Hasil Pencarian  ::  Simpan CSV :: Kembali

"Development of optical fiber communication system is mainly due to the progressive influence of optical source. Laser diode as optical source in optical transmission system is of great attention because laser diode produces coherent monochromatic-light. Furthermore, laser diode has a high quantum efficiency, can be modulated at a very high speed, has small size and compact. The application of such optical source is also wide, ranging from optical signal communication to radar optics. Therefore, laser diode is considered to be a key component in optoelectronic system. In this study, an experimental model of analog optical transmission system with laser diode as optical source at wavelength of 0.79 pm has been designed and constructed. The design and construction include optical and electronic circuits. Design description at the wavelength used in this study is briefly described. The characteristics of the system was evaluated by measuring the frequency responds of photo detector, the transmission bandwidth and the loss of the system. The result shows that the frequency responds of the photo detector limits the transmission bandwidth of the whole system. On the other hand, by the use of the selfoc lens for coupling laser diode to fiber line, a coupling efficiency as high Es 55 % has been achieved. Based on the evaluation on the result obtained for the experimental model the practical applicability of the system is pointed out."

"In this research work an experiment on the application of fiber sensor for measuring an acoustic vibration has been carried out. A light beam from He-Ne laser source was into two arms of Mach tender Interferometer. Each arm of the interferometer was a piece of optical fiber with a length of 2 m.The beam transmitting through the sensing arm was modulated in phase by an acoustic vibration produced by a signal generator. The output of this fiber was interfered with the light radiated from the undisturbed fiber, the reference arm of the interferometer. A fringe counter measured a fringe shift due to the vibration of the acoustic signal. The measurement shows a good response in terms of the number of fringes with respects to the acoustic vibration in a frequency range of 10 Hz up to 40 Hz. It is concluded that the system is applicable to measure an acoustic vibration with an accuracy of 7 %."

"Kebutuhan pada jaringan komunikasi dengan kecepatan dan kapasitas yang tinggi terus meningkat seiring dengan berkembangnya teknologi informasi dan komunikasi. Teknologi 5G yang diterapkan pada Radio over Fiber yang disertai Wavelength Division Multiplexing dapat memenuhi kebutuhan tersebut. Dilakukan penelitian untuk mengetahui faktor-faktor yang berpengaruh terhadap transmisi Radio over Fiber yang melingkupi data rate, panjang kabel fiber optik, dan frekuensi radio. Dengan mengetahui pengaruh dari faktor-faktor tersebut, dilakukan perancangan skema fronthaul berbasis fiber optik yang mendukung aplikasi 5G. Hasil penelitian menunjukkan peningkatan data rate menghasilkan peningkatan kemungkinan terjadinya inter-symbol interference (ISI) dan peningkatan frekuensi radio meningkatkan kapasitas sebelum akhirnya mengalami saturasi pada frekuensi 40 Ghz, sedangkan panjang kabel fiber optik tidak memberikan pengaruh yang signifikan. Perancangan skema fronthaul dilakukan dengan frekuensi radio 26 GHz yang disertai penggunaan WDM, optical amplifier, dan dispersion compensating fiber (DCF). Simulasi pada skema upstream dan downstream yang dilakukan menunjukkan bahwa rancangan telah memenuhi target spesifikasi yang ditetapkan ITU dengan Q factor lebih besar dari 6 dan BER lebih kecil dari 10-9 pada setiap kanal. Penelitian dapat dikembangkan dengan menggunakan frekuensi radio yang tinggi dengan data rate yang lebih besar dan jangkauan kabel fiber optik yang lebih jauh.

---

The demand for high-speed and high-capacity communication networks continues to increase along with the advancement of information and communication technology. 5G technology applied to Radio over Fiber accompanied by Wavelength Division Multiplexing (WDM) can meet these needs. A study was conducted to identify the factors affecting Radio over Fiber transmission, which include data rate, fiber optic cable length, and radio frequency. By understanding the impact of these factors, a fiber optic-based fronthaul scheme supporting 5G applications was designed. The study results show that increasing the data rate leads to a higher likelihood of inter-symbol interference (ISI), and increasing the radio frequency enhances capacity until it saturates at 40 GHz, while the fiber optic cable length does not have a significant impact. The fronthaul scheme was designed using a 26 GHz radio frequency, accompanied by WDM, optical amplifiers, and dispersion compensating fiber (DCF). Simulations of the upstream and downstream schemes demonstrated that the design meets the ITU's target specifications with a Q factor greater than 6 and a BER less than 10^-9 for each channel. The research can be further developed by utilizing higher radio frequencies with higher data rates and longer fiber optic cable reach."

"ABSTRACT As transmission medium in optical communication system, optical fiber is also characterized by elastic properties beside of transmission properties of optical fiber. The Young Modulus of Elasticity of optical fiber could be measured by considering a bare optical fiber as cantilever which resonant with an acoustical vibration. To detect the cantilever vibration, a HeNe laser light is launched into the cantilever of optical fiber through its free end and the output laser light is detected by a PMT and observed by the channel 2 of an oscilloscope. Channel 1 of the oscilloscope observes the signal of the acoustical vibration. Regulating both the frequency and amplitude of the vibration or the position of the pinhole of the PMT, the resonance frequency of the cantilever could be detected accurately. Using the data of the resonance frequencies of various length of the cantilever has been calculated. "

"The 4th edition of this popular Handbook continues to provide an easy-to-use guide to the many exciting new developments in the field of optical fiber data communications. With 90% new content, this edition contains all new material describing the transformation of the modern data communications network, both within the data center and over extended distances between data centers, along with best practices for the design of highly virtualized, converged, energy efficient, secure, and flattened network infrastructures.Key topics include networks for cloud computing, software defined networking, integrated and embedded networking appliances, and low latency networks for financial trading or other time-sensitive applications. Network architectures from the leading vendors are outlined (including Smart Analytic Solutions, Qfabric, FabricPath, and Exadata) as well as the latest revisions to industry standards for interoperable networks, including lossless ethernet, 16G Fiber Channel, RoCE, FCoE, TRILL, IEEE 802.1Qbg, and more."

"In particular we concentrate on mayor current implementations of optical fiber communications system which employ some form of intensity modulation (1M) of optical source, together with simple direct detection (DD) of the modulated optical signal at receiver- Good receiver where x is 0,3 (factor x ranges between 0 and 1.0 depending on the photo diode material }and SNR excess of 70 dB, is for 25 km transmission distance. The deployment optical amplifiers, particularly on long IM/DD optical fiber 'ink with RFR (flouride glass fiber in excess of 30 dB, and the Raman shift of 6097:6 cm i ) can be represented by an increase of 3.4 dB/km for the power level of 0 dBm and the signal input of 6097.6 cm-1."

"Teknologi mengalami banyak perkembangan dalam 10 tahun terakhir ini salah satunya adalah dalam bidang telekomunikasi. Kebutuhan ini mendorong lahirnya 5G yang diharapkan dapat mendukung Massive Machine Type Communication (mMTC), Enhanced Mobile Broadband (eMBB), dan Ultra-Reliable and Low Latency Communication (uRLLC). Dalam mendukung aplikasi ini dibutuhkan kecepatan pengiriman data yang tinggi terutama pada jaringan fronthaul untuk mendukung akses radio ke pengguna. Gelombang milimeter (mmWave) dapat mengakomodasi radio dengan kecepatan tinggi dan latensi yang rendah sehingga dapat digunakan untuk aplikasi fronthaul 5G di daerah padat penduduk. Penelitian ini merancang sistem Wavelength Division Multiplexing (WDM) Radio over Fiber (RoF) berbasis gelombang milimeter dan melakukan optimasi sistem dengan fiber bragg grating (FBG). Hasil penelitian menunjukkan rancangan sistem WDM-Radio over Fiber telah memenuhi standar untuk skema downstream pada jarak 20 km dengan peak bit rate 20 Gbps, sedangkan skema upstream dengan peak bit rate 10 Gbps. Rancangan sistem WDM Radio over Fiber berbasis gelombang milimeter tersebut berhasil dicapai karena adanya pengaruh dari penambahan Fiber Bragg Grating (FBG) dan Semiconductor Optical Amplifier (SOA). SNR rangkaian final mengalami penurunan sebesar 5,55% untuk downstream dan 4,4% untuk upstream akibat penambahan komponen seperti penguat sinyal dan kompensator pada rangkaian.

---

Technology has undergone many developments in the past 10 years, one of which is in the field of telecommunications. This need has driven the emergence of 5G, which is expected to support Massive Machine Type Communication (mMTC), Enhanced Mobile Broadband (eMBB), and Ultra-Reliable and Low Latency Communication (uRLLC). Supporting these applications requires high-speed data delivery, especially in fronthaul networks to support radio access to users. Millimeter waves (mmWave) are capable of providing high-speed radio transmission with low latency, making them suitable for 5G fronthaul applications in densely populated areas. This research designs a Wavelength Division Multiplexing (WDM) Radio over Fiber (RoF) system based on millimeter waves and optimizes the system with fiber Bragg grating (FBG). The research results show that the WDM-Radio over Fiber system design has met the standards for downstream schemes at a distance of 20 km with a peak bit rate of 20 Gbps, while the upstream scheme with a peak bit rate of 10 Gbps. The WDM Radio over Fiber system design based on millimeter waves was successfully achieved due to the influence of the addition of Fiber Bragg Grating (FBG) and Semiconductor Optical Amplifier (SOA). The SNR of the final circuit decreased by 5.55% for downstream and 4.4% for upstream due to the addition of components such as signal amplifiers and compensators in the design."