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Abstrak :
Penggunaan teknologi serat optik berkembang dengan pesat. Salah satu sistem yang memanfaatkan penggunaan serat optik adalan jaringan lokal akses fiber (Jarlokaf), DLC (Digital Loop Carrier) adalah salah satu jenis teknologi jarlokaf. Apabila suatu sistem DLC gagal (fail) maka akan berakibat hilangnya pemasukan bagi penyelenggara jasa telekomunikasi, kehi1angan pemasukan ini dapat mengakibatkan kerugian yang besar. Probabilitas kegagalan suatu sistem DLC dapat diperkirakan secara kuantitatif dengan menggunakan metoda Reliability Engineering. Reliabilitas dapat diartikan sebagai suatu ukuran frekuensi kegagalan alat dalam fimgsi waktu. Reliabilitas akan mempengaruhi biaya perawatan dan kesinambungan perbaikan. Prediksi reliabilitas yang dilakukan dalam penelitian ini adalah untuk membantu memutuskan jenis pro duk dalam penmilihan sistem DLC. Pada penelitian ini akan dilakukan penentuan fungsi reliabilitas sistem DLC serta mean time between failure (MTBF)-nya sebagai fungsi berbagai jumlah unit komponen cadangan. Sistem DLC yang dianalisis adalah merupakan hasil disain untuk memenuhi kebutuhan wilayah Cengkareug-Jakarta. Selanjutnya dari konfigurasi lengkap tersebut dibuat model reliabilitasnya dengan metoda tertentu. Tabel keadaan dapat dibuat dari hasil model reliabilitas tersebut, kemudian analisis secara rinci dapat dilakukan dengan memanfaatkan tabel keadaan sehingga didapatkan fungsi reliabilitas dan nilai MTBF sistem DLC: yang diamati.

Abstrak :
ABSTRACT
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.

Abstrak :
ABSTRACT
The combination of the coupled mode and normal mode theories has been used to formulaic the theoretical performance represented by the coupling length and crosstalk parameters of the X-cut APE-LN SDC fabricated using the benzoic acid as the proton source, where in this case the matrix effective refractive index (MERI) method is applied for solving the symmetric and antisymmetric propagation constants of the normal modes propagating in this device. The corresponding near field method has been used to experimentally determine its crosstalk.

The actual performance of this device is characterized by comparing the theoretically calculated with the experimentally determined crosstalk parameters. A software computer program has been developed in order to numerically characterize the entire characteristic and performance of the SDC under study.

For the SDC under study, the best crosstalk obtained at the operating wavelength lamda =1.3 micrometer is ~0.21 dB for the interaction length L = 6 mm and the gap separation g = 5 mm. Its coupling length is ~ 1.33 mm. The propagation constant of the corresponding individual single-mode X-cut APE-LN channel waveguide making up this SDC is beta = 10.37901 micrometer, and thereby its effective refractive index is N cπ= 2.14743330.

It has been shown that the fabricated SDC is very lossy. It has been deduced that its bad performance predominantly caused by the side diffusion effect, corresponding to the fabrication problem, where in this case the substrate sample has been not coated first with the buffer layer when the deposition of substrate sample with the aluminum mask was to be performed in the fabrication stages.

Moreover, in this case only the simple annealing has been performed. The successive annealing process in order to reduce the coupling loss has been not applied yet. Under the assumption that the fabrication tolerances are such that the practical devices with coupling loss below 0.25 dB are feasible, the fabricated SDC under study is a 3 dB coupler.