Design method of novel optical fiber isolator

Abstract

The invention discloses a design method of a novel optical fiber isolator. In the isolator, a group of new out-of-core waveguide structures which form a certain included angle with the axial directionof an optical fiber are formed in the optical fiber through external operation. The optical field in the fiber core is coupled with the out-of-core waveguide in the transmission process. During forward transmission, the optical field coupled into the out-of-core waveguide is transmitted at a certain distance and is coupled into the optical fiber again, and the energy loss of the optical field isvery small in the process; during reverse transmission, the light field coupled into the out-of-core waveguide is transmitted, guided into a cladding, then transmitted for a certain distance and lostby the optical fiber, and the energy loss of the light field in the process is very large. The group of out-of-core waveguides is called as an optical isolation unit, and an optical fiber isolation system is formed by cascading one or more optical isolation units. The insertion loss and the isolation degree can be controlled by controlling the number of the cascaded optical isolation units; the polarization characteristic of the isolation system can be controlled by controlling the angle distribution of the isolation units on the section. The optical fiber isolation system is called as a novel optical fiber isolator.

Description

technical field [0001] The invention belongs to the field of optical fiber devices, and more specifically relates to a design method of an optical fiber isolator. Background technique [0002] Optical fiber isolator is a passive optical device that only allows one-way light to pass through. Its working principle is based on the non-reciprocity of Faraday rotation. Through polarizing, analyzing and other operations, it will eventually cause small loss of light in forward transmission and reverse transmission. The transmission light loss is large. It is widely used in the field of laser technology and optical communication. The actual production process requires processes such as crystal production, crystal cutting, and device assembly, which are expensive. In addition, due to the optical rotation effect of different wavelengths of light, the polarization deflection angles are different, resulting in the existing optical isolator can only work in a certain bandwidth, and the...

AI Technical Summary

Problems solved by technology

The actual production process requires processes such as crystal production, crystal cutting, and device assembly, which are expensive

In addition, due to the optical rotation effect of different wavelengths of light, the polarization deflection angles are different, resulting in the existing optical isolator can only work in a certain bandwidth, and the isolation at different wavelengths is inconsistent, there is an optimal working wavelength

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