A Fiber Bragg Grating - Electromagnetically Induced Transparent
Fast Optical Switch
Posted on 03.05.2021 - 14:28
Here, a novel all-optical switch is modeled in the form of fiber Bragg grating (FBG) based on electromagnetically induced transparency (EIT) phenomena dealing with three-level EIT silicon (Si) nanocrystalline medium. EIT consists of two fields, namely a strong control and a weak probe fields that interact with the medium. Fast-optical switch of the probe is achieved by applying a pulsed control field which relies on both steady-state and transient density matrices. The effects of four significant parameters of interest, i.e., Rabi frequency of control field, EIT nanocrystal density, FBG length and spontaneous decay rate have been extensively investigated to optimize the probe transmission. Subsequently, the time-dependent density matrix is solved to obtain the response time of the FBG-EIT switch. Eventually, FBG is modeled such that low index layers contain EIT material and the high index layers do not. FBG-EIT switch satisfies the criteria of maximum (max) transmission and minimum (min) rise time to give out the optimal operational condition. Despite the optical switch is in switching OFF mode at Ωc=0 THz demonstrating a high FBG reflectance, however the reflectance suddenly vanishes at a certain Ω ௦ to satisfy the equivalence of low and high refractive indices (switching ON). Therefore, a fast-optical switch is envisaged operating as large as 100 GHz in theory.
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Mousavi, Narges Shafii; Parvin, Parviz; Ilchi-Ghazaani, Maryam (2021): A Fiber Bragg Grating - Electromagnetically Induced Transparent Fast Optical Switch. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5398284.v2
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Narges Shafii Mousavi