研究目的
To demonstrate the fabrication of all-chalcogenide single-mode fiber couplers compatible with the mid-infrared range, capable of serving as wavelength demultiplexers and polarizing beamsplitters.
研究成果
The fabricated all-chalcogenide single-mode fiber couplers exhibit high coupling extinction ratios, strong wavelength-dependence, and the ability to separate orthogonally polarized components, making them suitable as building blocks for mid-infrared optical systems.
研究不足
The study is focused on the mid-infrared range and specific materials (As2Se3 fibers), which may limit applicability to other wavelengths or materials. The fabrication process requires precise control of temperature and stretching.
1：Experimental Design and Method Selection:
The couplers are fabricated using a mastered heat-brush technique with a pre-defined transition profile to ensure single-mode operation and adiabaticity.
2：Sample Selection and Data Sources:
Two identical pieces of single-mode As2Se3 fibers are used, provided by CorActive High-tech.
3：List of Experimental Equipment and Materials:
As2Se3 fibers with specific numerical aperture and diameters, SMF-28 fibers, UV-cured epoxy, stretching setup, optical spectrum analyzer, supercontinuum laser, polarization controller.
4：Experimental Procedures and Operational Workflow:
Fibers are cleaved, polished, coupled to SMF-28, heated near the softening point of As2Se3, and stretched while monitoring outputs with continuous-wave light at 1550 nm.
5：Data Analysis Methods:
Transmission spectra are analyzed to determine coupling efficiency, wavelength dependence, and polarization separation.
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