Optical Fiber Communication Mynbaev Pdf 13
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The usage of nanomaterials as NLO material has been well discussed for decades. In recent years, semiconductor nanowires (NWs) have attracted lots of attention. Theoretically, they possess a higher NLO coefficient compared with the bulk material, and the enhancement is tunable by the size and shape of nanostructure. Moreover, their low divergence angle and high propagation loss can achieve a nanoscale focusing effect and thus simplify the system3,8,9,10,11. In this paper, a waveguide based FROG method with a single ZnO nanowire is demonstrated. By manipulating the nanowire with a fiber taper, the FROG signal collections are achieved and the phase, and the energy of a pulse can be retrieved. With this scheme, a 300-nm-wide supercontinuum pulse is successfully retrieved, which is realized by synchronizing the pulse and the reference laser. Besides, the sensitivity of FROG is greatly improved by using a single nanowire without any free-space optics, so the entire system is much simpler and more compact than conventional system.
(a) Schematic illustration of a single ZnO nanowire. (b) Schematic of using ZnO NW as nonlinear material and fiber taper waveguide. (c) Schematic of the ZnO NW based FROG setup. (d) Schematic of the FROG setup. (e) Image of the ZnO NW based FROG setup, with the z axis pointing to the top.
Figure 1. (a) Schematic illustration of a single ZnO nanowire. The polarization direction of the pump is along z axis. (b) Schematic of using ZnO NW as nonlinear material and fiber taper waveguide. (c) Schematic of the ZnO NW based FROG setup. (d) Schematic of the FROG setup. (e) Image of the ZnO NW based FROG setup, with the z axis pointing to the top.
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