In this paper, we have briefly review the developing history and recent advances made with
regard to helical long-period fiber gratings (HLPGs) in three aspects, ie, the mode-coupling …

In this paper, comprehensive remarks are given that focus on the main fabrications and wide
applications of helical long-period fiber gratings (HLPGs). Firstly, the techniques of …

We demonstrated the fabrication of bandwidth tunable ultra-broadband mode converters
based on CO_2-laser inscribed long-period fiber gratings (LPFGs) and helical long-period …

A broadband tunable orbital angular momentum (OAM) mode converter based on a helical
long-period fiber grating (HLPFG) inscribed in a conventional single-mode fiber (SMF) is …

In this study, a broadband flat-top second-order orbital angular momentum mode (OAM)
converter is proposed and demonstrated using a phase-modulated second-order helical …

A novel method to control the parameters of a chiral fiber grating structure is proposed.
Mode couplings are controlled in real time during the twisting fabrication process. This chiral …

A wave-band-tunable optical fiber broadband orbital angular momentum (OAM) mode
converter based on a helical long-period fiber grating (HLPFG) and dispersion turning point …

An ultra-wideband orbital-angular-momentum (OAM) mode generator has been proposed
and demonstrated both theoretically and experimentally, which is based on a helical long …

In this study, an ultra-broadband orbital angular momentum (OAM) mode generator based
on a phase-modulated helical long period fiber grating (HLPG) working at highradial order …

A new method enabling to provide an on-demand flat-top wideband orbital angular
momentum (OAM) mode converter is proposed and experimentally demonstrated, which is …