Abstract
We present an optofluidic nonlinear coupler fabricated by selective filling of two strands of a photonic crystal fiber with the liquid CCl4 which exhibits a large ultrafast Kerr nonlinearity. We demonstrate power dependent switching in this novel optofluidic device. The large thermo-optical effect of liquids enables us to tune the behavior of the nonlinear coupler by changing the coupling strength with temperature. This opens the road towards flexible designs and realization of a new class of tunable ultrafast nonlinear couplers with switching times below 1 ps.
Highlights
In the linear regime we cannot control the output power ratio for a fixed length of the device
The situation is changed for the nonlinear coupler (NLC)
For fused silica fiber couplers as well as for twin-core photonic crystal fibers, the nonlinear coupling is limited by the nonlinear refractive index n2 of the host material
Summary
14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany 2ICFO - Institut de Ciencies Fotoniques, and Universitat Politecnica de Catalunya, Mediterranean Technology Park, 08860 Castelldefels, (Barcelona), Spain
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