A Flexible Optical CDMA System Using Optical Orthogonal Codes with Unequal Weights

概要

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An optical orthogonal code (OOC) is one of attractive research topics for fully optical CDMA systems. Well-known OOCs are time-spreading type codes, while recent OOCs include frequency-spreading type codes that can be generated by innovative FBG encoder technologies. In this paper, frequency-spreading type OOCs with unequal weights to solve a near-far problem in optical CDMA systems have been studied. We have proposed that partial codes of MQC are used as the unequal-weight codes. BER performance is derived by a Gaussian approximation technique. The capacity of the CDMA system is also obtained. The results show that the proposed OOCs can provide flexible performance even when user's received power ratio becomes large.
2005-05-20