Karya tulis mengenai sistem komunikasi satelitDeskripsi lengkap
makalahDeskripsi lengkap
Materi Dasar Sistem Komunikasi
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Full description
Sistem Komunikasi Intrapersonal
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SISTE SIS SISTEM TEM M KOMU OMUNIKAS NIKASII SE SERA SER RAT AT OP OPTI OPTIK TIK K
I. PENDAHULUAN
KOMUNIKASI adalah transfer informasi dari satu titik ke titik yang lain. Jarak, diperlukan suatu sistem.
FIBER OPTIK FIBER OPTIK Fiber Optic adalah media transmisi informasi yang terbuat dari serat kaca dan plastic yang menggunakan bias cahaya dalam mentransmisikan data sehingga memiliki kecepatan transfer data yang sangat cepat. 1.
The General System
The General Communication System
Information source
Transmitter (modulator)
Transmission Medium
Destination
Receiver (demodulator)
The General System
The Optical Fiber Communication System
Information source
Electrical Transmit
Optical Source
Optical Fiber
Destination
Receiver (demodulator)
Optical Detector
Optical Fiber Advantages 6
Weight and Size
Material Cost
Fiber cable costs significantly less than copper cable for the same transmission capacity
Information Capacity
Fiber cable is significantly smaller and lighter than electrical cables to do the same job
Recently, bit-rates of up to 14 Tbit/s have been reached over a single 160 km line using optical amplifiers
No Electrical Connection
Electrical connections have problems:
Ground loops (in a conductor connecting two points that are supposed to be at the same potential, often ground, but are actually at different potentials) causing noises and interferences Dangerous (must be protected) Lightning poses a severe hazard Jaringan Telekomunikasi
Optical Fiber Advantages (Cont) 7
No Electromagnetic Interference
Longer distances between Regenerators (hundreds of kilometers) Open Ended Capacity
Because the connection is not electrical, you can neither pick up nor create electrical interference (the major source of noise)
The maximum theoretical capacity of installed fiber is very great (almost infinite)
Better Security
It is possible to tap fiber optical cable. But it is very difficult to do and the additional loss caused by the tap is relatively easy to detect
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Optical Fiber Elements 8
Core
Carries the light signal (pure silica glass and doped with germanium)
Cladding
Keeps light signal within core (Pure Silica Glass)
Protects Optical Fiber From Abrasion and External Pressures (UV Cured Acrylate)
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Mengapa cahaya bisa bergerak sepanjang serat optik? 9
Karena ada fenomena Total Internal Reflection (TIR) TIR dimungkinkan dengan membedakan indeks bias (n)
Dalam hal ini n core > ncladding
Memanfaatkan hukum Snellius
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Remembering Snellius 10
ncore > ncladding
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11
Critical angle
At the critical angle we know that 90° = 1 and so
θ²
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equals 90° and sin
12
for rays where θ1 is less than a critical value then the ray will propagate along the fiber and will be “bound” within the fiber (Total Internal Reflection)
where the angle θ1 is greater than the critical value the ray is refracted into the cladding and will ultimately be lost outside the fiber Jaringan Telekomunikasi
Numerical Aperture (NA) 13
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Light Modes 14
Can be as few as one mode and as many as tens of thousands of modes
Used for multimode: 850 nm or 1300 nm Wide beam width fills multimode fibers Wider spectrum (typically 50 nm) Inexpensive Cannot modulate as fast as lasers
Used for multimode at 850 and 1300 nm Quite narrow spectrum Narrow beam width (does not fill multimode fibers) Much less expensive than FP or DFB lasers
Used for singlemode: 1310 nm or 1550 nm Narrow spectrum (can be less than 1 nm) Narrow beam width (does not fill multimode fibers) Highest power and fastest switching–Most expensive (especially DFB)
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17
Salah satu cara untuk mengidenifikasi konstruksi kabel optik adalah dengan menggunakan perbandingan antara diameter core dan cladding. Sebagai contoh adalah tipe kabel 62.5/125. Artinya diamater core 62,5 micron dan diameter cladding 125 micron Contoh lain tipe kabel:50/125, 62.5/125 dan 8.3/125 Jumlah core di dalam satu kabel bisa antara 4 s.d. 144
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Klasifikasi Serat Optik 18
Berdasarkan mode gelombang cahaya yang berpropagasi pada serat optik
Multimode Fibre
Singlemode Fibre
Berdasarkan perubahan indeks bias bahan
Step index fibre
Gradded index fibre
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Tipe konstruksi FO 1.
Loose Tube Cable
2. Tight buffered cable
Jenis konektor Fober Optik
1.
SMA konektor
.
3.
ST Konektor
4.
FC konektor
Jenis Serat Optik 1.
Single Mode
2.
Multi Mode
JARINGAN LOKAL AKSES FIBER Jarlokaf adalah jaringan akses yang menggunakan secara bersama suatu antarmuka jaringan dan di implementsikan menggunakan serat optik. 1. 2. 3. 4.
FTTC (Fiber To The Crub) FTTB ( Fiber To The Building) FTTH (Fiber To The Home) FTTT (Fiber To The Tower)
Arsitektur dan topologi FTTx
PENYAMBUNGAN SERAT OPTIK Peleburan (Fusion Splice ) Penyambungan dilakukan dengan menyolder ujung-ujung kedua serat optik yang disesuaikan posisinya. 2. Penyambungan Mekanis Penyambungan mekanis menggunakan elemen biasa dan teknik ini diterapkan di lapangan. 1.
PEMBAHASAN 1 Fiber To The Home (FTTH) Fiber To The Home merupakan suatu format penghantaran isyarat optis dari pusat penyedia (Provider) ke kawasan pengguna dengan menggunakan
