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Polysilane Optical Fiber Disclosure Number: IPCOM000020606D
Original Publication Date: 2003-Dec-03
Included in the Prior Art Database: 2003-Dec-03
Document File: 2 page(s) / 68K

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Polymer photonic crystal hollow-core fibers are drawn by forcing a viscous polymer solution of polysilane through a spinneret orifice. The pattern of the orifice has a large centered hole, which corresponds to the hollow-core, and many small holes, which form a two-dimensional photonic crystal lattice. Each of the holes is connected to pressurized N2 gas. The pressures are regulated to different pressures to obtain the desired photonic crystal hole pattern. The drawn polymer fiber passes through hot zones for a pre-bake process and a post-bake process. Through these processes, the polymer becomes a silica-like photonic crystal hollow-core fiber.

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Polysilane Optical Fiber

      Disclosed is a polymer optical fiber and its fabrication process for short  span optical data transmission, such as optical interconnects for computers. Although  the optical absorption losses in polymer fibers are greater than those of quartz  optical fibers, polymer photonic crystal hollow-core fibers1) are expected to have  smaller absorption losses than conventional bulk optical fibers, because their optical  fundamental modes are not located in the polymer part but in the hollow portions,  which are naturally filled with air.

      The fabrication method so far reported is fiber drawing using a  polymer  preform, which is a stack of polymer tubes.2) This fabrication method is intrinsically  expensive and does not scale well for mass production. In this disclosure, polymer photonic crystal hollow-core fibers are fabricated without  using preforms but made by using a continuous drawing of fibers  from a spinneret  capillary orifice similar to a nylon fiber melt spinning process.3)

      Poly(methylphenylsilane) is dissolved in toluene and forms a high-viscosity  polymer solution. The solution is ejected into the air from a metal spinneret orifice,  which corresponds to the form to produce the polymer photonic crystal hollow-core  fiber shown in Fig.1. The large hole in the center of the fiber  is the fiber  hollow-core, and the small holes are the two-dimensional photonic crystal lattice for  850 nm light. 

      Figure 2 shows a schematic cross sectional view of the spinneret for this  fiber drawing process. The four narrow pipes in the figure are the gas pipes to supply  nitrogen gas to small holes in the photonic crystal lattice. In the schematic figures,  the number of pipes does not correspond to the actual number of  holes, and also the  pipe for the large central hole is not shown, which is also connected to a nitrogen  gas supply.

      The viscous polymer solution is fed into the spinneret and the fiber is drawn  with a big hole and many small holes. The nitrogen pressures for each of the pipes are  controlled separately to tailor the sizes and positions of each  of the holes. It is  not necessary to provide different pressures to each of the holes. The rotational  symmetry allows for the distribution of ...