Reduction of leakage effect with circulator-free fiber-gratings codec array in OCDMA network |
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Authors: | Cheng-Mu Tsai Jen-Fa Huang |
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Affiliation: | aDepartment of Computer and Communication, Kun Shan University, No. 949, Da Wan Rd., Yung-Kang City, Tainan Hsien 710, Taiwan;bInstitute of Computer and Communications, Department of Electrical Engineering, National Cheng Kung University, Taiwan |
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Abstract: | The spectral-amplitude-coding (SAC) optical code-division multiple-access (OCDMA) systems use transmissive-mode fiber-Bragg gratings (FBG) instead of reflective-mode to avoid chip-timing. However, practical FBGs have non-ideal reflection coefficients to produce leakage effect and high phase-induced intensity noise (PIIN). This study is to cascade more of the same-frequency non-ideal FBGs to approach an ideal squared perfect spectrum for highly reliable network coding. A simple experiment is demonstrated to verify the square-like approach. Moreover, a residual-spectra eliminator (RSE) between FBG encoder and decoder is taken to remove non-coding part of the transmissive spectra for the suppression of PIIN in the receiver photo-detectors. Evaluation results show that the combination of RSE with cascaded FBGs can significantly improve the leakage and the PIIN effects for the SAC–OCDMA network. |
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Keywords: | Optical code-division multiple-access (OCDMA) Spectral-amplitude-coding (SAC) Fiber-Bragg grating (FBG) Phase-induced intensity noise (PIIN) Multiple-access interference (MAI) |
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