應用改良式抽絲法實現微小分波多工器之開發及分析

Abstract

當半導體元件愈來愈小時，要實現微小化的光通訊系統就愈形重要。其中，微細化波導結構更是一項關鍵且困難的技術。在本文中，我們改良傳統的抽絲塔，在一定的條件下，可以得到幾微米或幾百奈米等級的微奈米光波導線。此微奈米波導線有極佳的均勻性、幾十公分非常長的長度，可利用製作出來的鎢針以凡得瓦爾力適當地操控。當微奈米波導線與錐形光纖尖端因凡得瓦爾力貼附在一起，光波便可以漸減波的方式耦合進入波導線中，並且有著低於1.0dB/mm的損耗。另外，我們發現在空氣中可成功地利用紫外光膠對微奈米波導線與錐形光纖接點進行接合，利於後續封裝製程。同時配合光波導模擬軟體成功開發出適用於980/1550nm光波的微小分波多工器，其分波比率可達7.85。

Minimizing the waveguide is very important in optical communications as the semiconductor components become smaller and smaller, but the fabrication of low-loss optical waveguides with sub-wavelength diameters remains challenging. In this work, we utilized an improved drawing tower to obtain the silica micro/nano optical wires (MNOWs) with several micrometers or several hundred micrometers. The MNOWs had extremely good diameter uniformity with long length up to tens of centimeters, and they were properly handled with a tungsten needle. The tip of a fiber taper could be attached to a guiding silica wire because of van der Waals attraction between the two, and the power was launched into these wires by evanescent wave. Also, the wires had an average optical loss of less than 1.0dB/mm. Furthermore, we successfully assembled the connection between a fiber taper and an MNOW by UV glue in air to simplify the package process. We used the waveguide simulation software to design the micro wavelength division multiplexer (MWDM) suitable for 980/1550nm light wave, and the MWDM had a high wavelength separation ratio.