Simulation And Analysis Of Coupling Characteristic In Plastic Twin-Core Photonic Crystal Fibre

The optical fiber communication has been the main carrier of modern communications network. With the development of society, more and more information are required, and this will greatly promote the development and progress of optical fiber communication. The concept of photonic crystal fiber was brought forth long before ten year, then followed by the experiment. Now, photonic crystal fiber has already been put into use. Though the application is initial, it has displayed largish application potence. It will push optical fiber technology to arrive a new high peak.Photonic crystal fiber is superior to conventional optical fiber, and it improves the efficiency of some original optical devices. It will become an important buckstay of optical devices in place of conventional optical fiber. As far as plastic photonic crystal fiber is concerned, it has the merit of both plastic fiber and photonic crystal fiber, and in all probability becomes the first choice media of short-distance and medium and small capacity optical fiber communication system.Twin-core fiber is an important optically coupled device, it works as optical switch in all-optical fiber component. But the fabrication of conventional twin-core is much involved,as comparative the fabrication of twin-core photonic crystal fiber is much easer. Plastic twin-core photonic crystal fiber is the focal point of this paper.In this paper, firstly the priciple, formula and a numerical analysis of beam propagation method which is usually applied in the computer simulation of optical wave-guide devices are introduced at length, and improved according to the structure of optical fiber. Secondly, coupling theory of optical fiber and the application of optical fiber coupler in optical system are introduced. At last, the coupling property of plastic twin-core photonic crystal fiber is simulated in computer with beam propagation method. The variety rules of coupling-length with both wavelength and air holes have been found, and this provide some guide for the fabrication of plastic twin-core photonic crystal fiber.