Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
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.

Abstrak :
ABSTRAK
In transmission system, the information to be transmitted from one source to several addressed receivers requires a component to distribute the information. To achieve an efficient and simple distribution circuit of information, a study on the use of fiber as information signal distributor without using other optical elements has been developed as a fiber star-coupler. The optical fiber star-coupler was constructed by chemically processing the end face of fiber into a cone-shaped. The process was carried out by chemical treatment for unjacketed fibers using HF solution.

The optical signal distributed to the outgoing fibers will have as higher intensity as the nearer the fiber to the optical axis.

An efficient fiber star-coupler can be achieved by arranging the optimum number of receiving fibers correspond to coupling distance and numerical aperture of the optical fibers.

Abstrak :
In signal transmission through an optical fiber, a bending fiber causes degradation of efficiency. Due to mode conversion and radiation loss. Considering a light power radiated from a bending fiber has a possibility to be utilized as detectable signal, it is proposed an optical tap by using bending fiber. The study is devoted to design and construction of optical tap for fiber link, without any other optical element. The signal quality of the radiated light from optical fiber bending has been investigated in various angle of detection and in various radius of curvature. The result shows that the radiated signal has similar shapes of distribution of 20 degrees. And the bending loss increases if the radius of curvature decreases. A trial of sending optical signal from one end of the fiber link shows a detected radiated signal from the bending point. It is predicted that the bending fiber can be applied as optical tap, instead of a source of power loss.

Abstrak :
Serat optik merupakan salah satu media transmisi guided yang banyak digunakan pada saat ini karena memiliki berbagai macam kelebihan, antara lain memiliki tingkat keamanan data yang tinggi, memiliki rentang hidup yang panjang dibandingkan dengan media transmisi komunikasi lainnya, dan dapat membawa informasi dalam kapasitas yang besar. Namun, sebagai salah satu media transmisi, serat optik juga mengalami rugi-rugi saat mentransmisikan informasi, terlebih dalam rugi transmisi daya. Salah satu rugi-rugi yang menjadi perhatian adalah rugi macro bend pada serat optik. Penelitian ini akan meninjau seberapa besar pengaruh lengkungan serat optik terhadap transmisi daya menggunakan Optical Light Source (OLS) dan Optical Power Meter (OPM) dengan memvariasikan lekukan pada serat optik, variasi panjang gelombang pada Optical Light Source, serta variasi jenis serat optik yang digunakan, yaitu insensitive/sensitive bend fiber. Hasil yang diperoleh menunjukkan bahwa jenis kabel G652 mencapai bending loss sebesar -43.7 dB/unit pada dua lilitan dengan radius bending 0,5 cm, sedangkan jenis kabel G657 mencapai bending loss sebesar -50 dB/unit pada tiga lilitan dengan radius bending 0,5 cm. Bending loss mencapai hasil yang signifikan pada radius bending di bawah 3 cm. Rugi-rugi lengkungan pada serat optik dipengaruhi oleh jenis kabel pada serat optik, panjang gelombang pada sumber optik, jumlah lilitan dan radius bending, dengan faktor rugi-rugi yang paling signifikan dipengaruhi oleh radius bending. ......Optical fiber is one of the guided transmission media that is widely used today because it has various advantages, including having a high level of data security, having a long life span compared to other communication transmission media, and being able to carry information in a large capacity. However, as a transmission medium, optical fiber also suffers losses when transmitting information, especially in power transmission losses. One of the losses of concern is the macro bend loss in optical fiber. This study will discuss how much influence optical fiber has on power transmission using Optical Light Source (OLS) and Optical Power Meter (OPM) by varying the optical fiber, length variations on Optical Light Source, and optical variations used, namely insensitive/sensitive bend. fiber. The results obtained indicate that the G652 cable type achieves a bending loss of -43.7 dB/unit in two turns with a bending radius of 0.5 cm, while the G657 cable type achieves a bending loss of -50 dB/unit in three turns with a bending radius of 0.5. cm. Bending loss achieves significant results at bending radii below 3 cm. Bending loss in optical fiber is influenced by the type of cable in the optical fiber, the wavelength of the optical source, the number of turns, and the bending radius, with the most significant loss factor being influenced by the bending radius.

Abstrak :
Pemodelan pelengkungan mikro dan makro pada serat optik dengan satu inti homogen dipresentasikan pada penelitian ini. Rugi-rugi dari pelengkungan mikro dan makro dihitung dengan mengekpresikan medan diluar serat optik. Kemu- dian didapatkan dua kasus khusus untuk memungkinkan perhitungan koeffsien amplitudo secara analitik dan dibuat hasil plot dari persamaan tersebut. Nilai pelengkungan mikro dan makro dari serat optik dan sistem koordinat helic yang telah didapatkan dapat diaplikasikan pada kasus sebenarnya menggunakan pemrograman numerik.

Abstrak :
Beragamnya layanan informasi semakin menuntut kehandalan jaringan yang memadai, dan persaingan antar penyedia jasa layanan di dunia telekomunikasi saat ini semakin ketat. Sehingga setiap penyedia jasa layanan harus meningkatkan kinerja pelayanannya dan dituntut untuk mampu memanfaatkan teknologi agar biaya operasional perusahaan dapat ditekan. Oleh sebab itu, PT.Telkom Indonesia,Tbk sebagai salah satu penyedia jasa layanan telekomunikasi di Indonesia telah merumuskan beberapa kebijakan, salah satunya adalah merencanakan pembangunan jaringan serat optik DWDM yang menghubungkan Jakarta dengan Banten. Pada skripsi ini, akan dilakukan perencanaan jaringan serat optik DWDM (Dense Wavelength Division Multiplexing) link Jakarta?Banten, dengan melihat dari kecenderungan pertumbuhan kebutuhan bandwidth terhadap jumlah pelanggan pada layanan Metro-E, diprediksikan kebutuhan bandwidth pada triwulan III tahun 2011 adalah 26,08 Gbps hingga triwulan IV tahun 2014 adalah 69,59 Gbps. Dengan kapasitas bandwidth 70Gbps dan kehandalan margin sistem sebesar 3 dB yang mampu mengkompensasi penambahan redaman pada optik. Perhitungan power link budget dan rise time budget digunakan untuk menentukan apakah perencanaan yang dilakukan sudah memenuhi kriteria untuk diimplementasikan di lapangan. Hasil yang didapat dalam proses perhitungan menunjukkan bahwa perencanaan ini telah memenuhi kriteria untuk diimplementasikan di lapangan. Hal ini dibuktikan dengan menggunakan 1 buah penguat, power link budget dapat menjangkau jarak tempuh transmisi sejauh 192 km, sedangkan jarak tempuh link Jakarta-Banten sejauh 153,66 km. Nilai rise time jalur perencanaan yang melebihi nilai rise time sistem akan terkompensasi setelah ditambahkan DCM pada jalur tersebut, dimana nilai rise time budget sistem sebesar 70 ps.

---

Diversity of information services are increasingly demanding an adequate network reliability, and competition among providers of telecommunications services currently was increasingly stringent. So that, every operator must to increase their service and able to using technology to decrease operational cost company. Therefore, PT.Telkom Indonesia, Tbk on behalf of telecommunication operator in Indonesia have policy, one of the policy are building plan of DWDM optical fiber network for link Jakarta - Banten. This thesis describes planning of DWDM (Dense Wavelength Division Multiplexing) network fiber optic link Jakarta?Banten. From the trend growth of bandwidth requirements and the number of subscribers predicted that bandwidth requirements in the third quarter of 2011 is 26,08 Gbps and in the fourth quarter of 2014 is 69,59 Gbps. With the capacity of bandwidth is 70Gbps and reability of margin system is 3 dB that capable to compensate the attenuation in optical. Calculation power link budget and rise time budget used to determine whether the planning are appropriate to implemented. The result of calculation showed that this planning is appropriate to implemented. It proved by using 1 optical amplifier, power link budget can reach 192 kilometers of transmission distance, whereas the distance of Jakarta?Banten is 153,66 kilometers. Value of rise time budget planning which higher than rise time budget system will be compensated after adding DCM on that sublink, whereas value of rise time budget system is 70 ps.