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A new type of long-period fiber grating is proposed and demonstrated. The structure of the device consists of a few micro air-channels along a single-mode fiber, and is fabricated by using a
A novel phase-only modulated method allowing generation of multichannel orbital angular momentum (OAM) based on helical long-period fiber grating (HLPG) has been proposed. Thanks to the method
We demonstrate an ultra-broadband multi-channel orbital angular momentum (OAM) mode generator using a helical long-period grating (HLPG) pair in a few-mode fiber. The numbers of
We demonstrate a broadband multi-channel OAM mode converter implemented with a Mach-Zehnder interferometer (MZI) mode coupler based on seven-core fiber helical long-period
This paper presents a review of the evolution of LPFGs, with a specific focus on the progression and current trends of mechanically induced long
A simple and efficient sampling approach enabling fabrication of a multichannel long-period fiber grating (LPG) was proposed and demonstrated for the first time both theoretically and experimentally. Unlike
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 fabricating
We theoretically demonstrate a long-period grating (LPG) based single-mode fiber to multi-core fiber coupler. The coupling efficiency achieved was 24% of the input power, evenly distributed
Long-period fiber gratings (LPFGs) functioning as band-reject filters have played a pivotal role in the realm of optical communication. Since their initial
Instead of inscribing the discrete phases into each local period of the seed HLPG, an equivalent approach to realize the phase-only sampled multichannel helical long-period fiber grating (HLPG)
Long-period fiber gratings (LPFGs), as high-performance all-fiber passive devices, have sparked widespread attention due to their low insertion loss, compact construction, and excellent
Mentioning: 6 - The Superimposed Multi-Channel Helical Long-Period Fiber Grating and Its Application to Multi-Channel OAM Mode Generator - Mizushima, Ryo, Detani, Taishu, Zhu, Chengliang, Wang,
In this work, we propose and demonstrate a dual-pitch staggered long-period fiber grating (DSP-LPFG) capable of facilitating mode conversion between two distinct mode pairs.
A novel DC-sampling method allowing generation of a multichannel helical long-period fiber grating (HLPG) has been proposed. Unlike the previous phase-only sampling method where
Optimal design and fabrication of multichannel helical long-period fiber gratings based on phase-only sampling method.
Bragg gratings are reflecting structures with a periodic refractive index modulation. They are contained in dielectric mirrors and in some fiber devices.
Femtosecond laser direct writing annular small-period long-period fiber gratings for simultaneous refractive index and temperature sensing
We propose and demonstrate the inscription of parallel long-period gratings (LPGs) in a few-mode fiber (FMF) using femtosecond lasers. Mode