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The giga-passive optical network (GPON) systems use spectral amplitude coding-optical code division multiple access (SAC-OCDMA) to enhance user security. However, this technique has shortcomings. Expanding user capacity requires extra components or channels, which increases system complexity. These networks also use broadband spectrum sources to maintain acceptable performance. This paper addresses these challenges. It presents a robust fiber-to-the-building gigabit passive optical network (FTTB-GPON). The network uses the Identity Row-Shifting Matrix (IRSM) SAC-OCDMA code scheme and four narrow-band, directly modulated vertical-cavity surface-emitting laser (VCSEL) sources, which are distributed across four channels to serve 16 buildings. The network is evaluated under this configuration. It is tested with (1490.05/1310.05) nm downlink/uplink (DL/UL), 0.6 nm channel spacing, and 0.15 nm bandwidth over a 20 km fiber optic backbone at 2.5 Gbps. The results showed that this scenario achieved an acceptable bit error rate (BER) and Q-factor. The network demonstrated a BER of −13.6 dB and a Q-factor of approximately 7.53.

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Design a Robust FTTB-GPON-Based Directly Modulated VCSEL Sources Using an Identity Row Shifting Matrix Coding Scheme

  • 会议论文

  • 发表日期：

    2026年

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  • Sura Khalil Ibrahim,
  • Ghusoon M. Ali,
  • Ali Khalid Jassim

摘要

The giga-passive optical network (GPON) systems use spectral amplitude coding-optical code division multiple access (SAC-OCDMA) to enhance user security. However, this technique has shortcomings. Expanding user capacity requires extra components or channels, which increases system complexity. These networks also use broadband spectrum sources to maintain acceptable performance. This paper addresses these challenges. It presents a robust fiber-to-the-building gigabit passive optical network (FTTB-GPON). The network uses the Identity Row-Shifting Matrix (IRSM) SAC-OCDMA code scheme and four narrow-band, directly modulated vertical-cavity surface-emitting laser (VCSEL) sources, which are distributed across four channels to serve 16 buildings. The network is evaluated under this configuration. It is tested with (1490.05/1310.05) nm downlink/uplink (DL/UL), 0.6 nm channel spacing, and 0.15 nm bandwidth over a 20 km fiber optic backbone at 2.5 Gbps. The results showed that this scenario achieved an acceptable bit error rate (BER) and Q-factor. The network demonstrated a BER of −13.6 dB and a Q-factor of approximately 7.53.