Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/11
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Article Citation - WoS: 1Citation - Scopus: 1Experimental Demonstration of a Transient Grating Controlled All-Optical Switch(IOP Publishing, 2023) Akın, Osman; Dinleyici, Mehmet SalihWe 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.Conference Object Citation - Scopus: 13-D Switching Fabric Node Design(ACTA Press, 2004) Dinleyici, Mehmet Salih; Akın, OsmanIn this work we investigate an all-optical switching node that can be controlled by means of a transient grating, which is formed by interference of two Gaussian beams. This design considers 3-D architecture of switching fabrics.. real profile of Gaussian beams and fast switching time requirements. Four Wave Mixing (FWM) technique is applied in the evanescent field region of waveguide, showing chi((3)) nonlinearity. The formed grating is analysed by standart methods to obtain reflection coefficient and then coupling coefficient for power exchange between waveguides.Conference Object Citation - Scopus: 1Lcd Arkaışık Modüllerinde Moire Etkisinin İncelenmesi(Institute of Electrical and Electronics Engineers Inc., 2007) Dinleyici, Mehmet Salih; Akın, OsmanLCD panellerde, Sıvı Kristal (Liquid Crystal) camdan önce parlak ve homojen bir ışık dağılımı elde etmek için LCD Arkaışık Modülünün içinde Dağıtıcı tabaka, Dağıtıcı filmler ve Parlaklık Arttırıcı Film (Brightness Enhancement Film – BEF) kullanılır. Ancak modülün en üstünde kullanılan dağıtıcı film, ışığı dağıtmanın ve BEF’i korumanın yanında Moire Etkisini önlemek için de kullanılabilir. Bu çalışmada, bahsi geçen bu son dağıtıcı filmin Moire etkisinin yokedilmesi konusundaki rolü incelendi.Conference Object Tam Optik Anahtarlama için Faz Analizi(IEEE, 2006) Dinleyici, Mehmet Salih; Akın, OsmanIn this work we investigate an all-optical switching node that can be controlled by means of a transient grating, which is formed by interference of two Gaussian beams. This design considers phase effect in the reflection of light from transient grating, real profile of Gaussian beams and fast switching time requirements. Four Wave Mixing (FWM) technique is applied in the evanescent field region of waveguide, showing ?(3) nonlinearity. The formed grating is analysed by standart methods to obtain the phase of diffracted light and reflection coefficients to find the power exchange between reflection orders. © 2006 IEEE.Article Citation - WoS: 7Citation - Scopus: 7Demonstration of Pulse Controlled All-Optical Switch/Modulator(The Optical Society, 2014) Akın, Osman; Dinleyici, Mehmet SalihAn all-optical pulse controlled switch/modulator based on evanescent coupling between a polymer slab waveguide and a single mode fiber is demonstrated. Very fast all-optical modulation/switching is achieved via Kerr effect of the nonlinear polymer placed in the evanescent region of the optical fiber. Local refractive index perturbation (δn = -1.45612 × 10 -5) on the thin film leads to 0.374 nW power modulation at the fiber output, which results in a switching efficiency of ≈1.5%.Article Citation - WoS: 7Citation - Scopus: 8An All-Optical Switching Based on Resonance Breaking With a Transient Grating(Institute of Electrical and Electronics Engineers Inc., 2010) Akın, Osman; Dinleyici, Mehmet SalihA 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.Conference Object In Fiber Resonance Breaking Mechanism(Institute of Electrical and Electronics Engineers Inc., 2010) Akın, Osman; Dinleyici, Mehmet SalihIn this work we investigate mode resonance breaking mechanism in slab waveguide accomplished by cladding index modulation according to Kerr nonlinearity. The interaction is considered to be a Four Wave Mixing Process and Coupled Mode Theory is used to analyze the effect of cladding perturbation into propagating fundamental mode.