Principi | Telekomunikacija Miroslav Dukic Pdf 18

Overview of the Book

Title: Principi telekomunikacija Author: Prof. Dr. Miroslav Dukić Field: Telecommunications / Electrical Engineering

Principi Telekomunikacija Miroslav Dukić PDF 18: A Complete Guide to the Classic Telecom Textbook

Principi Telekomunikacija by Miroslav Dukić – A Cornerstone Textbook for Telecommunications Engineering

2. Dispersion in Optical Fibers (Chapter 18 – on fiber optics)

If your “18” refers to Chapter 18, the centerpiece is chromatic dispersion. Dukić explains that different wavelengths travel at slightly different speeds in silica glass. This causes pulse broadening, which limits the bit rate–distance product.

Key formula from Dukić’s Chapter 18:

[ \Delta T_\textchrom = D \cdot L \cdot \Delta \lambda ]

Where:

• ( \Delta T_\textchrom ) = pulse spread (seconds)
• ( D ) = dispersion parameter (ps/(nm·km))
• ( L ) = fiber length (km)
• ( \Delta \lambda ) = spectral width of the source (nm)

For standard single-mode fiber at 1550 nm, ( D \approx 17 ) ps/(nm·km). If your laser has ( \Delta \lambda = 0.1 ) nm and length ( L = 100 ) km, the spread is 170 ps. For a 10 Gb/s system (bit period = 100 ps), this spread would cause intersymbol interference unless compensated. principi telekomunikacija miroslav dukic pdf 18

Dukić then introduces dispersion-shifted fibers and dispersion compensation modules (DCMs). These practical sections explain why telecom engineers use specific fiber types for different network segments (metro vs. long-haul).

Overview of the Book’s Content

The book is typically divided into thematic units covering the entire spectrum of basic telecommunications principles:

1. Introduction to Telecommunication Systems

   • Historical development
   • Block diagrams of communication systems
   • Information theory basics

2. Signals and Systems in Telecommunications

   • Time and frequency domain representation
   • Fourier series and transform
   • Linear systems and filtering

3. Amplitude Modulation (AM)

   • Double-sideband suppressed carrier (DSB-SC)
   • Conventional AM
   • Single-sideband (SSB) and vestigial-sideband (VSB)

4. Angle Modulation

   • Frequency modulation (FM)
   • Phase modulation (PM)
   • Bandwidth considerations (Carson’s rule)

5. Digital Communication Principles

   • Sampling theorem
   • Pulse-code modulation (PCM)
   • Delta modulation
   • Baseband digital transmission (NRZ, RZ, Manchester coding)

6. Digital Modulation Techniques

   • ASK, FSK, PSK, QAM
   • Constellation diagrams
   • Error probability analysis

7. Noise and Performance

   • Thermal noise, shot noise
   • Signal-to-noise ratio (SNR)
   • Noise figure and temperature

8. Multiplexing and Multiple Access

   • FDM, TDM, WDM
   • FDMA, TDMA, CDMA basics

9. Transmission Media

   • Twisted pair, coaxial cable, optical fiber, free-space optics
   • Attenuation, dispersion, and bandwidth characteristics

10. Introduction to Modern Systems

    • GSM, Bluetooth, Wi-Fi, satellite communications (depending on edition)

Why Is Chapter 18 Important?

Optical fiber transmission is the backbone of modern long-distance and metro networks. Chapter 18 of Dukić’s book introduces:

• Structure of optical fibers – Core, cladding, coating. Single-mode vs. multimode fibers.
• Refraction and total internal reflection – Snell’s law applied to cylindrical waveguides.
• Numerical aperture – How much light can be captured.
• Attenuation mechanisms – Absorption, Rayleigh scattering, bending losses. Typical loss plots (850 nm, 1310 nm, 1550 nm windows).
• Dispersion – Modal dispersion (in multimode fibers), chromatic dispersion, polarization mode dispersion.
• Optical sources – LEDs vs. laser diodes.
• Photodetectors – PIN and APD diodes.
• Optical amplifiers – EDFA (Erbium-doped fiber amplifiers).

If you are searching for page 18 of a PDF, that likely falls into the first or second chapter, which covers fundamental signals and systems – specifically:

• Periodic and aperiodic signals.
• Unit step and impulse functions.
• Basic Fourier series representation.
• Decibels and power measurements.

In many editions, page 18 contains the first problems or a worked example on calculating signal energy and power. It is a critical section for students trying to master signal analysis before moving to modulation. ( \Delta T_\textchrom ) = pulse spread (seconds)