%0 Generic %1 granger2016first %A Granger, Geoffroy %A Röhrer, Christian %A Kleem, Götz %A Zeitvogel, Christine %A Voß, Andreas %A Graf, Thomas %A Abdou Ahmed, Marwan %B Photonics Europe %D 2016 %K FiberBeamdelivery myown %T First fabrication of optical Bragg fibers by a single-step powder in tube process based on the SiO2-Al2O3 system %X This paper presents a study of an innovative fabrication process corresponding to 1D photonic bandgap Bragg fibers (BF) and their characterization. The multiple "rod in tube" and "powder in tube" (PIT) technique based on an SiO2-Al2O3 system is used. The chemical properties are analyzed by an X-ray spectrometry (EDX). The optical properties, here refractive index contrast (RIC) and waveguide behavior of the drawn fibers, are studied according to the fiber design and the simulations. A comparative study between a drawn step index fiber (SIF) and a four-ring BF, both produced with PIT, shows a large dilution of the initially pure alumina part into silica from 55% weight of alumina in the SIF core until 10% in the BF rings. This phenomenon leads to a RIC decrease from 0.11 to 0.01 respectively. After process optimization, we get more than one hundred meters of four-ring BF with core diameter equal to 25 µm. This fiber shows as predicted a singlemode behavior over the whole fundamental transmission band (850 – 1400 nm), M² = 1.07 at 1064 nm. The attenuation is measured to be close to 0.06 dB/m at 1064 nm which is very promising according to the first proof of concept. The additional bending losses are measured to be 0.1 dB/m for an 8 cm bending diameter, M² = 1.17. A second Bragg fiber based on an 60 µm core diameter with a two-ring design demonstrated a singlemode behavior at 1950 nm as predicted by the simulations. The shift of the fundamental transmission band results into a larger alumina filled gap. This leads to the band gap positioning close to 1.1 µm. This phenomenon is moreover argued with the LP3x and LP2x high index ring mode coupling observation in the visible and infrared range respectively.

@presentation{granger2016first, abstract = {This paper presents a study of an innovative fabrication process corresponding to 1D photonic bandgap Bragg fibers (BF) and their characterization. The multiple "rod in tube" and "powder in tube" (PIT) technique based on an SiO2-Al2O3 system is used. The chemical properties are analyzed by an X-ray spectrometry (EDX). The optical properties, here refractive index contrast (RIC) and waveguide behavior of the drawn fibers, are studied according to the fiber design and the simulations. A comparative study between a drawn step index fiber (SIF) and a four-ring BF, both produced with PIT, shows a large dilution of the initially pure alumina part into silica from 55% weight of alumina in the SIF core until 10% in the BF rings. This phenomenon leads to a RIC decrease from 0.11 to 0.01 respectively. After process optimization, we get more than one hundred meters of four-ring BF with core diameter equal to 25 µm. This fiber shows as predicted a singlemode behavior over the whole fundamental transmission band (850 – 1400 nm), M² = 1.07 at 1064 nm. The attenuation is measured to be close to 0.06 dB/m at 1064 nm which is very promising according to the first proof of concept. The additional bending losses are measured to be 0.1 dB/m for an 8 cm bending diameter, M² = 1.17. A second Bragg fiber based on an 60 µm core diameter with a two-ring design demonstrated a singlemode behavior at 1950 nm as predicted by the simulations. The shift of the fundamental transmission band results into a larger alumina filled gap. This leads to the band gap positioning close to 1.1 µm. This phenomenon is moreover argued with the LP3x and LP2x high index ring mode coupling observation in the visible and infrared range respectively.}, added-at = {2018-04-20T12:22:53.000+0200}, author = {Granger, Geoffroy and R{\"o}hrer, Christian and Kleem, G{\"o}tz and Zeitvogel, Christine and Voß, Andreas and Graf, Thomas and Abdou Ahmed, Marwan}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/27d8f8c64a388b9cd0c36c006fecd6c36/thomas_graf}, booktitle = {Photonics Europe}, eventdate = {3.-7. April 2016}, interhash = {e40dd3376ca0faa5e8f5b533279ba98c}, intrahash = {7d8f8c64a388b9cd0c36c006fecd6c36}, keywords = {FiberBeamdelivery myown}, organization = {SPIE}, timestamp = {2018-04-20T10:22:57.000+0200}, title = {First fabrication of optical Bragg fibers by a single-step powder in tube process based on the SiO2-Al2O3 system}, year = 2016 }