Abstract
A Hollow-core Anti-resonant Fiber (ARF) has many advantages in device applications, such as low cladding density, low nonlinearity, high damage threshold, and excellent polarization characteristics by adjusting the structure and filling a metal. A method of on-line copper coating on the inner hole of hollow-core anti-resonant fiber cladding during drawing is proposed in this paper, and the related polarization characteristic of the ARF is studied. The theoretical and experimental results show that the ARF has good polarization characteristics after coating due to the coupling of copper film and core mode. Polarized light at 860 nm shows the best polarization characteristics. When the ARF is 1 mm, 1.5 mm, and 2 mm in length, its crosstalk is more than 20 dB which works well in communications applications. These characteristics indicate that the ARF coated copper film has a good application prospect in the field of polarization communication.
Highlights
In recent years, the fabrication of miniaturized and integrated functional microstructured optical fiber (MOF) devices has attracted great attention and exponentially risen for its flexible and controllable structure, adjustable dispersion and birefringence [1], [2]
These characteristics indicate that the Anti-resonant Fiber (ARF) coated copper film has a good application prospect in the field of polarization communication
The light source is an Ultra Wideband Light Source (NKT Photonics SL-300), Light is coupled to an ARF through a single-mode fiber (SMF) and a circular polarizer
Summary
The fabrication of miniaturized and integrated functional microstructured optical fiber (MOF) devices has attracted great attention and exponentially risen for its flexible and controllable structure, adjustable dispersion and birefringence [1], [2]. In order to achieve good polarization characteristics of optical fiber devices, some researchers begin to combine metal with optical fiber finding it can improve the polarization of optical fiber devices effectively [8]–[12] It is because surface plasmon resonance (SPR) between metal and dielectric can be produced when free electrons interact with the light on the metal surface. Basak studied the polarization properties of suspended core microstructured optical fibers (SC-MOFs) with hexagonal lattice structure, having a single gold-filled hole along the horizontal axis most recently [12]. These reported devices have good polarization characteristics, they are only capable of working in common communication band instead of high-power transmission and other communication bands
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