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Article
Fabrication and Characterization of Dye-doped Polymer Optical Fiber
تصنيع ودراسة الخصائص الليف البصري البلاستيكي المطعم بالصبغة

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Abstract

This paper is concerned with the design a special perform drawing system for fabricated Step Index-Single Mode Polymer Optical Fiber (SI-SM POF). The POF has been fabricated by this device based on a highly crosslinked poly methyl methacrylate (PMMA) as a core material and a dye-doped PMMA cladding layer. The refractive indices of the core material and the cladding are 1.49 and 1.35, respectively. The physical and optical properties of POF have been studied, which fabricated at different diameters. Laser light (633 nm) was coupled in to the POF using standard prism coupling techniques. From the morphological analysis of the POF it has been shown that the homogenous and the viscidity of the core and cladding is suitable. In additional to the core is completely in the center of the POF.

يهتم هذا البحث بتصميم وتصنيع بطريقة خاصة لمنظومة سحب التشكيل لليف البصري البلاستيكي ثابتة معامل الانكسار ذات نمط منفرد وهذا اليف البصري المصنع بشكل مترابط اساسا مادة القلب من بوليمر مثيل ميثا اكريلايت ومادة القشرة من صبغة الرودامين 6G المطعمة باللبوليمر. معاملات الانكسار لمادتي القلب والقشرة كانت1.49 ,1.35 على التوالي. تم دراسة الخصائص الفيزيائية والبصرية للالياف البصرية المحضرة وباقطار مختلفة. استخدم الليزر ذو الطول الموجي 633 nm في عملية الاقتران بواسطة تقنية اقتران الموشور. ومن خلال دراسة الشكل المظهري للالياف لوحظ ان التجانس واللزوجة بين القلب والقشرة كانت مثالية اضافة الى ان موقع القلب كان تماما في مركز الليف البصري البلاستيكي.


Article
Numerical Analysis of Thermal Dependence of the Spectral Response of Polymer Optical Fiber Bragg Gratings

Author: Hisham K. Hisham
Journal: Iraqi Journal for Electrical And Electronic Engineering المجلة العراقية للهندسة الكهربائية والالكترونية ISSN: 18145892 Year: 2016 Volume: 12 Issue: 1 Pages: 85-95
Publisher: Basrah University جامعة البصرة

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Abstract

The thermal dependence of the spectral response (i.e. transmission, reflection and time delay (τr) responses) ofuniform polymer optical fiber (POF) Bragg gratings has been investigated. In addition to the temperaturedependence, the effects of grating strength (kLg) and fiber index modulation (∆n) have been investigated. Besideshigh capability of tunable wavelength due to the unique large and negative thermo-optic coefficient of POF, thespectral response for POF Bragg gratings show high stability and larger spectrum bandwidth with temperaturevariation compare with the silica optical fiber (SOF) Bragg gratings, especially with the increase of the kLg value. Itwas found that by increasing kLg, the peak reflectance value increases and the bandwidth of the Bragg reflectorbecome narrower. Also it’s shown by increasing the kLg value, τr deceasing significantly and reach its minimumvalue at the designed wavelength (λB). Furthermore, the τr for POF Bragg gratings is less than that for SOF Bragggratings at the same value of kLg. Also it’s found that the peak reflectivity value increases to around 60% when the∆n value increases from 1ˣ10-4 to 5ˣ10-4.


Article
Effect of Temperature Variations on Strain Response of Polymer Bragg Grating Optical Fibers

Author: Hisham K. Hisham
Journal: Iraqi Journal for Electrical And Electronic Engineering المجلة العراقية للهندسة الكهربائية والالكترونية ISSN: 18145892 Year: 2017 Volume: 13 Issue: 1 Pages: 53-58
Publisher: Basrah University جامعة البصرة

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Abstract

This paper presents a numerical analysis for the effect of temperature variations on the strain response of polymer optical fiber (POF) Bragg gratings. Results show that the dependence of the Bragg wavelength (λB) upon strain and temperature variations for the POF Bragg gratings is lies within the range of 0.462 – 0.470 fm με-1 °C-1 compare with 0.14 – 0.15 fm με-1 °C-1 for the SOFs Bragg gratings. Also, results show that the strain response for the POF Bragg gratings changed on average by 1.034 ± 0.02fm με-1°C-1 and on average by 0.36 ± 0.03fm με-1°C-1 for the silica optical fiber (SOF) Bragg gratings. The obtained results are very important for strain sensor applications especially in the environments where the temperature change.

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