Abstract
We propose a new family of one-dimensional (1D) active weight two-code keying (TCK) in spectral amplitude coding (SAC) optical code division multiple access (OCDMA) networks. We use encoding and decoding transfer functions to operate the 1D active weight TCK. The proposed structure includes an optical line terminal (OLT) and optical network units (ONUs) to produce the encoding and decoding codes of the proposed OLT and ONUs, respectively. The proposed ONU uses the modified cross-correlation to remove interferences from other simultaneous users, that is, the multiuser interference (MUI). When the phase-induced intensity noise (PIIN) is the most important noise, the modified cross-correlation suppresses the PIIN. In the numerical results, we find that the bit error rate (BER) for the proposed system using the 1D active weight TCK codes outperforms that for two other systems using the 1D M-Seq codes and 1D balanced incomplete block design (BIBD) codes. The effective source power for the proposed system can achieve −10 dBm, which has less power than that for the other systems.
Highlights
Optical code division multiple access (OCDMA) systems are used in various network applications and their performance has become crucial [1,2,3,4]
We propose a new family of one-dimensional (1D) active weight two-code keying (TCK) in spectral amplitude coding (SAC) optical code division multiple access (OCDMA) networks
We find that the bit error rate (BER) for the proposed system using the 1D active weight TCK codes outperforms that for two other systems using the 1D M-Seq codes and 1D balanced incomplete block design (BIBD) codes
Summary
Optical code division multiple access (OCDMA) systems are used in various network applications and their performance has become crucial [1,2,3,4]. We propose one-dimensional (1D) active weight TCK codes for use in spectral amplitude coding (SAC) OCDMA networks. The proposed codes use the derived code sequences to operate the decoding transfer function, which produces a modified cross-correlation. The comparison between and 1D active weight TCK codes and 1D MDW codes with the OCK is dependent on the cross-correlation. The level of the cross-correlation in the receiver in the 1D active weight TCK codes shows better performance than that in the 1D MDW. When the code sequences CM,O,m and CM,O+1,m are assigned to the same user for two-code keying, we use a MUI elimination scheme to solve the problem of interference from other simultaneous users using the modified cross-correlation. Use the modified cross-correlation to remove MUI and suppress the PIIN
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