研究目的
To demonstrate a simple, compact, and cost-effective all-fiber structure for generating first-order orbital angular momentum (OAM) modes over a broad wavelength range using offset splicing and fiber rotating technology.
研究成果
The proposed method successfully generates linearly polarized OAM ±1,1 modes in a broadband wavelength range (1530–1566 nm) using offset splicing and fiber rotating technology. It offers advantages of simplicity, cost-effectiveness, and reduced system complexity by omitting components like polarization controllers. This has potential applications in all-fiber vortex lasers and sensing systems.
研究不足
The method relies on precise offset splicing and fiber rotation, which may require careful fabrication and alignment. The use of PM fibers limits flexibility in polarization handling, and the system's performance might be sensitive to environmental factors like temperature and mechanical stress.
1：Experimental Design and Method Selection:
The experiment uses offset splicing between a polarization-maintaining single-mode fiber (PM-SMF) and a two-mode fiber (TMF) to excite LP11 mode in TMF from LP01 mode in SMF. A customized fiber rotator is used to modulate the phase difference between degenerate LP11 modes to generate OAM modes. Beam propagation method (BPM) simulation is employed to analyze mode coupling efficiency.
2：Sample Selection and Data Sources:
A TMF and PM-SMF are used, with offset splicing distances varied from 10 μm to 20 μm. Light from a tunable laser source is used across wavelengths from 1530 nm to 1566 nm.
3：List of Experimental Equipment and Materials:
Includes a laser light source (TWL-CL-R, Optilab), PM fiber coupler, PM-SMFs, TMF, non-polarizing beam splitter (NPBS), infrared CCD camera, tunable light attenuator, polarizer, and fusion splicer for offset splicing.
4：Experimental Procedures and Operational Workflow:
Polarized light is split by a PM fiber coupler; one path goes through the offset-spliced SMF-TMF structure and fiber rotator to generate OAM modes, while the other path provides a Gaussian reference beam. The beams are combined using NPBS, and interference patterns are captured with a CCD camera to verify OAM generation. The fiber rotator is adjusted to achieve ±π/2 phase difference.
5：Data Analysis Methods:
Interference patterns (fork-shape or spiral) are analyzed to confirm OAM modes. Mode purity and coupling efficiency are assessed based on simulation and experimental intensity patterns.
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Laser Light Source
TWL-CL-R
Optilab
Provides polarized light with a narrow line width for the experiment.
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PM Fiber Coupler
Splits the light into two paths while maintaining polarization.
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PM-SMF
Used for input and reference beams to maintain polarization and avoid mode coupling.
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TMF
Supports LP01 and LP11 modes for generating OAM modes.
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Non-Polarizing Beam Splitter
NPBS
Combines the OAM and Gaussian beams for interference.
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CCD Camera
Captures interference patterns to verify OAM generation.
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Tunable Light Attenuator
Adjusts the power of the Gaussian beam for fine interference.
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Polarizer
Used for polarization measurements of the interference patterns.
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Fusion Splicer
Used for automatic fusion splicing to create offset-spliced structures.
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Fiber Rotator
Customized
Modulates the phase difference between LP11 modes to generate OAM modes.
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