| 摘要(英) |
In this thesis, we proposed a four-wavelength polymer-based arrayed waveguide grating (AWG) multiplexer developed on a silicon substrate, which are suitable for the Coarse Wavelength Division Multiplexing (CWDM) system. The direct butt-joint coupling without micro-lens is adopted for four-wavelength laser chips at the input ports of polymer-based AWG multiplexer developed on silicon substrate.
The numerical simulation results show the central wavelengths of four lanes are 1.271, 1.291, 1.311, and 1.331 micrometer, respectively. The simulated values are approximately 1 nanometer away from theoretical ones. The simulated insertion losses are less than 3 dB at lanes operated at wavelengths of 1.291 and 1.311 micrometer. For the lanes operated at wavelengths of 1.271 and 1.331 micrometer, the insertion losses are less than 4 dB.
The curved polymer optical waveguides are fabricated to study the optical performance. Although the rectangular contour is designed for original waveguides, however bell-shaped optical waveguides are obtained due to over exposure in photo-lithography process. The average measured width of end facets of optical waveguides is 6.7 micrometer, it has an error of 4.29% as compared to the design value of 7 micrometer. While the average measured height of end facets of optical waveguides is 5.68 micrometer, it has an error of 18.81% as compared to the design value of 7 micrometer. The difference of measured insertion losses of bell-shaped optical waveguides is 45.56% as compared to the simulated value.
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