Phase-Modulated Optical Communication Systems

Covers topics such as: the transmitter and receiver for phase-modulated coherent lightwave systems; method for performance analysis of phase-modulated optical signals; and direct-detection DPSK signal with fiber nonlinearities, degraded by nonlinear phase noise effects. This work is useful for graduate students, engineers, and researchers.

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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.