Abstract
Feature Issue on
Optical Access Networks (OAN)
We propose a
spectral-amplitude-encoding optical-code-division-multiplexing (SAE∕OCDM) system
with a heterodyne detection receiver for broadband optical multiple-access networks
(OMANs). The performance of the proposed system is theoretically analyzed, taking
into account various types of noise and interference, including multiple-access
interference (MAI), cross talk, optical beating interference (OBI), and receiver
noise. Analytical results show that the proposed system offers significant
improvement in terms of receiver sensitivity and system capacity (number of users)
compared with conventional direct-detection systems. We also discuss conditions
necessary for a heterodyne detection receiver to work properly in a SAE∕OCDM system.
In addition, the system performance is analyzed with several signature code sets
including m-sequence, Hadamard, and modified quadratic congruence (MQC) code sets.
It is found that signature code sets with higher weight, such as m-sequence and
Hadamard code sets, are preferred in a SAE∕OCDM system with a heterodyne detection
receiver.
© 2005 Optical Society of America
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