Two-dimensional tunable orbital angular momentum generation using a vortex fiber

Jiang, Youchao; Shen, Y.F.; Xu, Yao; Jin, Wenxing; Wu, Yue; Jian, Wei; Jian, Shuisheng

doi:10.1364/ol.42.005014

Cited by 32 publications

(12 citation statements)

References 21 publications

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“…The mode couple module is used to couple the fundamental mode to a specific lth-order CV mode. It is usually composed of the fiber gratings [31][32][33][34][35][36][37][38][39][40][41][42][43][44] and the fiber couplers [45][46][47][48]. As mentioned above, the lth-order CV modes are composed of four degenerated modes.…”

Section: Generation Of Oam Beamsmentioning

confidence: 99%

“…The fabrication of MSC, composed of SMF and the FMF/MMF is easier than the MSC composed of SMF and RCF, while the later MSC is more compatible to the OAM mode transmission system than the MSC composed of FMF/MMF. There have been many works to generate OAM mode based on the two types of MSCs [45][46][47][48]. The experimental setup usually used to generate the OAM mode based on the MSC is shown in Figure 11a The MSC is used to couple the fundamental mode to the higher order CV mode group, and the polarization controllers are used to redistribute the generated random state of lth-order CV modes to the OAM modes we want to obtain.…”

Section: Mode Selective Coupler (Msc)-based Oam Generation Systemsmentioning

confidence: 99%

“…Compared with spatial generating methods, fiber generating methods have shown their certain advantages. A converter applied in fiber methods can be fiber gratings [31][32][33][34][35][36][37][38][39][40][41][42][43][44], mode selective couplers [45][46][47][48], and microstructure optical fibers [49][50][51] and photonic lanterns [52,53]. As a cylindrical waveguide, fiber is a natural beam shaper for OAM beams.…”

Section: Introductionmentioning

confidence: 99%

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Generation of Orbital Angular Momentum Modes Using Fiber Systems

et al. 2019

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Orbital angular momentum (OAM) beams, characterized by the helical phase wavefront, have received significant interest in various areas of study. There are many methods to generate OAM beams, which can be roughly divided into two types: spatial methods and fiber methods. As a natural shaper of OAM beams, the fibers exhibit unique merits, namely, miniaturization and a low insertion loss. In this paper, we review the recent advances in fiber OAM mode generation systems, in both the interior and exterior of the beams. We introduce the basic concepts of fiber modes and the generation and detection theories of OAM modes. In addition, fiber systems based on different nuclear devices are introduced, including the long-period fiber grating, the mode-selective coupler, microstructural optical fiber, and the photonic lantern. Finally, the key challenges and prospects for fiber OAM mode systems are discussed.

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Section: Generation Of Oam Beamsmentioning

confidence: 99%

Section: Mode Selective Coupler (Msc)-based Oam Generation Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Generation of Orbital Angular Momentum Modes Using Fiber Systems

et al. 2019

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“…The ∆neff represents the RI difference between two modes and λ represents the operating wavelength. Thus, in order to achieve flexible control of the relative phase between the two modes in the fiber, changing the operating wavelength λ [61,62] and the refractive index difference ∆neff are two commonly used methods. So far, ways of controlling ∆neff mainly depend on adjusting the pressure loaded on the fiber and rotating the paddles of few-mode polarization controller [63][64][65].…”

Section: The Fiber-based Generation Of Tunable Oammentioning

confidence: 99%

“…The phase shift can be obtained in the same ways as mentioned above. Then, the continually tunable OAM can be achieved by adjusting direction of the polarizer at the output of the FMF [62,63,66,67]. The specific process is shown in Figure 11 and the "p" is the angle between the direction of the polarizer and the positive direction of the x-axis.…”

Section: The Fiber-based Generation Of Tunable Oammentioning

confidence: 99%

A Review of Tunable Orbital Angular Momentum Modes in Fiber: Principle and Generation

Feng

et al. 2019

Applied Sciences

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Orbital angular momentum (OAM) beams, a new fundamental degree of freedom, have excited a great diversity of interest due to a variety of emerging applications. The scalability of OAM has always been a topic of discussion because it plays an important role in many applications, such as expanding to large capacity and adjusting the trapped particle rotation speed. Thus, the generation of arbitrary tunable OAM mode has been paid increasing attention. In this paper, the basic concepts of classical OAM modes are introduced firstly. Then, the tunable OAM modes are categorized into three types according to the orbital angular momentums and polarization states of mode carrying. In order to understand the OAM evolution of a mode intuitively, three kinds of Poincaré spheres (PSs) are introduced to represent the three kinds of tunable OAM modes. Numerous methods generating tunable OAM modes can be roughly divided into two types: spatial and fiber-based generation methods. The principles of fiber-based generation methods are interpreted by introducing two mode bases (linearly-polarized modes and vector modes) of the fiber. Finally, the strengths and weaknesses of each generation method are pointed out and the key challenges for tunable OAM modes are discussed.

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Broadband Mode Division Multiplexing of OAM‐Modes by a Micro Printed Waveguide Structure

Schulz,

von Freymann

2024

Advanced Optical Materials

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A light beam carrying orbital angular momentum (OAM) is characterized by a helical phase‐front that winds around the center of the beam. These beams have unique properties that have found numerous applications. In the field of data transmission, they represent a degree of freedom that could potentially increase capacity. While an efficient method for (de)composing beams based on their OAM exists for free‐space optics, a device capable of performing this (de)composition in an integrated, compact fiber application without the use of external active optical elements and for multiple OAM modes and multiple wavelengths simultaneously has not been reported. In this study, two mechanisms are combined in a waveguide structure to demonstrate as a proof of principle that this can serve as a broadband fiber OAM (de)multiplexer. The structure design is based on the adiabatic principle used in photonic lanterns for highly efficient conversion of spatially separated single modes into eigenmodes of a few‐mode fiber. In addition, an artificial magnetic field is introduced by twisting the structure, which removes the degeneracy between modes having the same absolute OAM. This structure could simplify, stabilize, and miniaturize the creation or decomposition of OAM beams, making them useful for various applications.

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Two-dimensional tunable orbital angular momentum generation using a vortex fiber

Cited by 32 publications

References 21 publications

Generation of Orbital Angular Momentum Modes Using Fiber Systems

Generation of Orbital Angular Momentum Modes Using Fiber Systems

A Review of Tunable Orbital Angular Momentum Modes in Fiber: Principle and Generation

Broadband Mode Division Multiplexing of OAM‐Modes by a Micro Printed Waveguide Structure

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