الفهرس Only 14 pages are availabe for public view
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Abstract
The problem of coupling between optical fiber and hollow waveguide is studied. The hollow waveguide modal solutions are derived using two methods: leaky mode analysis and the novel “quasi-leaky-mode” analysis method. The former is traditional approximate method for such leaky structures, where the latter is a novel technique that stems from grouping the radiation modes in packets and each packet represents one of the quasi-modes. The technique is exercised on the case of hollow dielectric waveguides, both the field profile and the propagation losses are calculated using this new technique and validated versus both the leaky mode analysis and measurements. br A novel method for fabrication of hollow waveguides on silicon using simple silicon micromachining techniques is described; and the optimized process parameters are reached; we demonstrated the robustness of the process by fabricating of hollow waveguides and measuring their optical performance. Measurement came in good agreement with the calculated parameters giving confidence in both the theory of quasi-leaky modes and the fabrication process. The low losses measured are encouraging to use the hollow waveguide in various applications.