摘要
提出了一种新型的Y分支光波导结构。该Y分支波导由一个入射波导、一个过渡波导和一对出射波导组成。过渡波导用于改善入射基模与出射偶对称模之间的场分布匹配 ,有效地提高了功率耦合效率 ,降低了分支耦合损耗。波束传播法 (BPM)数字模拟计算表明 ,该结构在 1 31μm和 1 5 5 μm波长下可分别达到 0 0 41dB和 0 0 5 2dB分支耦合损耗。实验中用等离子化学汽相沉积 (CVD)技术制备了SiO2 分支波导样品 ,在上述两波长下分别测得分支耦合损耗为 0 0 8dB和 0 0 9dB ,基本达到了设计指标。
A novel Y-branch waveguide structure is presented, in which a transitional guide is embedded between an incident channel and an output branch. The transitional guide is used to improve the mode field matching between both the waves supported by the incident and output waveguides. A numerical simulation shows that this geometry can minimize the branching loss to about 0.041 dB at 1.31 μm and 0.052 dB at 1.55 μm wavelength respectively. The samples of this type SiO2 branch waveguide are fabricated by the chemical vapor deposition technology. The measurement on the samples gives good results of about 0.08 dB and 0.09 dB branching loss at 1.31 μm and 1.55 μm wavelengths respectively.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2001年第5期552-555,共4页
Acta Optica Sinica
