Font Size: a A A

New Type Of Photonic Crystal Fiber And Photonic Crystal Is The Research And Design Of Optical Waveguide Slow

Posted on:2013-12-07Degree:MasterType:Thesis
Country:ChinaCandidate:J LiangFull Text:PDF
GTID:2248330371973261Subject:Condensed matter physics
Abstract/Summary:PDF Full Text Request
Photonic crystal (PC) is a new kind of artificial material, the dielectric of which is distributed periodically in the scale of wavelength. Since it has the property of photonic band gap and photonic localization, it is possible for people to manipulate and control photons. Photonic crystal fibers (PCF) and photonic crystal waveguides (PCW) are two of the most important applications, therefore, the improvement of the propagating light in PCF and PCW is significantly important for the construction of all optical networks. The research on PC is chosen to be one of the ten hottest researching areas by "Science", and it really has significant researching values. Here in this paper, we mainly study the birefringence of PCF and the slow light effect of PCW and PCF theoretically.The main contents of the paper are as follows:(1) The concept, properties, applications and simulation methods are introduced in the first section. The concept of PCF and PCW are introduced in detail. Besides, slow light effect and its status quo of development are also introduced.(2) The plane wave expansion (PWE) method is introduced to simulate the birefringence of the PCF. The influences of the shape of the elliptical holes and the defect of the core on the birefringence are analyzed. The shape of the holes in the outer cladding is changed to analyze the dispersion property. The results show that the birefringence is sensitive to the air holes of the inner cladding and core defect, while the dispersion is sensitive to the outer cladding air holes. Finally, we obtain the PCF with the properties of high birefringence, flattened dispersion and small mode area, where the birefringence can reach10-3, and it could be used in numerous applications, such as fiber sensors, fiber communication systems and nonlinear effects, and so on.(3) We further study the birefringence of the PCF because the two polarized modes may couple with each other, causing the power loss and inter-modal dispersion, and propose a novel kind of single-mode single-polarization (SPSM) PCF. By introducing PWE method analyzing the effects on the wavelength scale and bandwidth of the geometric parameters of the PCF, such as the shape of the elliptical holes and the diameter of the circle holes. Finally, a novel SPSM PCF with the broadest bandwidth of700nm is obtained, by optimizing the geometric parameters of the air holes in the cladding.(4) The slow light effect in the PCW is discussed using PWE method. By opposite shifting upper and lower rows of the air holes adjacent to the waveguide, the symmetry of the PCW is destroyed, and therefore the slow light effect is modulated effectively. We obtain different group index with different bandwidth to meet various applications. Besides,2D and3D PWE method are introduced to simulate the same PCW structure, and find the effect of the thickness of the PCW on the slow light effect. It is important for PCW fabrication, actually.(5) The slow light in photonic bandgap fiber (PBGF) is analyzed theoretically in detail. We modulate the slow light effect by infiltrating microfluid into some air holes in the cladding. Meanwhile, with different index of the microfluid, we analyze the slow light effect. Finally, we obtain the group index of6with the bandwidth over100mm in this kind of PBGF, and this is very useful in short-distance optical communications, optical delay lines and optical sensors.
Keywords/Search Tags:photonic crystal, birefringence, single-mode single-polarization, slow light, dispersion
PDF Full Text Request
Related items