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Article
Novel Optical Fiber Sensor Based on SGMS Fiber Structure for Measuring Refractive Index of Liquids and Gases

Author: J.K. Hmood
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2011 Volume: 7 Issue: 4 Pages: 17-21
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this paper a single mode-gap-multimode-single mode fiber structure (SGMS) as refractive index sensor is demonstrated. A beam propagation method (BPM) for the circular symmetry waveguide is employed for numerical simulations of the light propagation performance in such fiber devices. The multimode interference effect is revealed to design optical fiber sensor with reasonable linearity in wide range of refractive indices. A simple way to predict and analyze the spectral response of the SGMS structure is presented with the derived approximated formulations. The proposed sensor is realized by using standard optical fibers.Results indicate that the proposed SGMS structure can be exploited for measuring a broad refractive index range with reasonable high resolution. The results achieved for refractive indices in the range of 1.1 to 1.43 have best linearity with correlation coefficient 0.9991 at wavelength of 1550 nm. Therefore, it can be suggested that the SGMS structure fibers are attractive for measuring refractive index of both gases and aqueous solutions such as chemical liquids, biological, and biochemical sensing.


Article
New Design of Optical Filters Based on Single Mode-Multimode-Single Mode Fiber Structure for Optical Fiber Communication Systems

Author: Jassim Kadim Hmood
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 15 Pages: 3172-3184
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this paper, a design of optical filters based on single mode-multimode-single mode fiber structure (SMS) is demonstrated. The multimode interference effect can be utilized to design wavelength-selective devices with high extinction ratio. The proposed optical filters are realized by using standard optical fibers.Two optical filters are designed to operate with wave division multiplexing (WDM) communication system in two channels at wavelength of 1310 nm and 1550 nm. First filter has power transmission of -0.253/-35 dBm at wavelengths of 1310/1550 nm respectively while, second one has power transmission of -32 / -1.35 dBm at wavelengths of 1310 /1550 nm respectively. In addition, power transmissioncurves, spectral response curves, and propagation field of SMS structure in two and three dimensions are plotted.


Article
Simulation & Evaluation of (OADM) Based on Bragg Gratings and 3dB MMI Couplers
محاكاة وتقييم لـ(OADM)المبني على اساس محززات براغ ووصلات التداخل المتعدد ( 3 دسيبل)

Authors: Aied K. Mohammed --- Raheel J. Hassoon
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2015 Volume: 33 Issue: 2 Part (A) Engineering Pages: 400-414
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this paper, an approach has been proposed to design an (OADM) made in silica- on silicon waveguide by combining Bragg gratings (BGs) and 2x2 3dB multimode interference couplers (3dB MMI coupler) in a Mach-Zehnder interferometer. This design technique shows an interesting result to obtain low insertion loss, low return loss, insensitive to polarization, high thermal stability, large optical bandwidth and low crosstalk.

في هذا البحث تم عمل تصميم جديد لـ(OADM) من مادة السلكا فوق دليل موجي من السلكون من خلال الجمع بين محززات الحيود لبراغ (BG) ووصلات التداخل المتعدد من نوع (2x2 3dB MMI coupler ) في تداخل ماخ زيندر . يظهر هذا التصميم نتيجة مثيرة للاهتمام من خلال الحصول على فقدان إدراج منخفض ، وانخفاض خسارة العودة، وعدم التأثر بالاستقطاب وله استقرارية حرارية عالية، وعرض نطاق ترددي ضوئي كبير وكذلك قليل في انتقال المعلومات من قناة الى اخرى .

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