Abstract
Like its wireless counterpart, optical code-division multiple access
(optical CDMA) offers greater scalability than other optical multiplexing
schemes and provides flexible quality of service, physical layer privacy and
asynchronous access .
However, unlike wireless CDMA, high bit-rate optical CDMA networks use much
higher bandwidth, which cannot be effectively processed with modern electronics
rendering many earlier developed detection schemes inapplicable. In this paper
we show both theoretically and experimentally that conventional electronics-based
detection is inefficient in optical CDMA networks and limits the total network
throughput by the bandwidth of the photodetector used. As a solution, we show
that network performance can be greatly improved using ultrafast all-optical
signal processing for signal detection. Recently developed all-optical thresholding
devices performing cubic transformation allow for more than seven times increase
in throughput for typical network parameters. A comprehensive comparison of
different detection methods for optical CDMA including optimized electronics-based
and all-optical signal processing-based is given for the first time.
© 2009 IEEE
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