Fiber-optic communication systems have revolutionized our
telecommunication infrastructures a" 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 a" 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.
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