折射率
多模光纤
包层(金属加工)
光学
带宽(计算)
硅
材料科学
物理
光电子学
计算机科学
电信
光纤
冶金
作者
Alejandro Ortega‐Moñux,L. Zavargo-Peche,Alejandro Maese-Novo,Í. Molina-Fernández,Robert Halir,J. Gonzalo Wangüemert‐Pérez,Pavel Cheben,Jens H. Schmid
出处
期刊:IEEE Photonics Technology Letters
[Institute of Electrical and Electronics Engineers]
日期:2011-10-01
卷期号:23 (19): 1406-1408
被引量:59
标识
DOI:10.1109/lpt.2011.2161866
摘要
The performance of multimode interference (MMI) couplers in silicon waveguides is limited by the high lateral refractive index contrast. Here we propose the use of subwavelength gratings (SWGs) in the lateral cladding regions of the MMI to reduce the index contrast. Our approach significantly reduces the mode phase error while at the same time allowing a single etch step process. Using a z -periodic lateral SWG, we design a 2 × 4 MMI that operates as a 90 ° hybrid for a coherent optical receiver. This complex device exhibits a common mode rejection ratio (CMRR) and a phase error of less than -24 dBe and 2 ° , respectively, over the full C -band. Compared to MMI with a homogenous lateral cladding, using subwavelength refractive index engineering effectively extends the receiver bandwidth from 36 to 60 nm.
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