Tunable Orbital Angular Momentum Generation Based on Two Orthogonal LP Modes in Optical Fibers

Jiang, Youchao; Li, Haisu; Tang, Min; Jin, Wenxing; Jian, Wei; Jian, Shuisheng

doi:10.1109/lpt.2017.2693680

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…Therefore, the final output of the RCF is a linear polarization (LP) mode [17]. Finally, the linearly polarized OAM modes in the RCF can be generated by combining degenerated LP odd 11 and LP even 11 modes with a ±π/2 phase shift [18].…”

Section: B Numerical Simulation Of Modes In the Rcfmentioning

confidence: 99%

Using Mechanically-Induced Long-Period Fiber Gratings for OAM Modes Generation Based on Anti-Resonant Mechanisms in Ring-Core Fibers

et al. 2022

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A flexible first-order OAM modes generation in ringcore fibers (RCFs) based on a mechanically-induced long-period fiber grating (MLPFG) is proposed. By directly fusion splicing a standard single-mode fiber (SMF) and RCFs, the anti-resonant reflection guidance mechanism (ARRGM) is introduced in the RCF, leading to the guided-core modes, so-called anti-resonant modes (AR modes), which have a Gaussian field distribution and are confined in low-refractive index central core of RCFs. A mechanical long-period fiber grating is used to couple the AR modes into the OAM modes propagated in the high-index ring core of the RCF. Results show that the generated OAM modes are the combination of two orthogonal linearly polarized (LP) modes with ±π/2 phase shift in the ring core. The mode conversion efficiency of OAM+1 and OAM-1 can reach 95% and 94%, respectively, indicating promising applications in sensing and communication of the RCFs.

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Section: B Numerical Simulation Of Modes In the Rcfmentioning

confidence: 99%

Using Mechanically-Induced Long-Period Fiber Gratings for OAM Modes Generation Based on Anti-Resonant Mechanisms in Ring-Core Fibers

et al. 2022

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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%

“…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%

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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“…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]. In addition, the LP11a and LP11b can be generated by respectively injecting two LP01 modes with slight horizontal and vertical displacement from the fiber axis and the relative phase can be controlled by using a piezo-driven delay stage [26,27,66]. The second type, the tunable OAM modes can be achieved by filtering the mixing modes which are produced by the combination of different vector modes or two spatially orthogonal LP modes owning orthogonal polarization directions with a ±π/2 phase shift.…”

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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Tunable Orbital Angular Momentum Generation Based on Two Orthogonal LP Modes in Optical Fibers

Cited by 13 publications

References 19 publications

Using Mechanically-Induced Long-Period Fiber Gratings for OAM Modes Generation Based on Anti-Resonant Mechanisms in Ring-Core Fibers

Using Mechanically-Induced Long-Period Fiber Gratings for OAM Modes Generation Based on Anti-Resonant Mechanisms in Ring-Core Fibers

Generation of Orbital Angular Momentum Modes Using Fiber Systems

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

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