Abstract
We present a concept using intermodal cross-phase modulation to enable all-optical temporal, spatial, and spatio-temporal pulse shaping inside a few-mode fiber. The pulse shaping is achieved by all-optically tuning a fiber-based, inline Mach–Zehnder interferometer, which uses two transverse modes of the fiber as interferometer pathways and long-period gratings for mode coupling. We explore the shaping capabilities of such a two-mode Mach–Zehnder interferometer and compare simulations based on the multimode generalized nonlinear Schrödinger equation to a simplified model based on the analytical description of intermodal cross-phase modulation. Such an approximated description reduces computation times from hours to less than a minute and proves to be valid for most scenarios, enabling fast and easy prediction of the shaping functionality in such devices.
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Schnack, M., Lüpken, N.M. & Fallnich, C. Intermodal cross-phase modulation enabling all-optical temporal and spatial shaping in few-mode fibers. Appl. Phys. B 124, 203 (2018). https://doi.org/10.1007/s00340-018-7069-8
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DOI: https://doi.org/10.1007/s00340-018-7069-8