Full C- and L-band covered second-order OAM mode generator based on a thinned helical long-period fiber grating.
Opt Express
; 32(11): 18717-18726, 2024 May 20.
Article
em En
| MEDLINE
| ID: mdl-38859021
ABSTRACT
A full C- and L-band covered second-order orbital-angular-momentum (OAM) mode generator has been proposed and experimentally demonstrated, which is realized by using a helical long-period fiber grating (HLPG) but inscribed in a thinned four-mode fiber. By optimizing the design of grating period and fiber diameter of the proposed HLPG, an ultra-broadband rejection filter with a depth of â¼23â
dB, a bandwidth of â¼156â
nm @-10â
dB (ranging from 1522â
nm to 1678â
nm) and a bandwidth of â¼58â
nm @-20â
dB (ranging from 1574â
nm to 1632â
nm), has been successfully obtained as a typical sample. To the best of our knowledge, this is the first demonstration of such ultra-broadband second-order OAM mode generator by using only one fiber component, i.e., the thinned HLPG. In addition, the proposed generator is less polarization-dependent and less temperature-sensitive than those of the conventional HLPGs, which is believed to be considerably helpful to find potential applications of the device itself in wavelength division multiplexing (WDM) and OAM mode division multiplexing (MDM) optical fiber communication systems.
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article