Study On Slow Light Photonic Crystal Waveguide And Its Application To Optical Buffers

Slow light is to reduce the light propagation speed in the medium.In recent years, becauseof slow light technology can enhance the nonlinear effects of optical fiber transmission, increasingthe laser Q, is key to achieving all-optical network technologies constitute optics and other reasons,and attracted people’s attention. The use of photonic crystal waveguides to realized slow light hasmany advantages compared to other optical technology, including photonic crystal structure isflexible to achieve slow light at room temperature and compact. Which concern the advantages of aflexible photonic crystal structure, the structure can be achieved by fine-tuning the performance ofthe slow-light control, not only can be used for the optical design of the buffer may also be used toenhance the non-linear effect of the medium, and in the passive active integrated optical devices inthe field has broad prospects.Because the photonic crystal lattice vector angle greater than60°, slow light can makemore excellent performance, this article will square lattice rotated45degrees counter-clockwise, theintroduction of a line defect formation W1-type line defect waveguide, using the plane waveexpansion method (PWE) for the design of photonic crystal waveguide structure analysis, thecorresponding group velocity, group velocity dispersion, the normalized delay-bandwidth productperformance parameters such as slow light. By changing the size of the filling ratio, includingchanges in dielectric cylinder radius, the first row or column of the second row of medium radius,filled with the group velocity ratio (radius media column) have increased and then decreased, anddifferent filling distribution is different than the frequency corresponding to the group velocitydispersion of the flat belt. Which is filled by changing the minimum to achieve than the peak groupvelocity of0.028c, the maximum normalized delay-bandwidth product realization is0.5421. Thesame can be optimized by fine-tuning of slow light waveguide width of certain performanceparameters, at the expense of part of the normalized delay-bandwidth product of the conditions forthe slow group velocity of light reaching the maximum0.00789c. The45-degree counterclockwiserotation of the square lattice, the introduction of point defects, coupled cavity forming a photoniccrystal waveguide structure, using the same method for quantitative analysis of its slow opticalparameters, the group velocity at the expense of the conditions under which the normalized delaybandwidth product increased significantly, the maximum normalized delay-bandwidth productreached0.6745. Finally, a detailed description of some measure of cache performance parameters, whichmainly include cache time, cache size and cache-bit length. The length and design of the photoniccrystal defect waveguide line1mm light applied to the cache, by theoretical calculation, themaximum buffer capacity can be achieved as457.9bit, and the maximum delay time is209.96ps,the maximum bit length of buffer6.2m.