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Spie Press Book

Optical Communication Receiver Design
Author(s): Stephen B. Alexander
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Book Description

Copublished with IEE. This Tutorial Text provides an overview of design principles for receivers used in optical communication systems, intended for practicing engineers. The author reviews technologies used to construct optical links and illustrates the flow of system performance specifications into receiver requirements. Photodetector fundamentals, associated statistics, characteristics and performance issues are presented, together with a tutorial on noise analysis and the specific techniques needed to model optical receivers.

Book Details

Date Published: 1 January 1997
Pages: 340
ISBN: 9780819420237
Volume: TT22

Table of Contents
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Preface ix
Acknowledgments xi
Glossary xiii
1 Optical Communications
1.1 Introduction
1.2 Fiber-Optic Systems
1.2.1 Optical Fiber
1.2.2 Fiber Coupling Considerations
1.3 Free-Space Systems
1.3.1 Choice of Laser Technology
1.3.2 Spatial Pointing and Tracking Considerations
1.4 References
2 System Performance
2.1 Analog and Digital Optical Communications
2.2 The Link Budget
2.2.1 Link Budget for the Fiber-Optic Channel
2.2.2 Link Budget for the Free-Space Channel
2.3 Specifying an Analog Receiver's Performance
2.4 Specifying a Digital Receiver's Performance
2.5 The Receiver Sensitivity Budget
2.6 References
3 Photodetection
3.1 The Detection of Optical Signals
3.2 Photon Counting
3.3 Modeling Photodetection
3.4 Photocurrent Statistics
3.5 Ideal Direct Detection
3.6 Ideal Coherent Detection
3.7 References
4 Photodetectors
4.1 Photomultipliers
4.2 Photoconductors
4.3 The p-n Photodiode
4.4 Metal-Semiconductor Photodiodes
4.5 The p-i-n Photodiode
4.6 The Avalanche Photodiode
4.7 Small Signal Equivalent Circuit Model for a Photodetector
4.8 References
5 Receiver Noise Modeling
5.1 Fundamentals of Noise Analysis
5.2 Noise Sources in an Optical Receiver
5.3 Electronics Noise
5.3.1 Thermal-noise
5.3.2 Electronic Shot-Noise
5.3.3 1/f Noise
5.3.4 Noise Model of an Electronic Amplifier
5.4 Photodetector Dark-Current Noise
5.5 Photodetector Thermal-Noise
5.6 Photoconductor Generation-Recombination Noise
5.7 APD Excess Noise
5.8 Optical Excess-Noise
5.8.1 Laser Intensity-Noise
5.8.2 Modal-Noise
5.8.3 Mode-Partition-Noise
5.9 Optical Background Noise
5.10 Noise Equivalent Circuit for an Optical Receiver
5.11 Degradation from the Quantum Shot-Noise Limited Noise-Density
5.12 Total Equivalent Noise Power in the Receiver
5.12.1 Broad-Band Systems
5.12.2 Narrow-Band Systems
5.12.3 Base-Band Digital Systems
5.13 Noise Equivalent Power and Detectivity
5.14 References
6 Receiver Front-End Design
6.1 Front-End Architectures
6.1.1 Low Impedance Voltage Amplifier
6.1.2 High-Impedance Amplifier
6.1.3 Transimpedance Amplifier
6.1.4 Noise-Matched or Resonant Amplifiers
6.2 Amplifier Circuit Design
6.2.1 Bipolar Transistor Amplifiers
6.2.2 FET Amplifiers
6.2.3 Transimpedance of a Single-Stage Amplifier
6.3 Multistage Amplifiers
6.4 References
7 Receiver Performance Analysis
7.1 Digital Demodulation
7.1.1 Digital Signaling Formats
7.2 Direct Detection Digital Receivers
7.2.1 Ideal Photon Counting On-Off Keying
7.2.2Receiver Noise, Pulse Shaping Filters, and the Eye Diagram
7.2.3 OOK with a p-i-n Photodetector Front-End
7.2.4 OOK with an APD Front-End
7.3 Coherent Detection Digital Receivers
7.3.1 Modulation Formats and Demodulators for Coherent Receivers
7.3.2 Linewidth Effects
7.4 Optically Preamplified Digital Receivers
7.4.1 ASK or OOK with an Optically Preamplified Receiver
7.4.2 Preamplified Receivers for FSK and DPSK
7.5 Clock Recovery
7.6 Analog Receivers
7.7 Reported Receiver Sensitivities
7.8 References
Index

Preface

We are surrounded by an ongoing revolution in optical communication. Fiber-optic networks carrying gigabits per second span oceans and continents, and devices such as optical amplifiers, which were once regarded only as laboratory curiosities, are now commonplace. The vast capacity of optical communication systems has enabled the development of information infrastructures of both national and global extent. Optical communication techniques are not restricted to fiber-optics. Free-space optical communication offers the possibility of high-data-rate links among satellites and the Earth, allowing even greater flexibility in terms of network connectivity and access.

This text provides an overview of the design principles for receivers used in optical communication systems. The technology and techniques that are discussed are similar to those used in conventional microwave communication receivers; however, there are also significant differences because of the unique characteristics of the photodetection process. The text grew out of the notes for a short course in receiver design. The level of the material is targeted at the practicing engineer and the text contains some 500 references to provide a reader with pointers to the wide variety of work that is available in the open literature.

The material is organized into seven chapters, with Chapter 1 providing a brief review of the technologies used to construct optical communication links. Following the technology introduction, Chapter 2 illustrates the flow of system performance specifications into receiver requirements and is illustrated by the use of system link and receiver sensitivity budgets. Chapter 3 introduces the fundamentals of photodetection and the associated statistics. Semi-classical techniques are used, with appropriate references to quantum mechanical considerations as needed. The signal-to-noise ratio for both direct and coherent detection receivers is derived and the concept of a shot-noise-limited receiver is introduced. The characteristics and performance of photodetectors are reviewed in Chapter 4. The p-i-n, avalanche photodiode, and metal-semiconductor-metal photodetectors are covered in detail and a series of equivalent circuit models are developed so that the impact of device characteristics on achievable receiver performance can be determined.

The circuit analysis techniques used with electrical noise are omitted in many engineering curricula, and Chapter 5 provides a quick tutorial on the general subject of noise analysis and also serves to describe the specific analysis techniques needed to model optical receivers. In particular, we illustrate the concept of an equivalent input current-noise model for the receiver. Chapter 6 reviews the design of the receiver front end, covering the resistor terminated voltage amplifier, high-impedance amplifier, and transimpedance amplifier. Chapter 7 concludes the text with examples of receiver performance analysis. Direct detection, coherent detection, and optically preamplified receivers are discussed, as well as analog systems. Particular attention is given to the detection statistics associated with the various photodetectors and receiver structures.


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