© 2005

Phase-Modulated Optical Communication Systems


Table of contents

About this book


Fiber-optic communication systems have revolutionized our telecommunication infrastructures – currently, almost all telephone land-line, cellular, and internet communications must travel via some form of optical fibers. In these transmission systems, neither the phase nor frequency of the optical signal carries information – only the intensity of the signal is used. To transmit more information in a single optical carrier, the phase of the optical carrier must be explored.

As a result, there is renewed interest in phase-modulated optical communications, mainly in direct-detection DPSK signals for long-haul optical communication systems. When optical amplifiers are used to maintain certain signal level among the fiber link, the system is limited by amplifier noises and fiber nonlinearities. Phase-Modulated Optical Communication Systems surveys this newly popular area, covering the following topics:

The transmitter and receiver for phase-modulated coherent lightwave systems

Method for performance analysis of phase-modulated optical signals

Direct-detection DPSK signal with fiber nonlinearities, degraded by nonlinear phase noise and intrachannel effects

Wavelength-division-multiplexed direct-detection DPSK signals

Multi-level phase-modulated optical signals, such as the four-phase DQPSK signal

Graduate students, professional engineers, and researchers will all benefit from this updated treatment of an important topic in the optical communications field.


DPSK Fiber nonlinearities Modulation Soliton Transmission interferometric detection lightwave systems phase-shift keying

Authors and affiliations

  1. 1.Institute of Communication Engineering and Department of Electrical EngineeringNational Taiwan UniversityTaiwan

About the authors

Keang-Po Ho is currently with National Taiwan University.  He was the cofounder and CTO of StrataLight Communications.  His research interests are the system issues of high-speed optical communications, and he has authored more than 150 technical publications. 

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