TITLE

Raman gain and nonlinear optical absorption measurements in a low-loss silicon waveguide

AUTHOR(S)
Rong, Haisheng; Liu, Ansheng; Nicolaescu, Remus; Paniccia, Mario; Cohen, Oded; Hak, Dani
PUB. DATE
September 2004
SOURCE
Applied Physics Letters;9/20/2004, Vol. 85 Issue 12, p2196
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We fabricated a low-loss (∼0.22 dB/cm) rib waveguide (WG) in silicon-on-insulator with a small effective core area of ∼1.57 μm2 and measured the stimulated Raman scattering gain in the WG. We obtained 2.3 dB Raman gain in a 4.8-cm-long S-shaped WG using a 1455 nm pump laser with a cw power of 0.9 W measured before the WG. In addition, we observed nonlinear dependence of Raman gain and optical propagation loss as a function of the pump power. Our study shows that this mainly is due to two-photon absorption (TPA) induced free carrier absorption in the silicon WG. We experimentally determined the TPA induced free carrier lifetime of 25 ns, which agrees well with our modeling.
ACCESSION #
14546720

 

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