The deployment of high-order modulation formats in optical fiber
transmission systems is presently seen as a promising way of
increasing spectral efficiency and of making better use of the
capacity of currently existing fiber infrastructure. Catering to
this interest, this book presents possible ways of generating and
detecting optical signals with high-order phase and quadrature
amplitude modulation and characterizes their system and
transmission properties.
Several implementation options for high-order modulation optical
transmitters are possible. Their optical and electrical parts are
described and their individual signal properties are discussed.
Receiver concepts with direct detection, homodyne differential
detection and homodyne synchronous detection are illustrated,
starting with optical frontends and ending with concrete data
recovery. The description of transmitters and receivers provided in
the first part of the book not only helps to demonstrate their
functioning, but also allows their complexity and practicability to
be estimated and compared.
To advance understanding of the system and transmission behavior
of high-order modulation formats for optical fiber transmission,
various system parameters such as noise performances, optimal
receiver filter bandwidths, required laser linewidths and the
chromatic dispersion and self phase modulation tolerances of a wide
range of modulation formats are highlighted in the second part of
the book, considering different line codes and many transmitter and
receiver configurations. Currently, the determination of attainable
transmission distances for multi-span long-haul transmission using
high-order modulation formats represents an exciting field of
research. Recent results in this area are also covered by this
book.
This monograph is intended for students and researchers in the
field of optical communications, as well as for system designers
who want to learn about the properties and complexity of optical
systems employing high-order modulation.
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