Applications About One-Dimensional Photonic Crystal On Flattening In Erbium-Doped Fiber Amplifier

Photonic crystal(PC) was presented as a new concept and a noval type of artificial microstructrured material in 1980s. The typical PC is composed of dielectrics which have different permittivity cycle from order. According to different spatial structure, there are three kinds of PC: one-dimensional photonic crystal, two-dimensional photonic crystal and three-dimensional photonic crystal. Because photonic crystal can control the flow of photons, its applications has become the research focus of optoelectronics. In this paper, researches based on one-dimensional photonic crystals and the application on flattening improvement about Erbium-Doped Fiber Amplifier (EDFA). The primary content includes:The propagation model of the electromagnetic wave in PC is introduced; The influence of the materials and geometry size on propagation property are analyzed by using the transfer matrix method including both the influence of transmission spectra property of 1D intact periodic PC on the refraction index, the number of periods and the incident angles and the influence of reflection spectra property of 1D defective PC on the number of the period and the depth of the defective layer; In addition, the influence of the disorder index of the materials thickness on 1D intact periodic PC and 1D defective PC are analyzed practically.The development and advantages of Erbium-Doped Fiber Amplifier(EDFA) are introduced; The gain-amplified and gain-flattening principles of EDFA are analyzed. The gain-flattening principle with 1D photonic crystals is putted forward based on 1D photonic crystal's reflection spectrum.The optimization principle and application process of Genetic Algorithm(GA) are introduced; Based on 1D photonic crystal's reflection characteristics the gain-flattening mathematical model of EDFA is established; Experiments with the parameters calculated by GA are simulated, The result shows that from 1530 nm to 1560 nm the gain of EDFA is flatted obviously. To prove the universality of the scheme, take another gain spectrum as an example. And the same scheme is used. Finally, the gain of EDFA is flatted too.