材料科学
光学
绝缘体上的硅
包层(金属加工)
光学滤波器
自由光谱范围
光子学
波导管
光纤布拉格光栅
光电子学
制作
激光线宽
硅
硅光子学
波长
折射率
耦合模理论
激光器
物理
医学
替代医学
病理
冶金
作者
Daniel Pereira-Martín,José Manuel Luque‐González,J. Gonzalo Wangüemert‐Pérez,Abdelfettah Hadij‐ElHouati,Í. Molina-Fernández,Pavel Cheben,Jens H. Schmid,Shurui Wang,Winnie N. Ye,Jiřı́ Čtyroký,Alejandro Ortega‐Moñux
出处
期刊:Optics Express
[The Optical Society]
日期:2021-05-10
卷期号:29 (11): 15867-15867
被引量:14
摘要
Spectral filters are important building blocks for many applications in integrated photonics, including datacom and telecom, optical signal processing and astrophotonics. Sidewall-corrugated waveguide grating is typically the preferred option to implement spectral filters in integrated photonic devices. However, in the high-index contrast silicon-on-insulator (SOI) platform, designs with corrugation sizes of only a few tens of nanometers are often required, which hinders their fabrication. In this work, we propose a novel geometry to design complex Bragg filters with an arbitrary spectral response in silicon waveguides with laterally coupled Bragg loading segments. The waveguide core is designed to operate with a delocalized mode field, which helps reduce sensitivity to fabrication errors and increase accuracy on synthesized coupling coefficients and the corresponding spectral shape control. We present an efficient design strategy, based on the layer-peeling and layer-adding algorithms, that allows to readily synthesize an arbitrary target spectrum for our cladding-modulated Bragg gratings. The proposed filter concept and design methodology are validated by designing and experimentally demonstrating a complex spectral filter in an SOI platform, with 20 non-uniformly spaced spectral notches with a 3-dB linewidth as small as 210 pm.
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