The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Dans un réseau de fibres idéal ayant une modulation d'indice de réfraction uniforme, le spectre de réflexion ou de transmission est symétrique avec une quantité égale de lobes latéraux des deux côtés de la longueur d'onde de résonance du réseau de fibres. On observe qu'un réseau de fibres à longue période réalisé par un faisceau laser UV non uniforme à travers un masque d'amplitude uniforme présente un spectre de transmission asymétrique. La caractéristique asymétrique s'explique par l'effet Mach-Zehnder dans le réseau à fibres longue période. Le faisceau laser UV non uniforme provoque également une modulation d'indice non uniforme le long du cœur de la fibre. Par conséquent, un faisceau couplé à un mode gainage au niveau d’une section du réseau peut être recouplé au mode noyau après avoir parcouru une certaine distance. Le faisceau recouplé crée une interférence de type Mach-Zehnder avec le mode noyau non couplé. Cependant, il est présenté que le phénomène asymétrique peut être surmonté en balayant le faisceau laser UV le long de la fibre au-dessus du masque. La méthode de balayage du faisceau est capable de subir la même fluence du faisceau laser UV sur la fibre. Enfin, un réseau de fibres longue période à fréquence linéaire a été réalisé à l’aide du faisceau laser UV non uniforme. En raison de l’asymétrie, l’effet gazouillant n’a pas été clairement observé. Il est également présenté que la méthode de balayage du faisceau pourrait éliminer le problème asymétrique et récupérer le spectre typique du réseau de fibres à fréquence linéaire.
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Copier
Tae-Jung EOM, Young-Jae KIM, Youngjoo CHUNG, Won-Taek HAN, Un-Chul PAEK, Byeong Ha LEE, "Asymmetric Transmission Spectrum of a Long-Period Fiber Grating and Its Removal Using a Beam Scanning Method" in IEICE TRANSACTIONS on Electronics,
vol. E84-C, no. 5, pp. 615-620, May 2001, doi: .
Abstract: In an ideal fiber grating having a uniform refractive index modulation, the reflection or the transmission spectrum is symmetric with equal amount of side lobes on both sides of the resonant wavelength of the fiber grating. It is observed that a long-period fiber grating made by a non-uniform UV laser beam through a uniform amplitude mask has an asymmetric transmission spectrum. The asymmetric characteristic is explained with Mach-Zehnder effect in the long-period fiber grating. The non-uniform UV laser beam makes also a non-uniform index modulation along the fiber core. Therefore, a beam coupled to a cladding mode at a section of the grating can be re-coupled to the core mode after passing a certain distance. The re-coupled beam makes Mach-Zehnder-like interference with the un-coupled core mode. However, it is presented that the asymmetric phenomenon can be overcome by scanning the UV laser beam along the fiber over the mask. The beam scanning method is able to suffer the same fluence of the UV laser beam on the fiber. Finally, a linearly chirped long-period fiber grating was made using the non-uniform UV laser beam. Due to the asymmetricity the chirping effect was not clearly observed. It is also presented that the beam scanning method could remove the asymmetric problem and recover the typical spectrum of the linearly chirped fiber grating.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e84-c_5_615/_p
Copier
@ARTICLE{e84-c_5_615,
author={Tae-Jung EOM, Young-Jae KIM, Youngjoo CHUNG, Won-Taek HAN, Un-Chul PAEK, Byeong Ha LEE, },
journal={IEICE TRANSACTIONS on Electronics},
title={Asymmetric Transmission Spectrum of a Long-Period Fiber Grating and Its Removal Using a Beam Scanning Method},
year={2001},
volume={E84-C},
number={5},
pages={615-620},
abstract={In an ideal fiber grating having a uniform refractive index modulation, the reflection or the transmission spectrum is symmetric with equal amount of side lobes on both sides of the resonant wavelength of the fiber grating. It is observed that a long-period fiber grating made by a non-uniform UV laser beam through a uniform amplitude mask has an asymmetric transmission spectrum. The asymmetric characteristic is explained with Mach-Zehnder effect in the long-period fiber grating. The non-uniform UV laser beam makes also a non-uniform index modulation along the fiber core. Therefore, a beam coupled to a cladding mode at a section of the grating can be re-coupled to the core mode after passing a certain distance. The re-coupled beam makes Mach-Zehnder-like interference with the un-coupled core mode. However, it is presented that the asymmetric phenomenon can be overcome by scanning the UV laser beam along the fiber over the mask. The beam scanning method is able to suffer the same fluence of the UV laser beam on the fiber. Finally, a linearly chirped long-period fiber grating was made using the non-uniform UV laser beam. Due to the asymmetricity the chirping effect was not clearly observed. It is also presented that the beam scanning method could remove the asymmetric problem and recover the typical spectrum of the linearly chirped fiber grating.},
keywords={},
doi={},
ISSN={},
month={May},}
Copier
TY - JOUR
TI - Asymmetric Transmission Spectrum of a Long-Period Fiber Grating and Its Removal Using a Beam Scanning Method
T2 - IEICE TRANSACTIONS on Electronics
SP - 615
EP - 620
AU - Tae-Jung EOM
AU - Young-Jae KIM
AU - Youngjoo CHUNG
AU - Won-Taek HAN
AU - Un-Chul PAEK
AU - Byeong Ha LEE
PY - 2001
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E84-C
IS - 5
JA - IEICE TRANSACTIONS on Electronics
Y1 - May 2001
AB - In an ideal fiber grating having a uniform refractive index modulation, the reflection or the transmission spectrum is symmetric with equal amount of side lobes on both sides of the resonant wavelength of the fiber grating. It is observed that a long-period fiber grating made by a non-uniform UV laser beam through a uniform amplitude mask has an asymmetric transmission spectrum. The asymmetric characteristic is explained with Mach-Zehnder effect in the long-period fiber grating. The non-uniform UV laser beam makes also a non-uniform index modulation along the fiber core. Therefore, a beam coupled to a cladding mode at a section of the grating can be re-coupled to the core mode after passing a certain distance. The re-coupled beam makes Mach-Zehnder-like interference with the un-coupled core mode. However, it is presented that the asymmetric phenomenon can be overcome by scanning the UV laser beam along the fiber over the mask. The beam scanning method is able to suffer the same fluence of the UV laser beam on the fiber. Finally, a linearly chirped long-period fiber grating was made using the non-uniform UV laser beam. Due to the asymmetricity the chirping effect was not clearly observed. It is also presented that the beam scanning method could remove the asymmetric problem and recover the typical spectrum of the linearly chirped fiber grating.
ER -