Standard

Understanding the influence of the structured cladding on the reflectivity of femtosecond laser written gratings in photonic crystal fibers. / Baghdasaryan, Tigran; Geernaert, Thomas; Thienpont, Hugo; Berghmans, Francis.

18th International Conference on Transparent Optical Networks (ICTON) . IEEE, 2016. p. 1-5.

Research output: Chapter in Book/Report/Conference proceedingConference paper

Harvard

Baghdasaryan, T, Geernaert, T, Thienpont, H & Berghmans, F 2016, Understanding the influence of the structured cladding on the reflectivity of femtosecond laser written gratings in photonic crystal fibers. in 18th International Conference on Transparent Optical Networks (ICTON) . IEEE, pp. 1-5, 18th International Conference on Transparent Optical Networks (ICTON) , Trento, Italy, 10/07/16.

APA

Vancouver

Author

BibTeX

@inproceedings{bf284313a65e4a13b3e88b72bd11041e,
title = "Understanding the influence of the structured cladding on the reflectivity of femtosecond laser written gratings in photonic crystal fibers",
abstract = "Fiber Bragg gratings have been essential elements in fiber optical communication for more than two decades. Although writing gratings using different inscription methods in step-index fibers has become a standard procedure, femtosecond laser based fabrication of such gratings in specialty fibers such as photonic crystal fibers (PCFs) has proven not to be straightforward. This is due to the presence of air holes in the cladding region, which impede sufficient amounts of optical energy to reach the core region. An important consequence of the presence of air holes in the cladding, which is sometimes disregarded, is the non-uniform distribution of the laser intensity in the core region, which results in an equally non-uniform refractive index change in the PCF core cross-section. To study this issue we have built a dedicated model based on coupled mode theory that allows estimating the reflectivity of the grating by modeling the intensity distribution in the PCF core region and the resulting non-linear refractive index change using empirical data. We clearly see that the limited overlap of the fiber mode with the index change reduces the reflectivity of the grating, and that the extent of this effect depends on the angular orientation of the PCF with respect to the direction of the inscription beam and on the laser beam focusing optics.",
keywords = "MICROSTRUCTURED OPTICAL-FIBERS, BRAGG GRATINGS, IR GRATINGS, INSCRIPTION, RADIATION, SILICA",
author = "Tigran Baghdasaryan and Thomas Geernaert and Hugo Thienpont and Francis Berghmans",
year = "2016",
language = "English",
isbn = "978-1-5090-1467-5",
pages = "1--5",
booktitle = "18th International Conference on Transparent Optical Networks (ICTON)",
publisher = "IEEE",

}

RIS

TY - GEN

T1 - Understanding the influence of the structured cladding on the reflectivity of femtosecond laser written gratings in photonic crystal fibers

AU - Baghdasaryan, Tigran

AU - Geernaert, Thomas

AU - Thienpont, Hugo

AU - Berghmans, Francis

PY - 2016

Y1 - 2016

N2 - Fiber Bragg gratings have been essential elements in fiber optical communication for more than two decades. Although writing gratings using different inscription methods in step-index fibers has become a standard procedure, femtosecond laser based fabrication of such gratings in specialty fibers such as photonic crystal fibers (PCFs) has proven not to be straightforward. This is due to the presence of air holes in the cladding region, which impede sufficient amounts of optical energy to reach the core region. An important consequence of the presence of air holes in the cladding, which is sometimes disregarded, is the non-uniform distribution of the laser intensity in the core region, which results in an equally non-uniform refractive index change in the PCF core cross-section. To study this issue we have built a dedicated model based on coupled mode theory that allows estimating the reflectivity of the grating by modeling the intensity distribution in the PCF core region and the resulting non-linear refractive index change using empirical data. We clearly see that the limited overlap of the fiber mode with the index change reduces the reflectivity of the grating, and that the extent of this effect depends on the angular orientation of the PCF with respect to the direction of the inscription beam and on the laser beam focusing optics.

AB - Fiber Bragg gratings have been essential elements in fiber optical communication for more than two decades. Although writing gratings using different inscription methods in step-index fibers has become a standard procedure, femtosecond laser based fabrication of such gratings in specialty fibers such as photonic crystal fibers (PCFs) has proven not to be straightforward. This is due to the presence of air holes in the cladding region, which impede sufficient amounts of optical energy to reach the core region. An important consequence of the presence of air holes in the cladding, which is sometimes disregarded, is the non-uniform distribution of the laser intensity in the core region, which results in an equally non-uniform refractive index change in the PCF core cross-section. To study this issue we have built a dedicated model based on coupled mode theory that allows estimating the reflectivity of the grating by modeling the intensity distribution in the PCF core region and the resulting non-linear refractive index change using empirical data. We clearly see that the limited overlap of the fiber mode with the index change reduces the reflectivity of the grating, and that the extent of this effect depends on the angular orientation of the PCF with respect to the direction of the inscription beam and on the laser beam focusing optics.

KW - MICROSTRUCTURED OPTICAL-FIBERS

KW - BRAGG GRATINGS

KW - IR GRATINGS

KW - INSCRIPTION

KW - RADIATION

KW - SILICA

M3 - Conference paper

SN - 978-1-5090-1467-5

SP - 1

EP - 5

BT - 18th International Conference on Transparent Optical Networks (ICTON)

PB - IEEE

ER -

ID: 29134668