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Noncoherent spectral optical code division multiple access system using one-dimensional added length codes
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DOI：10.1007/s11082-016-0672-1.png)
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Abstract
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This work proposes a new family of 1-D added length codes for use in spectral amplitude coding optical code division multiple access (OCDMA) networks. The proposed structure uses the proposed optical line terminal (OLT) and optical network units (ONUs) to produce a simple architecture for ease of operation. The OLT transfers the information bits into the code sequences of 1-D added length codes in OCDMA. The ONUs use the code sequences of the 1-D added length codes to perform a modified cross-correlation, which produces the recovered 1 and 0 bits at the photodiodes. The photodiodes remove the interference caused by other simultaneous users, which is called multi-user interference. Additionally, the proposed modified cross-correlation process suppresses the phase-induced intensity noise. The numerical results demonstrate the bit error rate of the proposed system using 1-D added length codes to be better than that of other comparable systems using 1-D M-sequence codes, 1-D composite M-sequence codes, 1-D Hadamard codes, and 1-D MQC codes. The data transmission rate using the 1-D added length codes can reach 2.5 Gbps.
Keywords:
Optical code division multiple access
Optical line terminal
Optical network units
Multi-user interference
Phase-induced intensity noise
Photodiode
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