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PM fiber alignment

An optical fiber end, polarization maintaining fiber technology, applied in the field of PM fiber alignment, which can solve the problems of inability to accurately measure small changes in the intensity curve, the method is not sensitive enough, and the elliptical core type is difficult to produce stable and consistent angle alignment results.

Inactive Publication Date: 2008-08-20
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, due to fundamental technical limitations, existing alignment techniques, see the aforementioned patent on the POL curve method, have difficulty producing stable and consistent angular alignment results for elliptical core types
For example, the method is not sensitive enough to accurately measure small changes in the intensity profile as the fiber is spun

Method used

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Experimental program
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Embodiment Construction

[0024] in Figure 1a The basic components of an automatic fiber splicer suitable for splicing PM fibers are shown in the schematic diagram of FIG. 1b. Figure 1a It is a schematic diagram of the optical arrangement near the ends of the two PM optical fibers 1 and 1', which will be spliced ​​to each other by the discharge between the tips of the two electrodes 3. The two light sources 11 irradiate the joint position of the optical fiber with parallel light rays from both sides of the optical fiber in two perpendicular directions. Since the fiber itself can work as a cylindrical lens, a varying light intensity distribution appears on the focal plane of the fiber, as observed along a straight line perpendicular to the longitudinal axis of the fiber in the focal plane. By using the appropriate focusing assembly illustrated by the lens system 7, the 4 light intensity distributions obtained in the object plane of the lens assembly, each of which is about each optical fiber and each direc...

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Abstract

The polarization axes of the ends of two PM optical fibers are aligned in an automatic fiber splicer by first linearly aligning the two fiber ends (1, 1'). The fiber end is rotated with a rotatable holder (22) to capture individual images by the camera (9) and subsequently the light contrast curve as a function of the angular position in the image processing and analysis unit (15) controlled by the logic circuit (33) Function OK. The polarization axes are determined from the light contrast curve and subsequently aligned with each other. What is captured is an image of the fiber end and its surrounding area, as seen on the viewing plane. The observation plane is selected to have such a position that the change in the light contrast curve is large enough to allow the determination of the angular position of the polarization axis with sufficient accuracy, for example, the same is true for elliptical core fibers.

Description

Technical field [0001] The present invention relates to the alignment of the fast and slow optical axes of the ends of two polarization maintaining (PM) fibers to be fused to each other, and in particular, to the alignment of an elliptical core fiber with a relatively weak ellipticity. Background technique [0002] This application claims the priority and benefits of Swedish Patent Application No. 0200569-2 filed on February 26, 2002, and the entire teachings of this application are hereby incorporated by reference. [0003] Before the two optical fibers are spliced ​​to each other, in order to minimize the optical attenuation of the light propagating in the optical fiber and passing through the joint, it is necessary to properly align the two optical fibers with each other. In the specific case of aligning two PM fibers with each other, special consideration must be given to the geometry of the fiber. Like traditional optical fibers, commercially available PM fibers have a core ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/255G02B6/38
CPCG02B6/2555G02B6/2551
Inventor W·-P·黄D·瓦林P·林斯科格
Owner TELEFON AB LM ERICSSON (PUBL)