1 December 2017 Power requirements reducing of FBG based all-optical switching
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Proceedings Volume 10603, Photonics, Devices, and Systems VII; 1060310 (2017) https://doi.org/10.1117/12.2292536
Event: Photonics Prague 2017, 2017, Prague, Czech Republic
Although Fiber Bragg gratings (FBGs) are well known devices, their using as all-optical switching elements has been still examined. Current research is focused on optimization of their properties for their using in future all-optical networks. The main problem are high switching intensities needed for achieving the changes of the transmission state. Over several years switching intensities have been reduced from hundreds of GW/cm2 to tens of MW/cm2 by selecting appropriate gratings and signal parameters or using suitable materials. Two principal nonlinear effects with similar power requirements can result in the bistable transmission/reflection of an input optical pulse. In the self-phase modulation (SPM) regime switching is achieved by the intense probe pulse itself. Using cross-phase modulation (XPM) a strong pump alters the FBG refractive index experienced by a weak probe pulse. As a result of this the detuning of the probe pulse from the center of the photonic band gap occurs. Using of XPM the effect of modulation instability is reduced. Modulation instability which is the main SPM degradation mechanism. We focused on nonlinear FBGs based on chalcogenide glasses which are very often used in various applications. Thanks to high nonlinear parameters chalcogenide glasses are suitable candidates for reducing switching intensities of nonlinear FBGs.
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Ľubomír Scholtz, Ľubomír Scholtz, Michaela Solanská, Michaela Solanská, Libor Ladányi, Libor Ladányi, Jarmila Müllerová, Jarmila Müllerová, } "Power requirements reducing of FBG based all-optical switching", Proc. SPIE 10603, Photonics, Devices, and Systems VII, 1060310 (1 December 2017); doi: 10.1117/12.2292536; https://doi.org/10.1117/12.2292536

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