改良式64 × 64絕緣層上矽晶陣列式波導光柵之研究

Abstract

本研究在於設計改良一個光纖通訊被動元件中的陣列式波導光柵分波多工器，並且完成一個規格64 × 64通道、50 GHz的陣列式波導光柵分波多工器。在陣列式波導光柵，我們利用陣列波導間之固定光程差產生空間及波長之分波效應，並分析其陣列波導在自由傳佈區接面之波導間距對系統插入損失及串音之影響，並分析漸變式波導在輸入及輸出埠與自由傳佈區接面對系統之影響。 在64 × 64陣列式波導光柵分波多工器應用方面，我們著重提出一種光波長選擇的設計，藉由結合陣列式波導光柵及電光調變器所組成之光波長選擇調變器。藉以控制電光調變器達到篩選波長的機制，藉此從波導中取出特定信號，以達到可控制特定波長信號的路由路徑。此光波長選擇調變器可應用於全光高密度分波多工的傳輸網路系統中，可達到波長選擇的目的。The passive device of arrayed waveguide grating (AWG) are the most potential and developmental devices in wavelength division multiplexing (WDM). This thesis focus on improved designing AWG in optical fiber communication and building a design of 64 × 64 channels, 50GHz AWG which have good performance based on silicon-on-insulator (SOI) wafer. In AWG, we use the technique of the constant path length difference at adjacent waveguide of waveguide array to realize the spatial and spectrum division, and discuss the waveguide separation influence at the junction of free propagation region and arrayed waveguide. We also concern the insertion loss and crosstalk affected by applying tapered waveguide at the interface between the input/output waveguide and free propagation region. In the application of 64 × 64 AWG device, we focus on the new optical wavelength selector. The optical wavelength selective switch which combines AWG structure and electro-optic switches structure. We demonstrate that some particular channel can be selected independently by controlling the corresponding electro-optical switches. Such a device can be applied into reconfigurable WDM systems in the future.