研究目的
To study the method of autoconvolution for determining the axis of the PCF in transverse and longitudinal light-beam sounding to improve the accuracy of positioning during the connection.
研究成果
The autoconvolution method allows improving the quality of the positioning of the PCF for transverse, angular, longitudinal misalignments, and also by the mutual angle of rotation of the connected PCFs. This method can reduce the loss of the optical signal by increasing the overlap of the mode fields.
研究不足
The main limitation of the proposed method is the presence of axial symmetry of the distribution of the mode field in the cross section. That is, in the first round of the PCF cladding there should be an even number of air holes.
1：Experimental Design and Method Selection:
The study involves the use of the autoconvolution method to determine the position of the longitudinal axis of the photonic crystal fiber and the center of the mode field in the cross section.
2：Sample Selection and Data Sources:
A PCF with a quartz core and one circle with six holes in the cladding was researched.
3：List of Experimental Equipment and Materials:
The measurement was carried out using an experimental setup including a welding device for optical fibers Coringer AFS-
4：Experimental Procedures and Operational Workflow:
The process includes obtaining an image of the PCF field with transverse illumination, forming a one-dimensional signal of the intensity of the distribution of the field, signal offset, filtering and removing the background component of the signal, calculation of the signal autoconvolution, and determination of the coordinate of its maximum value.
5：Data Analysis Methods:
The autoconvolution of the signal was calculated to determine the coordinates of the PCF axis.
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