Wide-angle low-loss waveguide branching for integrated optics
Wide-angle low-loss waveguide branching for integrated optics
复制标题
用于集成光学器件的广角低损耗波导分支
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
R. Coalson
中科院分区：
文献类型：
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作者：
D. Min;D. Langer;D. K. Pant;R. Coalson
摘要提出了一种新的宽角度、低损耗、对称Y分支波导。波导配置利用肋用于在下面的平面引导区域中的横向限制。该Y分支结构可以容易地制造而无需额外的工艺步骤。与多模干涉效应的利用一起，在Y分支的楔形部分中波导脊的局部减小减小了辐射损耗。在适当的设计条件下，Y型分支在TE基模波长为870 nm时，分支角为6°时的辐射损耗为2.2 dB，折射率差（Δn/n）为7.1 × 10−4，而传统Y型分支的辐射损耗为12.6 dB。所提出的方法产生了相应的优势，波导设计具有较高的Δn/n比，也可以适用于结合S分支设计。
Abstract A new wide-angle, low-loss, symmetrical Y-branch waveguide is proposed. The waveguide configuration utilizes ribs for lateral confinement in the planar guiding region underneath. This Y-branch structure can be fabricated easily without an additional process step. Together with a utilization of the multimode interference effect, a local decrease of the waveguide ridge in the wedge part of the Y-branch reduces the radiation loss. When proper@ designed, the proposed Y-branch has a radiation loss as low as 2.2 dB at a branch angle of 6° with the index difference (Δn/n) as small as 7.1 × 10−4 at a wavelength of 870 nm in the TE fundamental mode as compared to 12.6 dB for a conventional Y-branch. The proposed method yields corresponding advantages for waveguide designs with a higher Δn/n ratio and can also be adapted in combination with S-branch designs.