Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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Subject: search.filters.subject.Nonlinear optics

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  • Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Experimental Demonstration of a Transient Grating Controlled All-Optical Switch
    (IOP Publishing, 2023) Akın, Osman; Dinleyici, Mehmet Salih
    We demonstrate an on-fiber all-optical switching device based on a transient grating formed by the interference of control laser pulses in a Kerr-type nonlinear material placed in the evanescent region of the fiber. The device can operate in two distinctive modes. First, switching/coupling among the fiber modes using bulk index modulation was investigated and an efficiency of about %0.55 @852 nm was measured. Second, by exploiting Four Wave Mixing (FWM), an all-optical switching that transfers power among light signals with wavelengths of λ 1 = 440 nm and λ 2 = 663 nm was achieved by quasi-phase-matching and fRequency matching in a nonlinear thin polymeric film. The results prove that the introduced switching structure may have the potential to be used in integrated photonic applications such as intensity modulators or controllable couplers.
  • Article
    Citation - WoS: 7
    Citation - Scopus: 8
    An All-Optical Switching Based on Resonance Breaking With a Transient Grating
    (Institute of Electrical and Electronics Engineers Inc., 2010) Akın, Osman; Dinleyici, Mehmet Salih
    A new resonance breaking in-fiber switch as an all-optical network component is investigated and presented. A transient grating is applied to break the transverse resonance of the fundamental waveguide mode and the power coupled into the higher order propagating mode is computed using coupled mode theory (CMT). The coupling of the modes with the grating forming beams in the evanescent region of the waveguide is investigated with four wave mixing (FWM). High conversion efficiency is calculated in the case of perfect phase matching at communication wavelength 1550 nm. The conversion efficiency of the proposed structure is considered in terms of third-order nonlinear susceptibility, and the effect of design and tuning parameters are investigated for grating forming geometry and laser beam intensity, respectively.