功率分配器和定向耦合器
光学
材料科学
光电子学
氮化硅
极化(电化学)
硅
宽带
分束器
物理
物理化学
化学
激光器
作者
Bishal Bhandari,Chul-Soon Im,Om Raj Sapkota,Sang‐Shin Lee
出处
期刊:Optics Letters
[The Optical Society]
日期:2020-10-26
卷期号:45 (21): 5974-5974
被引量:22
摘要
The implementation of a polarization beam splitter (PBS) on a silicon nitride platform remains challenging owing to its relatively low index. We therefore propose a silicon nitride PBS that exploits serially cascaded asymmetric directional couplers (ADCs), leading to a high polarization extinction ratio (PER) over a broad bandwidth. The ADC spatially routes incident light through polarization-selective mode coupling under a small footprint of 112 µm. The proposed PBS does not require an active phase control. It is thus effectively realized via a single-step lithography process. The measured transverse-electric and transverse-magnetic PERs were determined to be above 23 dB and 10 dB over an 80-nm bandwidth, respectively, spanning λ = 1520 − 1600 n m . The proposed device is thus anticipated to play a key role in providing polarization diversity in photonic-integrated circuits.
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