阅读说明：本技术 一种光隔离器 (Optical isolator ) 是由 朱钱生 杨郭杰 徐海涛 曹珊珊 刘志忠 薛驰 薛济萍 于 2020-05-09 设计创作，主要内容包括：本发明提供一种光隔离器,包括磁光效应光子晶体光纤、起偏器、检偏器以及线圈组件,所述磁光效应光子晶体光纤两端分别连接所述起偏器和所述检偏器,所述线圈组件环绕所述磁光效应光子晶体光纤设置,且所述检偏器与所述起偏器具有45°旋转角度差。所述光隔离器能够有效隔绝回波,保证安装所述光隔离器的光学系统的正常工作；采用低衰减的磁光效应光子晶体光纤,能够有效减小使用过程中的光功率损失；所述光隔离器体积较小,便携性好；所述光隔离器经过简单调试即可使用,使用方便。(The invention provides an optical isolator which comprises a magneto-optical effect photonic crystal fiber, a polarizer, a polarization analyzer and a coil component, wherein two ends of the magneto-optical effect photonic crystal fiber are respectively connected with the polarizer and the polarization analyzer, the coil component is arranged around the magneto-optical effect photonic crystal fiber, and the polarization analyzer and the polarizer have a rotation angle difference of 45 degrees. The optical isolator can effectively isolate echo waves, and the normal work of an optical system provided with the optical isolator is ensured; the low-attenuation magneto-optical effect photonic crystal fiber is adopted, so that the optical power loss in the use process can be effectively reduced; the optical isolator is small in size and good in portability; the optical isolator can be used through simple debugging, and is convenient to use.)

1. The utility model provides an optical isolator, its characterized in that includes magneto-optical effect photonic crystal fiber, polarizer, analyzer and coil pack, magneto-optical effect photonic crystal fiber both ends are connected respectively the polarizer with the analyzer, the coil pack encircles magneto-optical effect photonic crystal fiber sets up, just the analyzer with the polarizer has 45 rotation angle difference.

2. The optical isolator of claim 1, wherein a single mode fiber is respectively fused to both ends of the magneto-optical effect photonic crystal fiber, and the polarizer and the analyzer are respectively connected through the single mode fiber.

3. The optical isolator of claim 1 wherein said coil assembly comprises a coil and an alternating power source, said coil being disposed around said magneto-optical effect photonic crystal fiber, and said coil being connected to said alternating power source at each end.

4. A method of debugging an opto-isolator for debugging the opto-isolator of claim 3, comprising the steps of:

(A) laser is injected into the optical isolator through coupling, and a polarization state is obtained through polarizer light:

(B) rotating the analyzer to a 45-degree state relative to the polarizer;

(C) the tail end of the analyzer is connected with the optical power meter to receive the output light;

(D) changing the frequency of the alternating power supply to increase the magnetic field generated by the coil from small to large;

(E) monitoring the change of the optical power counting value and determining the maximum value;

(F) and recording the setting of the relevant parameters of the alternating power supply when the optical power meter records the maximum value as the setting parameters when the optical isolator is used.

Technical Field

The invention relates to the technical field related to optical fiber testing, in particular to an optical isolator.

Background

In an optical fiber test system and an information system which is not built by a cabled optical fiber, an optical isolator is required to be used for preventing adverse effects of backward transmission light generated due to various reasons in an optical path on a light source and an optical path system. The working principle of the optical isolator is mainly the Faraday effect of the magneto-optical crystal. The faraday effect, which is an interaction of a light wave and a magnetic field in a medium, causes a rotation of the plane of polarization that is linearly proportional to the component of the magnetic field in the direction of propagation of the light wave.

The principle of the optical isolator is as follows: the laser can be polarized in one direction when passing through the polarizer, the polarized light rotates 45 degrees after passing through the magneto-optical crystal, the analyzer is also placed according to the polarization direction to enable the polarized light to completely pass through, due to the existence of Rayleigh scattering and other effects, a small part of light can be transmitted along the analyzer, the magneto-optical crystal and the polarizer once as echo, the polarization direction of the light rotates 45 degrees again after passing through the magneto-optical crystal again, the light rotates 90 degrees in the same direction for two times, the polarization direction is orthogonal to the initial direction, the echo is completely blocked outside the polarizer, and the effect of isolating the echo is achieved.

In the prior art, the general insertion loss of the optical isolator is large, the optical isolator is inconvenient to apply to a system which is not built by the cabled optical fiber, and meanwhile, the optical isolator is large in size and not portable enough.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide an optical isolator, which uses a magneto-optical effect photonic crystal fiber, wherein a coil is disposed around the outside, a single-mode fiber is welded to two ends of the optical isolator to connect a polarizer and an analyzer, two ends of the coil are connected to an alternating power supply, and the coil generates a stable magnetic field to generate a faraday effect.

In order to achieve the purpose, the invention provides an optical isolator which comprises a magneto-optical effect photonic crystal fiber, a polarizer, a polarization analyzer and a coil component, wherein two ends of the magneto-optical effect photonic crystal fiber are respectively connected with the polarizer and the polarization analyzer, the coil component is arranged around the magneto-optical effect photonic crystal fiber, and the polarization analyzer and the polarizer have a rotation angle difference of 45 degrees.

Preferably, the two ends of the magneto-optical effect photonic crystal fiber are respectively welded with a single mode fiber, and the polarizer and the analyzer are respectively connected through the single mode fiber.

Preferably, the coil assembly comprises a coil and an alternating power supply, the coil is arranged around the magneto-optical effect photonic crystal fiber, and two ends of the coil are respectively connected with the alternating power supply.

The invention also provides a debugging method of the optical isolator, which comprises the following steps:

(A) laser is injected into the optical isolator through coupling, and a polarization state is obtained through polarizer light:

(B) rotating the analyzer to a 45-degree state relative to the polarizer;

(C) the tail end of the analyzer is connected with the optical power meter to receive the output light;

(D) changing the frequency of the alternating power supply to increase the magnetic field generated by the coil from small to large;

(E) monitoring the change of the optical power counting value and determining the maximum value;

(F) and recording the setting of the relevant parameters of the alternating power supply when the optical power meter records the maximum value as the setting parameters when the optical isolator is used.

Compared with the prior art, the optical isolator disclosed by the invention has the advantages that: echo can be effectively isolated, and the normal work of an optical system provided with the optical isolator is ensured; the low-attenuation magneto-optical effect photonic crystal fiber is adopted, so that the optical power loss in the use process can be effectively reduced; the optical isolator is small in size and good in portability; the optical isolator can be used through simple debugging, and is convenient to use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical isolator according to the present invention.

FIG. 2 is a flow chart of a method for debugging an opto-isolator according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, an optical isolator of the present invention includes a magneto-optical effect photonic crystal fiber 10, a first single mode fiber 11, a second single mode fiber 12, a polarizer 21, an analyzer 22, and a coil assembly 30. The first single-mode fiber 11 and the second single-mode fiber 12 are respectively welded at two ends of the magneto-optical effect photonic crystal fiber 10, one end of the first single-mode fiber 11, which is far away from the magneto-optical effect photonic crystal fiber 10, is connected with the polarizer 21, and one end of the second single-mode fiber 12, which is far away from the magneto-optical effect photonic crystal fiber 10, is connected with the analyzer 22. The analyzer 22 is coaxial with the polarizer 21, and the analyzer 22 and the polarizer 21 are arranged to have a 45 ° rotation angle difference. The coil assembly 30 is disposed around the magneto-optical effect photonic crystal fiber 10, and the side of the magneto-optical effect photonic crystal fiber 10 is completely surrounded by the coil assembly 30. A steady magnetic field can be generated by adjusting the coil assembly 30. The first single-mode fiber 11 and the second single-mode fiber 12 can be conveniently coupled with the test fiber and the tail fiber, and loss in the test and connection processes can be reduced. By adopting the magneto-optical effect photonic crystal fiber 10, the optical isolator has small volume and good portability.

Specifically, the coil assembly 30 includes a coil 31 and an alternating power supply 32, the coil 31 is disposed around the magneto-optical effect photonic crystal fiber 10, two ends of the coil 31 are respectively connected to the alternating power supply 32, and the alternating power supply 32 generates a stable magnetic field when supplying power to the coil 31. The magnitude of the magnetic field is influenced by relevant parameters such as the magnitude and density of the coil 31 and the frequency of the alternating power supply 32. The parameters of the coil 31 are fixed during selection, and the size of the magnetic field can be changed by adjusting the alternating power supply 32 during debugging.

The optical isolator needs to be debugged before being used, and the debugging method comprises the following steps:

(A) laser is injected into the optical isolator through coupling, and a polarization state is obtained through polarizer light:

(B) rotating the analyzer to a 45-degree state relative to the polarizer;

(C) the tail end of the analyzer is connected with the optical power meter to receive the output light;

(D) changing the frequency of the alternating power supply to increase the magnetic field generated by the coil from small to large;

(E) monitoring the change of the optical power counting value and determining the maximum value;

(F) and recording the setting of the relevant parameters of the alternating power supply when the optical power meter records the maximum value as the setting parameters when the optical isolator is used.

Therefore, the debugging method of the optical isolator is simple and quick, and the optical isolator is convenient to use.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.