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Low-power 1×2 all-optical switching in
a silicon double coupler microring resonator* |
| Dou NA , Chunfei LI , |
| Department of Physics,
Harbin Institute of Technology, Harbin 150001, China; |
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Abstract Low-power 1×2 optical switching in a double coupler ring resonator (DCRR) made by a silicon nanoscale waveguide based on two photon absorption (TPA) is analyzed theoretically. The TPA originates from a femtosecond pump light at 400 nm, which enters the DCRR together with a CW signal light at 1.55 mm through the input port. TPA makes the silicon free-carrier concentration change, which is proportional to the change of reflective index. Our numerical simulation shows that when average pump power reaches 2 mW, it will induce the 10−3 refraction-index change and the π-phase shift of signal light, after which 1×2 all-optical switching can be realized.
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Issue Date: 05 March 2009
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