Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36261
Title: CMOS-compatible 2-bit optical spectral quantization scheme using a silicon-nanocrystal-based horizontal slot waveguide
Authors: Kang, Z
Yuan, JH
Zhang, XT
Wu, Q
Sang, XZ
Farrell, G
Yu, CX
Li, F
Tam, HY 
Wai, PKA 
Issue Date: 2014
Publisher: Nature Publishing Group
Source: Scientific reports, 2014, v. 4, 7177 How to cite?
Journal: Scientific reports 
Abstract: All-optical analog-to-digital converters based on the third-order nonlinear effects in silicon waveguide are a promising candidate to overcome the limitation of electronic devices and are suitable for photonic integration. In this paper, a 2-bit optical spectral quantization scheme for on-chip all-optical analog-to-digital conversion is proposed. The proposed scheme is realized by filtering the broadened and split spectrum induced by the self-phase modulation effect in a silicon horizontal slot waveguide filled with silicon-nanocrystal. Nonlinear coefficient as high as 8708 W-1/m is obtained because of the tight mode confinement of the horizontal slot waveguide and the high nonlinear refractive index of the silicon-nanocrystal, which provides the enhanced nonlinear interaction and accordingly low power threshold. The results show that a required input peak power level less than 0.4 W can be achieved, along with the 1.98-bit effective-number-of-bit and Gray code output. The proposed scheme can find important applications in on-chip all-optical digital signal processing systems.
URI: http://hdl.handle.net/10397/36261
EISSN: 2045-2322
DOI: 10.1038/srep07177
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