Phase-Modulated Optical Communication Systems

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.

Auteur
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.

Contenu
Digital Modulation of Optical Carrier.- Coherent Optical Receivers and Ideal Performance.- Impairment to Optical Signal.- Nonlinear Phase Noise.- Compensation of Nonlinear Phase Noise.- Intrachannel Pulse-to-Pulse Interaction.- Wavelength-Division-Multiplexed DPSK Signals.- Multilevel Signaling.- Phase-Modulated Soliton Signals.- Capacity of Optical Channels.