Theoretical Analysis Of One-dimensional Photonic Crystal And Optical Communications Applications

In optical communication, optical information processing devices are used to increase the speed of communication and the capacity of communication. The devices made of photonic crystals have a good control for photonic and these devices have a wide range of applications in optical communication. One-dimensional crystal has the advantages of simple structure, mature manufacturing method and low cost. With the rapid development of technology of optical communication, the devices made of One-dimensional photonic crystal have become common devices. These devices include polarization beam splitter, one-dimensional photonic crystal filter, one-dimensional photonic crystal fiber with air core, medium mirror, etc.One-dimensional photonic crystal is periodic dielectric layered media in one dimension structure. Optical thin film is a special case of one-dimensional photonic crystals. The electromagnetic wave will be formed energy band by the modulation arisen by Bragg scattering. Bandgap may arise between photon energy bands, that is, photonic band gap.In this paper, using transfer matrix method and the Bloch theory, band gap characteristics, polarization, and filter of the one-dimensional photonic crystal are analyzed in a systematic way. The influences of various structure parameters of photonic crystal to its transmission characteristics are analyzed, and the applications of photonic crystal filter device in optical network are discussed.The thesis includes:1. Using transfer matrix method, the band gap characteristics of one-dimensional photonic crystal have been discussed, and at a particular center wavelength, the transmission characteristics of photonic crystal are optimized by changing the refractive index of the dielectric layer, dielectric layer thickness and angle of incidence and other parameters.2. According to the Bloch theory, the photonic crystal band gap characteristics are analyzed with an analysis-method of edge forbidden band. Meanwhile, when the one-dimensional photonic crystal band gap position is analyzed, such an approach is easier than the transfer matrix.3. From multi-beam interference theory, filter characteristics of one-dimensional photonic crystal with defect-layer are analyzed, and the applications of the photonic crystal filter in the optical network device are discussed.4. Using the method of transfer matrix, the transmission characteristics of Bragg fiber are analyzed. Medium mirror is applied for high-reflective film at Cassegrain optical antenna. Cassegrain antenna efficiency is analyzed with primary and secondary mirror size changing, and a new type Cassegrain antenna is put forward, which can solve the secondary mirror blocking waste.