Abstract
Orthogonal frequency division multiplexing (OFDM) is a modulation technique
which is now used in most new and emerging broadband wired and wireless communication
systems because it is an effective solution to intersymbol interference caused
by a dispersive channel. Very recently a number of researchers have shown
that OFDM is also a promising technology for optical communications. This
paper gives a tutorial overview of OFDM highlighting the aspects that are
likely to be important in optical applications. To achieve good performance
in optical systems OFDM must be adapted in various ways. The constraints imposed
by single mode optical fiber, multimode optical fiber and optical wireless
are discussed and the new forms of optical OFDM which have been developed
are outlined. The main drawbacks of OFDM are its high peak to average power
ratio and its sensitivity to phase noise and frequency offset. The impairments
that these cause are described and their implications for optical systems
discussed.
© 2009 IEEE
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