Tunable polarization beam splitter of magnetic fluid filled double-core photonic crystal fiber

Abstract

The invention discloses a tunable polarization beam splitter of a magnetic fluid filled double-core photonic crystal fiber, and belongs to the fields of special fibers, fiber communication and signal processing. The polarization beam splitter is based on a double-core photonic crystal fiber structure. The double-core photonic crystal fiber comprises a pure quartz substrate (1), two identical cores (2) and air holes arranged periodically, and the air holes (3) on the upper and lower sides of the cores, the air holes (3) on the left and right sides of the cores and the air holes (5) away from the cores are different in radius. The air holes (6), close to the cores, of the double-core photonic crystal fiber are filled with magnetic fluid. The polarization beam splitter adopts single-channel output. The refractive index of the magnetic fluid is changed along with the intensity of an external magnetic field, and when the outside does not have a magnetic field, the polarized light in a single direction is output by the output end of the double-core photonic crystal fiber, while the other polarized light is not output. When a certain magnetic field is applied from the outside, the coupling length of the two beams of polarized light is changed with the change of the refractive index of the magnetic fluid, so that the energy of the polarized light at the output end is reduced, but the energy of the other polarized light is increased. In certain magnetic field intensity, the polarization mode at the output end of the double-core photonic crystal fiber is converted, so that the polarization mode is tunable.

Description

technical field [0001] The invention relates to a tunable polarization beam splitter for a dual-core photonic crystal fiber filled with magnetic fluid, which belongs to the fields of special optical fiber, optical fiber communication and signal processing. Background technique [0002] Polarizing beam splitter can split a beam of incident light into two orthogonally polarized beams and transmit them in different directions. It is an important device in optical networks. Polarization beam splitters are widely used in optical fiber communication, optical fiber sensing, photoelectric detection and other fields. [0003] In recent years, the design of polarization beam splitters is mainly based on the principles of mode evolution, directional coupling, multimode interference, and Mach-Zehnder interference. Among them, the device based on the principle of mode evolution has the advantages of small size and high extinction ratio, but this device is mainly manufactured on a silico...

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to overcome the problem of complex connection and large loss of the single polarization output of the current single-core photonic crystal fiber and the dual-core and three-core photonic crystal fiber dual-channel output structures

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