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http://dx.doi.org/10.3807/JOSK.2013.17.5.433

Evaluation of Chromatic-Dispersion-Dependent Four-Wave-Mixing Efficiency in Hydrogenated Amorphous Silicon Waveguides  

Kim, Dong Wook (Department of Physics, Inha University)
Jeong, Heung Sun (Department of Physics, Inha University)
Jeon, Sang Chul (National Nanofab Center)
Park, Sang Hyun (National Nanofab Center)
Yoo, Dong Eun (National Nanofab Center)
Kim, Ki Nam (National Nanofab Center)
An, Shin Mo (Graduate School of Information Technology, Inha University)
Lee, El-Hang (Graduate School of Information Technology, Inha University)
Kim, Kyong Hon (Department of Physics, Inha University)
Publication Information
Journal of the Optical Society of Korea / v.17, no.5, 2013 , pp. 433-440 More about this Journal
Abstract
We present an experimental and numerical study of spectral profiles of effective group indices of hydrogenated amorphous silicon (a-Si:H) waveguides and of their chromatic-dispersion effect on the four-wave-mixing (FWM) signal generation. The a-Si:H waveguides of 220-nm thickness and three different widths of 400, 450 and 500 nm were fabricated by using the conventional CMOS device processes on a $2-{\mu}m$ thick $SiO_2$ bottom layer deposited on 8-inch Si wafers. Mach-Zehnder interferometers (MZIs) were formed with the a-Si:H waveguides, and used for precise measurement of the effective group indices and thus for determination of the spectral profile of the waveguides' chromatic dispersion. The wavelength ranges for the FWM-signal generation were about 45, 75 and 55 nm for the 400-, 450- and 500-nm-wide waveguides, respectively, at the pump wavelength of 1532 nm. A widest wavelength range for the efficient FWM process was observed with the 450-nm-wide waveguide having a zero-dispersion near the pump wavelength.
Keywords
Silicon photonics; Nonlinear optic waveguide; Four-wave-mixing;
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