| Information technology is the forerunner of today's industry. Internet is the most important part of the modern information technology. To resolve the"traffic jam"problem of the current internet, we must expand the"Infobahn"based on WDM (Wavelength Division Multiplexing) technology, in which optical devices are widely used. Based on the above technology, the fiber optic communication devices develop rapidly. The fiber optic communication devices include optical transmission devices and optical switch devices etc.. There have been many WDM devices which can be used today, after several years'development. Especially great progresses of WDM, WDM illuminant and WDM optical amplifier make fiber optic communication approach nearly to all-optical network. But optical switch devices, including OXC, OADM and its basic device optical switch are mostly optical electric impure. There have been some products of optical switch in the market, but they are not mature and need to be improved.Polymeric photon devices attract more people's attention these years. This paper does some ground work about the design of the optical path of three kinds of optical switch structure.Firstly, this paper makes a concise summarize of polymeric photon devices especially optical switch and make a analysis of the direction of the optical switch's development. Optical switch is the key part in the optical communication. Optical switch can realize beam's switch of time, space and wavelength, and is very useful in the optical network. Nowadays manyresearch institutions are exploring the second generation of optical switch. But it is not clear that what kind of technology is needed. In the 21st century, similar with the development of the WDM technology worldwide, optical switch can easily present chances of business and science.Secondly, this paper introduces some theory. Light is a kind of electromagnetic wave. The essential method about light transmitting in the waveguide is electromagnetic approach that is wave optics method. This method deduces the wave equation and Helmholtz equation from Maxwell equation, and solves them at certain boundary conditions. Generally speaking, we have to use waveguide theory to analyze the mode specialty of all waveguide structures correctly. This paper mainly introduces some waveguide mode theory used during designing optical switch's waveguide structure, MZ, directional coupling and MMI three kinds of optical switch's theory, BPM (Beam Propagation Method) - the approach of calculating light transmitting in the waveguide.Thirdly, this paper designs a waveguide of rectangular structure according to the material based on the forward theory. And this paper works out the cut-off-thickness of several modes, by which the single mode waveguide's structure turn out to be 4μm×4μm. Considering the specialty of the inorganic-organic hybrid material made by ourselves, this paper designs a structure called quasi-rectangle, simulate its mode and its electric field and analyze the influence of inorganic-organic hybrid's refractive index upon optical field's distribution. According to the problems in the RIE process, this paper designs a load-ridge waveguide and analysis its mode and optical field distributing. Comparing"S-sin, S-arc, S-cos"that three structures: S-cos turns out to be the best. And this paper discusses the modes of the quasi-rectangular and load-ridge structures and the refractive index of the inorganic-organic hybrid. This paper designs the waveguide structure of MZ, directional coupler and MMI optical switch. The waveguide section uses the rectangular structure. Comparing losses of different Y splitters of MZ optical switches, this papergets the conclusion that the loss is the least when the landscape orientation length is 3000μm. Then I work out the waveguide structure of the MZ optical switch. Similarly using the rectangular structure, this paper calculates the coupling length of the directional coupler, it is 1300μm. Adding the input and output waveguide this paper optimizes the coupling length and ascertain the coupling part length of the coupler is 3490μm. This paper sums up the formulas of the MMI coupling length and fixes the coupling length on 177.5μm. With the input and output waveguide on, this paper optimizes the coupling part length, it is 2958μm. A mask is made out using the obtained parameters.At last, this paper introduces the fabricate process and the testing method of polymer waveguide devices. This paper tests the approximately field facular of the quasi-rectangle waveguide. Comparing the result of the experiment with the result of the simulation, we find the former correspond to the latter. |
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