Browsing by Author "Oran, A."

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    Article
    Performance Analysis of Photonic Lantern Based Coherent Receivers
    (Natl Inst Optoelectronics, 2018) Oran, A.; Ozdur, I.; 01. Abdullah Gül University; 03.01. İşletme; 03. Yönetim Bilimleri Fakültesi
    In this paper, we present the simulation results for bit-error-rate improvements of photonic lantern based coherent LIDAR systems. Our results show that using a 19-port photonic lantern, the bit-error-rate can be improved to 0.06 from 0.30 for a range of 100 meters, corresponds to a detection rate improvement from 70% to 94%.
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    Conference Object
    Citation - Scopus: 1
    Three-Dimensional Imaging in Degraded Visual Field
    (IOP Publishing Ltd, 2016) Oran, A.; Ozharar, S.; Ozdur, I.; 01. Abdullah Gül University; 03.01. İşletme; 03. Yönetim Bilimleri Fakültesi
    Imaging at degraded visual environments is one of the biggest challenges in today's imaging technologies. Especially military and commercial rotary wing aviation is suffering from impaired visual field in sandy, dusty, marine and snowy environments. For example during landing the rotor churns up the particles and creates dense clouds of highly scattering medium, which limits the vision of the pilot and may result in an uncontrolled landing. The vision in such environments is limited because of the high ratio of scattered photons over the ballistic photons which have the image information. We propose to use optical spatial filtering (OSF) method in order to eliminate the scattered photons and only collect the ballistic photons at the receiver. OSF is widely used in microscopy, to the best of our knowledge this will be the first application of OSF for macroscopic imaging. Our experimental results show that most of the scattered photons are eliminated using the spatial filtering in a highly scattering impaired visual field. The results are compared with a standard broad area photo detector which shows the effectiveness of spatial filtering.