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Optical fiber position determination

A technology of fiber end and reference position, which is applied in the coupling of optical waveguides and other directions, and can solve problems such as high optical loss and MFD mismatch

Inactive Publication Date: 2009-02-25
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology

This spread greatly expands the optical mode field diameter (MFD) and causes a mismatch in the MFD of the two fibers at the splice point, which in turn produces high optical losses in the splice

Method used

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  • Optical fiber position determination
  • Optical fiber position determination
  • Optical fiber position determination

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Embodiment Construction

[0040] A method of splicing two fiber ends to each other, as performed in a fiber splicer such as an automatic fiber splicer, will be described herein. In particular, a method for performing a multi-step shifting operation to place fiber ends in a desired mutual geometric relationship will be described, primarily as part of the process of centering the fiber ends relative to each other.

[0041] As shown in Figure 1, a traditional automatic fusion splicer for splicing optical fibers to each other basically has at least one image capture system, which generally includes: a parallel light source 1, such as a light emitting diode 3 (LED) and a collimator 5, emitting The parallel light beams go to an imaging system 6 comprising an optical system 7 comprising, for example, a multi-lens assembly; an image capture device 9, for example a charge-coupled device (CCD) type plate; and an electronic image processing and analysis unit 11, also called is the image unit. The collimated ligh...

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Abstract

In positioning or aligning ends of optical fibers (13) in relation to each other an offset distance between the fiber ends, the offset distance e.g. being the distance between predetermined reference positions in the fiber ends, is stepwise adjusted using a cascade technique. The method can be executed accurately and fast and be used e.g. in a procedure for core alignment, the predetermined reference positions then being the positions of the cores (14') of the fiber ends such as the positions of the center lines or axes of the cores. Also, the method can be used in a procedure in which the self-focusing effect of optical fibers is used for finding the reference positions, which in this case are the positions of the center lines or axes of the total fiber ends, i.e. center lines or axes of the surfaces of the claddings (14) of the optical fiber ends.; Finally, the method can be used for the longitudinal positioning of the fiber ends in which the gap between end surfaces of the fiber ends is set to a desired value.

Description

[0001] related application [0002] This application claims priority from and has the benefit of Swedish Patent Application 0502951-7 filed 30 December 2005, the entire teaching of which application is incorporated herein by reference. technical field [0003] The present invention relates to the positioning of optical fibers, in particular to methods for moving the ends of optical fibers into said positions, and also to methods and apparatus for splicing optical fibers. Background technique [0004] In recent years, fiber lasers have been considered as solid-state and CO 2 An important substitute for lasers, used in military, aerospace, medical and industrial material processing and other fields. Fiber lasers are attractive primarily due to their high output power combined with excellent beam quality and laser design flexibility. Large mode area double-clad fiber (LMA-DCF) is one of the important components in fiber lasers. To efficiently couple the pump energy into suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/255
Inventor 黄卫平K·阿尔斯特特
Owner TELEFON AB LM ERICSSON (PUBL)
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