Abstract
In this work, we used R-Soft software to simulate the coupling between multi-core photonic crystal fibers (PCFs) with different core diameters and distances. The simulation results show that the core distance within two wavelengths, different core diameters between the mode fields can be effectively coupled. The results are consistent with the evanescent wave propagation length of calculation. According to the designed structure based on the high temperature melting method, the multi-core PCF can be obtained by using two times technique of the optical fiber drawing tower. The core production of (2-, 7-, 19-core PCF) of coherent synthesis experiment, observed apparent interference fringes in the experiment, which shows that the mode fields of the multiple cores meet the coherent conditions. This article provides a theoretical basis and guidance to effectively achieve a coherent coupling for the further design and preparation of multi-core fibers (more than 19 cores).
Highlights
Fiber laser with its many advantages such as simple structure, good cooling efficiency, and low pumping threshold, has a broad application prospect in the field of industry and military
Incoherent synthesis is done through a series of beam shaping and transformation, the laser beam will be more than one laser combined together, the synthesis can make the total laser output power increase, but the beam quality will decline.[2]
In this article, the mode field coupling condition was simulated by using R-Soft with different core distances for the multi-core photonic crystal fibers (PCFs)
Summary
Fiber laser with its many advantages such as simple structure, good cooling efficiency, and low pumping threshold, has a broad application prospect in the field of industry and military. The self organization of coherent synthesis in PCF cores is similar to the laser array coherent, self-organization, and the requirement of experimental structure is lower than that of laser array.[5] The multi-core coherent combining is realized completely inside the fibers, which avoids the external coupling between multiple lasers, as long as a reasonable structure of multi-core optical fibers can be made. This can significantly improve the output power, so it has great prospects of development
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