Articles
<![CDATA[Analisa Kinerja Teknik Modulasi Digital pada Kanal Optik Nirkabel ]]>
<![CDATA[Astharini, Dwi]]>;
<![CDATA[Mayola, Ary]]>;
<![CDATA[Samijayani, Octarina Nur]]>;
<![CDATA[Syahriar, Ary]]>
<![CDATA[ Jurnal Elektronika dan Telekomunikasi Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Indonesian Institute of Sciences ]]>
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DOI: 10.14203/jet.v17.7-12
<![CDATA[Transmisi optik nirkabel dengan kecepatan tinggi memiliki berbagai potensi untuk aplikasi jarak pendek terutama untuk komunikasi di dalam ruangan. Tulisan ini memaparkan perbandingan kinerja transmisi FSO menggunakan beberapa variasi skema modulasi. Pengamatan unjuk kinerja terutama dilakukan menggunakan bit error rate (BER). Gangguan turbulensi atmorferik menjadi bagian dari pemodelan kanal log normal yang digunakan dalam simulasi. Modulasi dasar spasial yang digunakan adalah on-off keying sebagai teknik klasik FSO, beserta pulse position modulation yang merupakan variasi spasialnya. Menelaah penggunaan modulasi baseband untuk sistem optik, disimulasikan PSK 2, 4, 8, 16, serta QAM 4 dan 16. Simulasi dengan data ukuran kecil menghasilkan bahwa BPSK dan 4 QAM menunjukkan unjuk kerja terbaik dengan BER rata-rata sekitar 10^-3 pada kondisi gangguan sedang sampai tinggi. Sementara tingkat error pada OOK dan PPM masih di atas 10^-0.5.]]>
<![CDATA[KARAKTERISTIK DIREKSIONAL KOPLER MENGGUNAKAN TEORI MODA TERGANDENG DAN METHOD OF LINES ]]>
<![CDATA[Syahriar, ary]]>;
<![CDATA[Adam, Helmi]]>
<![CDATA[ Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 3 (2006) ]]>
Publisher : <![CDATA[Badan Pengkajian dan Penerapan Teknologi ]]>
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DOI: 10.29122/jsti.v8i3.760
<![CDATA[Single mode directional couplers are key components in many optical communication and sensor applications, including optical power splitting, optical filtering, optical reflecting, wavelength multiplexing/demultiplexing, and optical polarisation splitting. The general basic principle in most directional coupler is that under appropriate conditions light transfer can occur between the two adjacent fiber cores via a mechanism called evanescent wave coupling. When the two cores are put closely together the evanescent field travelling from the throughput fiber reaches the coupled waveguide and excite a mode in it. In this paper we use two approaches in analyzing the properties of directional couplers, namely the coupled mode thery and the method of lines. it is found that the two methods agree very well.]]>
<![CDATA[PERAN TEKNOLOGI INFORMASI DALAM PENGENTASAN KEMISKINAN DI INDONESIA ]]>
<![CDATA[Syahriar, Rizky Qinthara]]>;
<![CDATA[syahriar, ary]]>
<![CDATA[ Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 3 (2006) ]]>
Publisher : <![CDATA[Badan Pengkajian dan Penerapan Teknologi ]]>
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DOI: 10.29122/jsti.v8i3.762
<![CDATA[A preliminary research on the roles of information can communication technology for poverty alleviation has been done. The research based on analysis of secondary data on ICT access and poverty data during the year 200-2006. It was found that there exist paradoxes where ICT infrastructure mainly concentrated in the capital city and other big cities but poverty mainly concentrated in rural area. These have created complex problem to solve poverty by using ICT. This paper is trying to introduce the roles of ICT and its solution in helping to reduce poverty in Indonesia.]]>
<![CDATA[DESAIN PANDU GELOMBANG PARALEL TERISOLASI DENGAN METHOD OF LINES ]]>
<![CDATA[Syahriar, ary]]>
<![CDATA[ Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 3 (2006) ]]>
Publisher : <![CDATA[Badan Pengkajian dan Penerapan Teknologi ]]>
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DOI: 10.29122/jsti.v8i3.759
<![CDATA[Optical directional couplers are fundamental building components for the design ofoptical circuits. The proper treatment of a device that couples the guided modes ofa waveguide with the radiation in free space is particularly difficult because of thecontinuum nature of the radiating modes. The desire of high-density integrationposes additional problems due to the fact that the simplest used couplingstructures need to be quite large. In order to reduce the size of the device we studynon-periodic structures based on air gap isolated directional couplers, for whichadditional degrees of freedom are available. The analysis of this type of structuresrequires a rigorous method for the solution of the field equations. We employ themethod of lines for the computation of such coupler characteristics.]]>
<![CDATA[Overdriven Characteristics of Silica Switching Devices ]]>
<![CDATA[Ary Syahriar]]>;
<![CDATA[Nabil Rayhan Syahriar]]>;
<![CDATA[Jusman Syafiie Djamal]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 4: December 2017 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v15i4.6457
<![CDATA[We have built and characterized silica on silicon switching devices fabricated by using the electron beam irradiation. It is based on Mach-Zehnder structure fabricated on silica on silicon layers where the upper cladding used the MgF2 layers to bury the core. The switching speed of 2.0 s has been achieved. To further increase the switching speed we have used larger voltage to the Ti heating electrode to increase the thermo optics effects on silica structures. The higher driving voltage have been used that falls to zero exactly as the first extinction is reached, therefore three fold increase in modulation speed is achieved.]]>
<![CDATA[Cladding effects on silica directional couplers ]]>
<![CDATA[Ary Syahriar]]>;
<![CDATA[Ahmad Husin Lubis]]>;
<![CDATA[Jusman Syafii Jamal]]>;
<![CDATA[Anwar Mujadin]]>;
<![CDATA[Ahmad Juang Pratama]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 3: June 2019 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v17i3.8705
<![CDATA[Directional couplers are widely used as passive and active optical devices in fibre and integrated optics, and form the basis of components such as switches, modulators and wavelength filters. They consist of two closely-spaced parallel waveguides, whose separation is sufficiently small that power may be transferred between the modes propagating in the two guides through an interaction involving their evanescent fields. In this paper results are presented for a range of near infrared single mode silica directional couplers fabricated by electron beam irradiation. The effects of over cladding layers will be highlighted. Changes on coupling coefficient due to different cladding refractive indexes will also be examined. The coupled mode theory will be employed to fit the experimental results with prediction by theory. It is found that over cladding layer alters the transmission characteristics of silica directional couplers.]]>
<![CDATA[Comparison of semiconductor lasers at wavelength 980 nm & 1480 nm using InGaAs for EDFA pumping scheme ]]>
<![CDATA[Satyo Pradana]]>;
<![CDATA[Ary Syahriar]]>;
<![CDATA[Sasono Rahardjo]]>;
<![CDATA[Ahmad H. Lubis]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 5: October 2019 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v17i5.11745
<![CDATA[Long distance Optical Communications are affected by many problems; loss of signal is one of them. Erbium Doped Fiber Amplifier (EDFA) is the key to solve it. By using Semiconductor Laser as pumping source for EDFA, the signal can brought back the performed of EDFA into normal condition. EDFA has a good wavelength operation at 980nm & 1480nm, in that case Semiconductor Laser using InGaAs at 980nm & 1480nm is suitable for them. By using selected wavelength and materials, the Semiconductor Laser can be produced properly. Also, determining the parameter is the important things to construct the Laser. By using Rate Equation, the performed of Semiconductor Laser can obtained several result. Those are injection current as a function of voltage, carrier density, photon density and output power as a function of injection current.]]>
<![CDATA[Modelling Optical Waveguide Bends by the Method of Lines ]]>
<![CDATA[Ary Syahriar]]>;
<![CDATA[Nabil Rayhan Syahriar]]>;
<![CDATA[Jusman Syafiie Djamal]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 4: August 2018 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v16i4.5191
<![CDATA[A rigorous analytical and semi analytical method of lines has been used to calculate the transverse-electric field attenuation coefficient of guided mode as it travels in waveguide bends structure. Both approaches then were compared to get a better understanding on how the attenuation behaves along single curve waveguides with constant radius of curvature. The Helmholtz Equation in polar coordinate was transformed into a curvalinier coordinate to simulate the waveguide bends using the method of line analysis. The simple absorption boundary conditions are used into the method of lines to demonstrate evanescent field of the guided mode nature as its travels in waveguide bends structures. The results show that a reasonable agreement between both theoretical approaches.]]>
<![CDATA[Temperatures effects on cascaded Mach-Zehnder interferometer structures ]]>
<![CDATA[Ary Syahriar]]>;
<![CDATA[Rahmat Alamtaha]]>;
<![CDATA[Zulkifli Alamtaha]]>;
<![CDATA[Putri Wulandari]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 9, No 6: December 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v9i6.1982
<![CDATA[To increase bandwidth and number of channels per fiber for more than one wavelength in the same fiber the dense wavelength division multiplexing (DWDM) technology has been utilized. One of the devices that are important in DWDM is an optical interleaver. This paper discussed the effects of temperatures in the DWDM interleaver by using the Mach-Zehnder interferometer (MZI) structures which is arranged in two-stage cascaded MZI and the three-stage cascaded MZI geometries. The main consequences of increase temperature inside the fiber optics are the change of effective refractive index in the material of silica fiber due to the thermo-optics effects. In our analysis we have used the transfer matrix method to investigate the wavelength dependence of output power to the temperatures changes that varies from 30oC to 430ºC. In the calculation we have used the C-Band range wavelength which is around 1530 to 1565 nm. It has been shown that the change of temperatures may shift the wavelength inside the MZI output power in linear manners. These effects may be used to tune wavelength transmission inside the MZI structures to suit the ITU-T defined grid. ]]>
<![CDATA[DISAIN DIRECTIONAL 3 DB COUPLER UNTUK SISTEM KEAMANAN TRANSMISI WDM FIBER OPTIK ]]>
<![CDATA[Amri Heryana]]>;
<![CDATA[Ary Syahriar]]>
<![CDATA[ Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2011 ]]>
Publisher : <![CDATA[Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia ]]>
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<![CDATA[Teknologi WDM adalah teknologi transport untuk mengirimkan berbagai jenis file (data, suara, dan video)secara transparan, dengan menggunakan panjang gelombang (wavelength) yang berbeda-beda dalam suatufiber tunggal secara bersamaan. WDM memiliki kemampuan mentransmisikan data dalam jumlah yang besardengan kecepatan yang tinggi 2,5 – 10 Gbps dan dapat diterapkan pada jaringan jarak jauh (long haul) maupunjaringan jarak dekat (short haul). Dengan trafik yang sedemikian besar WDM sangat beresiko mengalami breakdown apabila terjadi gangguan pada jaringan akibat rusaknya fiber. Pada paper ini akan dibahas sebuahrancangan coupler yaitu directional 3dB coupler yang dapat digunakan untuk pengaman transmisi WDM.]]>
