Fiber Polarization Beam Splitter Research Articles

Ultra-short polarization beam splitter with square lattice and gold film based on dual-core photonic crystal fiber

An octagonal photonic crystal fiber polarization beam splitter with gold-plated film is proposed. The polarization beam splitter characteristics are studied by optimizing the gold film thickness, the cladding air hole diameter and the air hole spacing. At the communication wavelength of 1.55 μm, the coupling ratio can reach the ideal value of 2. Under the optimum geometric parameters, the curve of the coupling length with the working wavelength is flat. When the gold film thickness, cladding air hole diameter and air hole spacing are 15 nm, 1.228 μm and 1.5 μm respectively, the beam splitting length and extinction ratio of the polarization beam splitter are 47.26 μm and −151.43 dB respectively. Because the polarization beam splitter has extremely short beam splitting length and high extinction ratio, it has great value in the field of large-capacity integrated optics and optical communication systems.

Polarization splitter based on dual-core photonic crystal fiber with tellurite glass

A polarization splitter based on dual-core photonic crystal fiber (PCF) with tellurite glass was proposed. The birefringence of the splitter was improved by introducing elliptical air holes. The full vector finite element method is used to analyze the impacts of structural parameters on the coupling length. The results show that the elliptical size is reasonably changed, the extinction ratio can reach 107.21 dB at the wavelength of 1.55 μm, the length of the splitter is 89.05 μm, and the bandwidth is 150 nm when the extinction ratio is more than 20 dB. Besides, we also compare the characteristics of tellurite glass and silica glass photonic crystal fiber polarization beam splitters with the same structural parameters.

Design of a novel multi channel photonic crystal fiber polarization beam splitter

A kind of multi channel dual-core photonic crystal fiber polarization beam splitter is designed. We analyze the effects of the lattice parameters and the thickness of gold layer on the beam splitting by the finite element method. Numerical results show that the thickness of metal layer and the size of the air holes near the fiber cores are closely linked with the nature of the polarization beam splitter. We also obtain that extinction ratio can reach −73.87 dB at 1.55μm wavelength and at 1.41μm, 1.65μm extinction ratio can reach 30.8978 dB and 31.1741 dB, respectively. The comparison of the effect on the characteristic of the photonic crystal fiber with coating no gold is also taken into account.

八边形晶格双芯光子晶体光纤偏振分束器

Based on the birefringence effect,a novel duel-core photonic crystal fiber polarization beam splitter was proposed.Tellurite glass and SF6 glass were used as the material for the PCF,respectively.Using the full-vector finite element method(FEM),the effects of structural parameters on birefringence and relative coupling length were analyzed,and the characteristics of the splitters,such as coupling length,extinction ratio and bandwidth were simulated.The numerical simulation results demonstrate that the tellurite glass splitter has higher extinction ratio and bandwidth than the SF6 glass splitter.The extinction ratio of the tellurite glass splitter is-53.46 dB at the wavelength of 1.55 μm,and the bandwidth is over 120 nm when the extinction ratio is less than-20 dB.

带输入、输出端口的双芯光纤偏振分束器研究

带输入、输出端口的双芯光纤偏振分束器研究

Tunable and switchable all-fiber comb filter using a PBS-based two-stage cascaded Mach–Zehnder interferometer

We propose and demonstrate a novel tunable and switchable all-fiber comb filter by employing a polarization beam splitter (PBS)-based two-stage cascaded Mach–Zehnder (M–Z) interferometer. The proposed comb filter consists of a rotatable polarizer, a fiber PBS, a non-3-dB coupler and a 3-dB coupler. By simply adjusting the polarization state of the input light, the dual-function of channel spacing tunable and wavelength switchable (interleaving) operations can be efficiently obtained. The theoretical analysis is verified by the experimental results. A comb filter with both the channel spacing tunable from 0.18 nm to 0.36 nm and the wavelength switchable functions is experimentally demonstrated.

Novel in-line fiber polarization beam splitter using high-birefringence fiber Bragg grating

This study proposes a novel fiber-type polarization beam splitter (PBS) based on a high-birefringence fiber Bragg grating (Hi-Bi FBG). The reflective and transmitted modes of the Hi-Bi FBG are used to separate the p- and s-waves of an optical signal. The experimental results show that a 36dB extinction ratio can be obtained in the reflective mode. However, in the transmitted mode, the extinction ratio is just 4.78dB since the reflectivity of the Hi-Bi FBG is only 34.75%. It is shown analytically that the extinction ratio in the transmitted mode can be improved to 20dB by specifying a Hi-Bi FBG with a reflectivity of 99%. Finally, it is shown that the Bragg wavelength of the in-line fiber PBS can be tuned electrically to comply with the working wavelength.

Fabrication of biconically fused fiber polarization beamsplitters with various working wavelengths selected using a 1523-nm monitoring laser

The working-wavelength selectability of biconically fused fiber polarization beamsplitters made with extremely weakly fused couplers is presented. The point before or behind the first polarization modulation waist point in the power transfer curve monitored with unpolarized 1523-nm He-Ne laser light was taken as the stopping point in the coupler drawing process. The working-wavelength selection range as wide as 304 nm has been achieved, with the average polarization bandwidth being 34 nm.