ISSN : 1796-2021
Volume : 3    Issue : 1    Date : January 2008

New Receiver Architecture Based on Optical Parallel Interference Cancellation for the Optical CDMA
N.Elfadel, A.A.Aziz, E.Idriss, A.Mohammed, and N.M.Saad
Page(s): 64-70
Full Text:
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Optical Code Division Multiple Access (OCDMA) is considered as the strongest candidates for the
future high speed optical networks due to the large bandwidth offered by the system, Based on the vast
amount of bandwidth, OCDMA systems have received much attention in fiber optic Local Area Networks
where the traffic is typically bursty. However, Multiple Access Interference (MAI), which is originated from
other simultaneous users, severely limits the capacity of the system. Optical Parallel Interference
Cancellation (OPIC) has been used to reduce the effect of MAI. However, the usage of OPIC in OCDMA
systems will increase the demand for hardware complexity which results in higher processing time
and cost. The hardware complexity increases in the receiver side of OPIC when the number of
transmitter (users) increases. To overcome these difficulties, an efficient method is presented in this  
paper called, One Stage Optical Parallel Interference Cancellation (OS-OPIC) which is based mainly on
the OPIC. Optical Orthogonal Code (OOC) is adopted as a signature sequence for the performance
analysis and a new expression for the error probability is derived. It is shown that, the proposed
method is effective to reduce the hardware complexity, processing time and cost while maintaining the
same bit error probability at the cost of increasing threshold value.

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