Abstract
A polarization beam splitter is an important component of modern optical system, especially a splitter that combines the structural flexibility of photonic crystal fiber and the optical modulation of functional material. Thus, this paper presents a compact dual-core photonic crystal fiber polarization beam splitter based on thin layer As2S3. The mature finite element method was utilized to simulate the performance of the proposed splitter. Numerical simulation results indicated that at 1.55 μm, when the fiber device length was 1.0 mm, the x- and y-polarized lights could be split out, the extinction ratio could reach −83.6 dB, of which the bandwidth for extinction ratio better than −20 dB was 280 nm. It also had a low insertion loss of 0.18 dB for the x-polarized light. In addition, it can be completely fabricated using existing processes. The proposed compact polarization beam splitter is a promising candidate that can be used in various optical fields.
Highlights
A polarization beam splitter [1] (PBS) is an extremely common optical device in optical fiber communication, optical fiber sensing, and optical measuring systems that can split an incident light into two orthogonally polarized lights that constitute a fundamental mode (FM)
An excellent fiber-based polarization beam splitter [1] (PBS) is mainly characterized by the high birefringence (HB) effect and a short coupling length
Because of HB, the x- and y-polarization modes in the same core FM cannot degenerate, a state that is conducive for beam splitting
Summary
A polarization beam splitter [1] (PBS) is an extremely common optical device in optical fiber communication, optical fiber sensing, and optical measuring systems that can split an incident light into two orthogonally polarized lights that constitute a fundamental mode (FM). There are many waveguides to achieve the polarization beam splitting effect, such as those of the prism, planar waveguide, photonic crystal, metasurface, and optical fiber [2,3,4,5,6]. Fiber-based PBS research is very popular due to its integrability and low cost. Conventional fibers have an insufficient design flexibility and are glass-based, which is not suitable for excessive processing. The performance of PBSs using conventional fibers as carriers is greatly restricted
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