The Design And Study On The Control System Of Photonic Crystal Fiber Fusion Splicing Machine

Photonic Crystal Fibers (PCFs) has aroused wide attention since it was developed.In the process of the research, splicing different PCFs to conventional fibers and weldingdifferent PCFs are often involved. However, the current common fiber fusion splicercannot achieve the accurate control of welding energy between PCFs with differentstructure and the alignment of microholes between PCFs, which means it cannot achievethe fast and efficient welding between PCFs. Therefore, a photonic crystal fiber fusionsplicer that can automatically complete the high quality welding between PCFs needed tobe developed. This paper designs and studies the control system of fiber fusion splicer.The main contents are as follows：First of all, this paper introduced PCFs and its features, the development of PCFswelding technology at domestic and overseas, and the significance of this subject; it alsointroduced the basic theory of the control system of PCFs fusion splicer and proposed theoverall structure of the control system of PCFs fusion splicer.Secondly, how to design and implement the control method of display and keyboardsubsystem in the control system was studied. Display and keyboard subsystem mainlyconsists of image LCD display module and keyboard module. Using FPGA to control theVGA module, the control of image LED can be achieved. Rank scanning determinantkeyboard circuit is used in Keyboard scanning circuit.Thirdly, the design and implementation of the control method of thethree-dimensional alignment subsystem was studied. A method that uses the central axisas benchmark for alignment to achieve the alignment of fiber core was studied. Here, thecentral axis of fiber core was determined by using the cross-section image of PCFs,which was gained by the cross-section information method of PCFs. The auxiliaryalignment of cladding air holes was achieved by measuring the maximum intensity oflight, and both hardware and software were designed and implemented. The experimentof using high-precision stepper drive motor to achieve the precise control ofthree-dimensional alignment platform was carried out in laboratory, and the results examined the correctness of the design.Finally, the relevant theoretical knowledge of the heat source of carbon dioxide laserused in PCFs fusion splicer was introduced, and the effects of the power of carbondioxide laser on the radius of the beam and spot size was analyzed theoretically.Meanwhile, a method that uses FPGA to control the pulse width of laser in order toaccurately control the welding time of PCFs was experimented, and the results identifiedthe correctness of the design.