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Titolo:
Asymmetric transmission spectrum of a long-period fiber grating and its removal using a beam scanning method
Autore:
Eom, TJ; Kim, YJ; Chung, YJ; Han, WT; Paek, UC; Lee, BH;
Indirizzi:
Kwangju Inst Sci & Technol, Dept Informat & Commun, Kwangju 500712, South Korea Kwangju Inst Sci & Technol Kwangju South Korea 500712 00712, South Korea
Titolo Testata:
IEICE TRANSACTIONS ON ELECTRONICS
fascicolo: 5, volume: E84C, anno: 2001,
pagine: 615 - 620
SICI:
0916-8524(200105)E84C:5<615:ATSOAL>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SENSORS;
Keywords:
fiber grating; long-period fiber grating; chirped grating; band-rejection filter; WDM communication system;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Eom, TJ Kwangju Inst Sci & Technol, Dept Informat & Commun, 1 Oryong Dong,Kwangju500712, South Korea Kwangju Inst Sci & Technol 1 Oryong Dong Kwangju South Korea 500712
Citazione:
T.J. Eom et al., "Asymmetric transmission spectrum of a long-period fiber grating and its removal using a beam scanning method", IEICE TR EL, E84C(5), 2001, pp. 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 ofside 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 effectin the long-period fiber grating. The nonuniform 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 thecore 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 theasymmetric problem and recover the typical spectrum of the linearly chirped fiber grating.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 14:47:49