and some recent results demonstrate possible approaches [15]. Note that the 10 cm weak FBG used to make the experimental demonstration already presented a reflectivity in excess of the safe 20%.…”

Section: Experimental Setup For Sensing Applicationsmentioning

confidence: 99%

Time-frequency analysis of long fiber Bragg gratings with low reflectivity

Sancho¹,

Chin²,

Barrera³

et al. 2013

Opt. Express

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Abstract:A new technique to investigate the spatial distribution of the reflection spectrum along fabricated long weak fiber Bragg gratings (FBG) is experimentally demonstrated, together with its potential applications for distributed fiber sensing and broadband signal processing. A short pulsed coherent light signal is launched into a FBG and the signal frequency is scanned through the FBG reflection spectrum. When the pulse duration is set much shorter than the transit time through the grating a time-resolved reflected signal can be obtained for each signal frequency. It informs about the distribution of the refractive index periodic perturbation along the entire FBG length, hence the uniformity or frequency chirp information of the fabricated FBG. This technique has been implemented to demonstrate a distributed temperature sensing system with high spatial resolution and to also realize a robust all-fiber tunable delay line for broadband signals.

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UV laser processing and multiphoton absorption processes in optical telecommunication fiber materials

Cited by 53 publications

References 156 publications

Kinetics of Thermally Activated Physical Processes in Disordered Media

Kinetics of Thermally Activated Physical Processes in Disordered Media

Novel technique for distributed fibre sensing based on faint long gratings (FLOGs)

Time-frequency analysis of long fiber Bragg gratings with low reflectivity

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