In recent years, vortex beams with orbital angular momentum (OAM) have attracted more
and more attention. The wavefront of the OAM beams is helical, the intensity at the center of …

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 …

There are great challenges in the generation of higher-order modes for long period fiber
grating (LPFG). The cross-coupling coefficient between the fundamental mode and the …

We propose and demonstrate the inscription of parallel long-period gratings (LPGs) in a few-
mode fiber (FMF) using femtosecond lasers. Mode conversion from the fundamental (LP_01) …

摘要随着光通信网络的发展, 高性能宽带模式转换器成为了迫切需求. 提出并实验制备了强调制
相移少模光纤螺旋长周期光栅, 其可以实现全光纤宽带轨道角动量模式转换器的功能 …

All-fiber mode converters for generating orbital angular momentum (OAM) beams have
many applications in optical communications, optical sensing and lasers. Currently, it is a …

We propose and demonstrate the fabrication of an all-fiber mode converter enabling
simultaneous generation of multiple high-order core modes, which is realized by inscribing a …

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 …

In this study, an all-fiber±3-order orbital angular momentum (OAM) mode generator with∼
90% conversion efficiency is proposed and experimentally demonstrated. By using a helical …

The orbital angular momentum (OAM) of light provides a new degree of freedom for carrying
information. The stable propagation and generation of OAM modes are necessary for the …