Download Book - Optical Fiber Communications Principles By Jhon M Senior
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Book Name - Optical Fiber Communications Principles and practise
Book Author Name - Jhon M SeniorBook Page - 1127
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Book edition - Third
Book Size - 13 MB
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Description of Book - Optical Fiber Communications Principles
Page 8:
Contents
Preface xix
Acknowledgements xxiii
List of symbols and abbreviations xxxii
Chapter 1: Introduction 1
1.1 Historical development 1
1.2 The general system 5
1.3 Advantages of optical fiber communication 7
References 10
Chapter 2: Optical fiber waveguides 12
2.1 Introduction 12
2.2 Ray theory transmission 14
2.2.1 Total internal reflection 14
2.2.2 Acceptance angle 16
2.2.3 Numerical aperture 17
2.2.4 Skew rays 20
2.3 Electromagnetic mode theory for optical propagation 24
2.3.1 Electromagnetic waves 24
2.3.2 Modes in a planar guide 26
2.3.3 Phase and group velocity 28
2.3.4 Phase shift with total internal reflection and the
evanescent field 30
2.3.5 Goos–Haenchen shift 35
Page 58:
1.3 Advantages of optical fiber communication
Communication using an optical carrier wave guided along a glass fiber has a number of
extremely attractive features, several of which were apparent when the technique was
originally conceived. Furthermore, the advances in the technology to date have surpassed
even the most optimistic predictions, creating additional advantages. Hence it is useful
to consider the merits and special features offered by optical fiber communications over
more conventional electrical communications. In this context we commence with the
originally foreseen advantages and then consider additional features which have become
apparent as the technology has been developed.
(a) Enormous potential bandwidth. The optical carrier frequency in the range 1013 to
1016 Hz (generally in the near infrared around 1014 Hz or 105 GHz) yields a far greater
potential transmission bandwidth than metallic cable systems (i.e. coaxial cable bandwidth
typically around 20 MHz over distances up to a maximum of 10 km) or even millimeter
wave radio systems (i.e. systems currently operating with modulation bandwidths of
700 MHz over a few hundreds of meters). Indeed, by the year 2000 the typical bandwidth
multiplied by length product for an optical fiber link incorporating fiber amplifiers (see
Section 10.4) was 5000 GHz km in comparison with the typical bandwidth–length product
for coaxial cable of around 100 MHz km. Hence at this time optical fiber was already
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