A polarization-maintaining optical fiber side-view imaging axis fixing method and device

Abstract

Provided is a side-view imaging azimuth-aligning apparatus for a polarization maintaining fiber. The apparatus is formed by an optical path portion, a rotation control portion, and an azimuth-aligning program, two optical paths arranged in the vertical manner and the rotation control portion are fixed on the same mechanical platform, the rotation control portion and a host computer are connected via an RS232 interface, and the optical paths and the host computer are connected via a PCI bus. A side-view imaging azimuth-aligning method for the polarization maintaining fiber includes four steps. According to the method and the apparatus, azimuth aligning is accomplished by directly employing the symmetry of a characteristic curve, the construction of a standard curve is not needed, the calculation amount is reduced, the speed and the precision for azimuth aligning are improved to a certain extent, and the problem that the standard curve is not universal for different types of fibers is well solved.

Description

technical field

[0001] The invention relates to a polarization-maintaining optical fiber side-view imaging axis fixing method and device, and belongs to the technical fields of optical fiber communication and optical fiber sensing. Background technique

[0002] A general axisymmetric single-mode fiber can transmit two linearly polarized orthogonal modes or two circularly polarized orthogonal modes at the same time. The two orthogonal modes will propagate forward at the same speed in the fiber, so the polarization state will not change during the propagation. Due to the existence of non-axisymmetric and bending in the actual optical fiber, the two orthogonal modes will be coupled during the propagation process, and the result is that the polarization state of the light wave changes during the propagation process. For this reason, a polarization-maintaining fiber that can maintain the polarization state of light waves has been developed, that is, a polarization-maintaining fi...

Examples

Embodiment Construction

[0034] See figure 1 — Figure 7 , 1. A polarization-maintaining optical fiber side-view imaging axis-fixing device according to the present invention, the principle diagram of its overall structure is as follows image 3 As shown, it is mainly composed of three parts: the optical path part, the rotation control part and the fixed axis program. The position connection relationship between the three is: the two vertically placed optical paths and the rotation control part are fixed on the same mechanical platform, and then the rotation control part and the host computer (fixed axis program) are connected through the RS232 interface, and the optical path is connected through the PCI bus. And host computer (fixed axis program).

[0035] The optical path part mainly realizes the real-time acquisition and display of the fiber image during the axis fixing process, the schematic diagram is as follows Figure 4 shown. The device adopts a vertically placed dual optical path scheme, ...

technical field

[0001] The invention relates to a polarization-maintaining optical fiber side-view imaging axis fixing method and device, and belongs to the technical fields of optical fiber communication and optical fiber sensing. Background technique

[0002] A general axisymmetric single-mode fiber can transmit two linearly polarized orthogonal modes or two circularly polarized orthogonal modes at the same time. The two orthogonal modes will propagate forward at the same speed in the fiber, so the polarization state will not change during the propagation. Due to the existence of non-axisymmetric and bending in the actual optical fiber, the two orthogonal modes will be coupled during the propagation process, and the result is that the polarization state of the light wave changes during the propagation process. For this reason, a polarization-maintaining fiber that can maintain the polarization state of light waves has been developed, that is, a polarization-maintaining fi...

Examples

Embodiment Construction

[0034] See figure 1 — Figure 7 , 1. A polarization-maintaining optical fiber side-view imaging axis-fixing device according to the present invention, the principle diagram of its overall structure is as follows image 3 As shown, it is mainly composed of three parts: the optical path part, the rotation control part and the fixed axis program. The position connection relationship between the three is: the two vertically placed optical paths and the rotation control part are fixed on the same mechanical platform, and then the rotation control part and the host computer (fixed axis program) are connected through the RS232 interface, and the optical path is connected through the PCI bus. And host computer (fixed axis program).

[0035] The optical path part mainly realizes the real-time acquisition and display of the fiber image during the axis fixing process, the schematic diagram is as follows Figure 4 shown. The device adopts a vertically placed dual optical path scheme, ...

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